{"id":43709,"date":"2022-05-31T03:59:51","date_gmt":"2022-05-31T03:59:51","guid":{"rendered":"https:\/\/www.takomabattery.com\/?p=43709"},"modified":"2023-12-02T08:04:40","modified_gmt":"2023-12-02T08:04:40","slug":"lithium-sulfur-batteries","status":"publish","type":"post","link":"https:\/\/www.takomabattery.com\/es\/lithium-sulfur-batteries\/","title":{"rendered":"La polimerizaci\u00f3n electroqu\u00edmica realiza la carga r\u00e1pida a 10C de las bater\u00edas de litio-azufre"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"43709\" class=\"elementor elementor-43709\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b313387 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b313387\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-81e02a7\" data-id=\"81e02a7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-da8823d elementor-widget elementor-widget-woocommerce-breadcrumb\" data-id=\"da8823d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"woocommerce-breadcrumb.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<nav class=\"woocommerce-breadcrumb\" aria-label=\"Breadcrumb\">Inicio<\/nav>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ed733c elementor-widget elementor-widget-heading\" data-id=\"3ed733c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Electrochemical polymerization realizes 10C fast charging of lithium sulfur batteries<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f2cc7d2 elementor-widget elementor-widget-text-editor\" data-id=\"f2cc7d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div style=\"line-height: 40px\"><p>When we all know <a href=\"https:\/\/www.takomabattery.com\/the-ultimate-energy-source-high-voltage-battery\/\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline\"><span style=\"color: #333399;text-decoration: underline\">which battery has the most voltage<\/span><\/span><\/a>, now we also find<strong> lithium sulfur batteries<\/strong> have attracted extensive attention due to their high theoretical energy density and abundant sulfur resources. The sulfide thermal depolymerization (acrylonitrile) (S@pPA) cathode can eliminate the shuttle effect due to the solid-solid transformation mechanism, but suffer from poor electrolyte\/electrode interface and sluggish kinetics in carbonate electrolytes.<\/p><p>A non-flammable polyether electrolyte for lithium sulfur batteries@pPAN was formed by in-situ electrochemical polymerization, achieving super-stable performance of lithium sulfur batteries 10C super fast charge and 4C400-cycle average Coulomb efficiency of 99.9995% for lithium sulfur batteries.<\/p><\/div><div>\u00a0<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e31bb2 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"4e31bb2\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;exclude_headings_by_selector&quot;:&quot;.paichu_post&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<div class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__4e31bb2\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__4e31bb2\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__4e31bb2\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4d73528 uael-aspect-ratio-16_9 uael-youtube-subscribe-no elementor-widget elementor-widget-uael-video\" data-id=\"4d73528\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"uael-video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"uael-video__outer-wrap  uael-video-type-youtube\" data-device=\"false\" data-vsticky=\"no\" data-hidedesktop=\"\" data-hidetablet=\"\" data-hidemobile=\"\" data-vsticky-viewport=\"0\" data-autoplay=\"0\">\n\t\t\t\t\t\t<div class=\"uael-video-inner-wrap\">\n\t\t\t\t<div class=\"uael-video__play\" data-src=\"https:\/\/www.youtube.com\/embed\/C0Uyf1SrWsY?rel=0&amp;start&amp;end&amp;controls=1&amp;mute=0&amp;modestbranding=0&amp;autoplay=1\">\n\t\t\t\t\t<img decoding=\"async\" class=\"uael-video__thumb\" src=\"https:\/\/i.ytimg.com\/vi\/C0Uyf1SrWsY\/hqdefault.jpg\" alt=\"\"><\/img>\n\t\t\t\t\t<div class=\"uael-video__play-icon uael-animation-\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2023\/07\/YouTube_play_button_icon_2013\u20132017.svg-21.webp\" alt=\"youtube play button\" \/>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-086a1b3 elementor-widget elementor-widget-text-editor\" data-id=\"086a1b3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div style=\"line-height: 40px\"><h2 id=\"Introduction_of_lithium_sulfur_batteries\">Introduction of lithium sulfur batteries<\/h2><p>lithium sulfur batteries are considered to be a promising next-generation energy storage system due to their high theoretical energy density (2600 Whkg-1) and abundant sulfur resources. Over the past few decades, many studies involving all components of lithium sulfur batteries have been reported.<\/p><p>The electrolyte plays an important role as a bridge between the anode and the cathode and has a crucial impact on the lithium sulfur batteries performance. Since lithium polysulfides (LiPS) tend to attack and destroy carbonate electrolytes, ether-based electrolytes are often employed in lithium sulfur batteries batteries to match common S@C composite cathodes with a solid-liquid dissolution-deposition mechanism.<br \/><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-43718\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrolyte-plays-an-important-role-as-a-bridge-between-anode-and-cathode.jpg\" alt=\"Electrolyte plays an important role as a bridge between anode and cathode\" width=\"1000\" height=\"1159\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrolyte-plays-an-important-role-as-a-bridge-between-anode-and-cathode.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrolyte-plays-an-important-role-as-a-bridge-between-anode-and-cathode-259x300.jpg 259w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrolyte-plays-an-important-role-as-a-bridge-between-anode-and-cathode-884x1024.jpg 884w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrolyte-plays-an-important-role-as-a-bridge-between-anode-and-cathode-768x890.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrolyte-plays-an-important-role-as-a-bridge-between-anode-and-cathode-600x695.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>The mechanism involves the inevitable dissolution of LiPS to achieve sulfur reduction. However, the dissolution behavior in ether electrolytes exhibits a typical shuttling phenomenon, limiting battery performance such as sulfur utilization, cycling stability, and CE.<\/p><p>Furthermore, the solid-liquid dissolution-deposition mechanism severely limits the fabrication of low-porosity and dense cathodes for future high-volume energy density batteries.<\/p><p>In early 2002, sulfide thermal depolymerization (acrylonitrile) (S@pPAN) was reported to have a unique solid-solid transformation mechanism in carbonate electrolytes. Unlike S@C cathodes, carbonate electrolytes are usually employed to form a protective cathode electrolyte interface (CEI) on the cathode surface, thereby eliminating the dissolution and shuttling of LiPS.<\/p><p>The quality of the CEI layer, including composition, thickness, and mechanical strength, is critical to battery performance. However, in conventional carbonate electrolytes, CEIs composed of polycarbonate show increased thickness and large interfacial impedance. Meanwhile, the unstable cathode interface continuously consumes Li, resulting in insufficient CE of the S@pPAN cathode, which is a key factor to achieve long lifetime under practical conditions.<\/p><p>In addition, a similar dilemma exists for lithium metal anodes using conventional carbonate electrolytes. It is well known that ether-based electrolytes tend to form thinner elastic interfacial layers with lower polarization compared to carbonate electrolytes.<\/p><p>However, due to high solubility, LiPS dissolution occurs in common ether-based electrolytes. Therefore, designing electrolytes for long-life lithium sulfur batteries@pPAN batteries remains challenging, as shown in Figure.<\/p><p>An ideal electrolyte requires the following properties: (1) a thin and stable interface with high Li+ conductivity on Li anode and sulfur-based cathode, and (2) low or no solubility for LiPS, especially when screening ether solvents , (3) non-flammable and intrinsically safe high boiling point.<\/p><p style=\"text-align: center\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-43721\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Schematic-comparison-of-electrolytes-for-lithium-sulfur-batteries.jpg\" alt=\"Schematic comparison of electrolytes for lithium sulfur batteries\" width=\"1000\" height=\"1114\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Schematic-comparison-of-electrolytes-for-lithium-sulfur-batteries.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Schematic-comparison-of-electrolytes-for-lithium-sulfur-batteries-269x300.jpg 269w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Schematic-comparison-of-electrolytes-for-lithium-sulfur-batteries-919x1024.jpg 919w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Schematic-comparison-of-electrolytes-for-lithium-sulfur-batteries-768x856.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Schematic-comparison-of-electrolytes-for-lithium-sulfur-batteries-600x668.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><br \/>Schematic comparison of electrolytes for lithium sulfur batteries<\/p><p>(a)Schematic illustration of the design dilemma of sulfur-based cathode electrolytes. (b) The superiority of the proposed electrolyte for both electrodes.<\/p><p>Compared with the large-impedance polycarbonate CEI that constrains S@pPAN kinetics, polyether electrolytes are promising alternatives for lithium sulfur batteries@pPAN batteries,<br \/>Among them, the polyether-rich interface can significantly promote Li+ diffusion, which is benefited from the advantages of ethers for Li anodes. Furthermore, the low LiPS solubility of the polymer is likely to still maintain the unique solid-solid transformation mechanism of S@pPAN.<\/p><p>Furthermore, in-situ polymerization is beneficial to effectively improve the electrode\/electrolyte interface, where the initial liquid monomer can accommodate volume changes and ensure tight interfacial contact.<\/p><p>Considering the abundant \u0251-C-H in ether solvents, \u0251-C-H activation is a feasible strategy to form polyether electrolytes in which repeated electron gain\/loss in an electrochemical environment can be used as a catalyst.<\/p><h2 id=\"Fast-charging_lithium_sulfur_batteries\">Fast-charging lithium sulfur batteries<\/h2><p>Dipropylene glycol dimethyl ether (DPGDME), a non-toxic and non-flammable ether solvent, was used in the lithium sulfur batteries@pPAN battery. It undergoes in-situ electrochemical polymerization during cycling, which can effectively alleviate interfacial side reactions and tune the low-polarized interfacial phase, especially on the cathode side.<\/p><p>The unique \u0251-C-H activation mechanism is fully demonstrated through various characterizations and molecular calculations. The intrinsically safe electrolyte exhibits excellent stability for Li anodes for 3000 h and excellent tolerance at high temperature (50 \u00b0C) and large capacity (10 mAh cm-2).<\/p><p>Due to the fast Li+ diffusion of the designed polyether-rich CEI, the lithium sulfur batteries@pPAN battery can achieve a high sulfur utilization rate of 98.4% (1645.3 mAh gS-1) and fast charge performance (lithium sulfur batteries 10C). Furthermore, it provides extremely stable cycling with a capacity retention of 99.5% over 400 cycles and an average CE of over 99.9995%, indicating negligible irreversible lithium consumption.<\/p><p>Furthermore, excellent performance can be achieved even with limited lithium and dilute electrolyte amounts, which is further demonstrated in pouch cells.<\/p><p><img decoding=\"async\" class=\"aligncenter size-full wp-image-43712\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-toxic-and-non-flammable-ether-solven..jpg\" alt=\"Dipropylene glycol dimethyl ether (DPGDME), a non-toxic and non-flammable ether solven.\" width=\"1000\" height=\"981\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-toxic-and-non-flammable-ether-solven..jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-toxic-and-non-flammable-ether-solven.-300x294.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-toxic-and-non-flammable-ether-solven.-768x753.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-toxic-and-non-flammable-ether-solven.-600x589.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><h2 id=\"Research_highlights_of_lithium_sulfur_batteries\">Research highlights of lithium sulfur batteries<\/h2><p>1. Dipropylene glycol dimethyl ether (DPGDME) undergoes in-situ electrochemical polymerization during cycling, which can effectively alleviate interfacial side reactions and tune the low-polarized interfacial phase, especially on the cathode side.<\/p><p>2. The electrolyte exhibits excellent stability for Li anodes for 3000 hours and excellent tolerance at high temperature (50 \u00b0C) and large capacity (10 mAh cm-2).<\/p><p>3.The capacity retention rate is 99.5% over 400 cycles, and the average CE exceeds 99.9995%, indicating negligible irreversible lithium consumption.<\/p><h2 id=\"Electrochemical_polymerization_of_DPGDME-based_electrolytes\">Electrochemical polymerization of DPGDME-based electrolytes<\/h2><p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43715\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-polymerization-of-DPGDME-based-electrolytes.jpg\" alt=\"Electrochemical polymerization of DPGDME-based electrolytes\" width=\"1000\" height=\"784\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-polymerization-of-DPGDME-based-electrolytes.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-polymerization-of-DPGDME-based-electrolytes-300x235.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-polymerization-of-DPGDME-based-electrolytes-768x602.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-polymerization-of-DPGDME-based-electrolytes-600x470.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>Electrochemical polymerization of DPGDME-based electrolytes<\/p><p>(a)Voltage evolution of Li|Li symmetric battery using DPGDME-based electrolyte at 1 mA cm-2\/1 mAh cm-2. (b-d) Characterization of poly-DPGDME: GPC spectrum (b), MALDI mass spectrum (c) and 1HNMR (d). (e) Aggregate evolution of poly-DPGDME. (f) Nyquist plot of Li|Li symmetric cell using DPGDME-based electrolyte.<\/p><p>Dipropylene glycol dimethyl ether (DPGDME), a non-hazardous solvent on the Air Pollution (NAP) list, maintains superior properties compared to solvents commonly used in lithium sulfur batteries, including high boiling point, medium dielectric constant, Low density and viscosity. It maintains excellent chemical stability to lithium even below 100 \u00b0C.<\/p><p>The DPGDME-based electrolyte was first prepared and tested in Li|lithium sulfur batteries to investigate its compatibility with Li anode, as shown in Fig. Even at 1 mAcm-2, it exhibits a remarkably stable curve without increasing overpotential (30 mV) for 2600 h.<\/p><p>The voltage-capacity curve is typically crescent-shaped at the initial cycle, but gradually evolves to a curve that first rises and then flattens, which is similar to that of polyethylene oxide (PEO)-based electrolytes. This particular distribution change may lead to in situ electrochemical polymerization of the electrolyte during cycling.<\/p><p>In addition, the rising point gradually narrowed, indicating an increase in the degree of polymerization. To prove this point, the molecular weight of the electrolyte after cycling was tested by gel permeation chromatography (GPC). It has a high weight-average molecular weight (Mw) close to 3350 g mol-1, which is tens of times that of the DPGDME molecule (162 g mol-1), which provides direct evidence for electrolyte polymerization.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43711\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-hazardous-solvent-on-the-Air-Pollution-NAP-list.jpg\" alt=\"Dipropylene glycol dimethyl ether (DPGDME), a non-hazardous solvent on the Air Pollution (NAP) list\" width=\"1000\" height=\"796\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-hazardous-solvent-on-the-Air-Pollution-NAP-list.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-hazardous-solvent-on-the-Air-Pollution-NAP-list-300x239.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-hazardous-solvent-on-the-Air-Pollution-NAP-list-768x611.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Dipropylene-glycol-dimethyl-ether-DPGDME-a-non-hazardous-solvent-on-the-Air-Pollution-NAP-list-600x478.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>The formed polymer structure (poly-DPGDME) was further investigated by matrix-assisted laser desorption\/ionization time-of-flight mass spectrometry (MALDI-TOF). As shown in Figure 2c, the main distribution has a repeating unit of 146 Da, corresponding to the repeating unit of (-C7H14O3-).<\/p><p>This indicates that one -CH3 and one -H were removed during the polymerization of DPGDME(C8H18O3), respectively. 1H nuclear magnetic resonance (NMR) was then followed to confirm the specific structure of poly-DPGDME.<\/p><p>The 1H of pure DPGDME can be divided into non-\u0251-H (Ha) located at low chemical shift (HLS) and \u0251-H (Hb, Hc, Hd) located at high chemical shift (HHS) with a molar ratio of 1:2.<\/p><p>After polymerization, the proportion of non-\u0251-H at HLS increased, implying that -CH3(d) was removed instead of -CH3(a). The appearance of He Xinfeng further proves this point. The surroundings of the two symmetric -CH3(a) change upon removal of one side -CH3(d), and then one -CH3(a) becomes a new chemical shift of -CH3(e).<\/p><p>At the same time, the peak at HHS disappeared, indicating that one \u0251-H was removed, and the asymmetric -CH3(a)\/-CH3(e) ruled out the possibility of Ha drop from the stationary -CH3(d).<\/p><p>Compared with Hc on methylene, Hb on methine generally shows higher activity and tends to be removed under attack. Peaks do not appear at higher chemical shifts, suggesting that only Hb but not Hc drops. The peak area ratio also confirmed that one side of CH3 (d) and one \u0251-Hb were removed separately during cycling to form poly-DPGDME.<\/p><p>A possible DPGDME polymerization mechanism is proposed, as shown in Fig. In the electrochemical environment, DPGDME is attacked by Li+ and produces single O bond breaking. The generated DPGDME\u2022 radical will attack the methine group, where the active \u0251-H decreases to form di-DPGDME. The dimer loses -CH3 at the same time, eventually forming poly-DPGDME.<\/p><p>Furthermore, molecular calculations provided further evidence and were consistent with the NMR results, where bonds with lower bond dissociation energies (BDEs) tended to break.<\/p><p>Poly-DPGDME maintains a similar molecular structure to PEO, and the abundant single-bond O-C segments in the main and side chains can provide fast Li+ transfer and achieve excellent Li+ conductivity,<br \/>This explains the stable long cycling curve without increasing the overpotential.<\/p><p>Furthermore, as shown, electrochemical impedance spectroscopy (EIS) was further performed. Stable bulk resistance and extremely low interfacial impedance were observed even in the poly-DPGDME electrolyte after 750 h of cycling, indicating the high Li+ conductivity of the electrolyte and the formation of thin favorable interfaces, respectively.<\/p><p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43713\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-characterization.jpg\" alt=\"Electrochemical characterization\" width=\"1000\" height=\"806\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-characterization.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-characterization-300x242.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-characterization-768x619.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-characterization-600x484.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>Electrochemical characterization of 1M LiFSI\/2D1V<\/p><p>(a) Ignition tests of different solvents and electrolytes. (b) Ionic conductivity of different electrolytes. (c,d) Voltage evolution of a Li|Li symmetric cell at 0.5 mA cm-2\/1 mAh cm-2, RT (c), 0.5 mA cm-2\/10 mAhcm-2, 50 \u00b0C (d). (e) SEM of lithium deposition after cycling at 50 \u00b0C for 300 h. (f) FITR spectra of solvent, initial and post-cycling electrolyte.<\/p><p>In addition, vinylene ethylene carbonate (VEC) was selected as the film-forming additive to reasonably modify the electrode interface.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43726\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Vinylene-ethylene-carbonate-VEC-was-selected-as-the-film-forming-additive-to-reasonably-modify-the-electrode-interface..jpg\" alt=\"Vinylene ethylene carbonate (VEC) was selected as the film-forming additive to reasonably modify the electrode interface.\" width=\"1000\" height=\"668\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Vinylene-ethylene-carbonate-VEC-was-selected-as-the-film-forming-additive-to-reasonably-modify-the-electrode-interface..jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Vinylene-ethylene-carbonate-VEC-was-selected-as-the-film-forming-additive-to-reasonably-modify-the-electrode-interface.-300x200.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Vinylene-ethylene-carbonate-VEC-was-selected-as-the-film-forming-additive-to-reasonably-modify-the-electrode-interface.-768x513.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Vinylene-ethylene-carbonate-VEC-was-selected-as-the-film-forming-additive-to-reasonably-modify-the-electrode-interface.-600x401.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>Furthermore, it maintains a high boiling point and non-flammability, and in-situ polymerization initiated by lithium metal can occur during cycling.<\/p><p>All the proposed electrolytes with different volume ratios of DPGDME and VEC (labeled as 1M LiFSI\/nD1V) exhibit low densities and wide electrochemical windows.<\/p><p>To verify safety, a direct ignition test was performed, as shown in Figure. All the proposed solvents and the 1 M LiFSI\/2D1V electrolyte showed non-flammability, while vigorous combustion was observed in the standard carbonate electrolyte containing 10 wt.% fluoroethylene carbonate (STD).<\/p><p>It shows competitive ionic conductivity and excellent chemical stability to lithium even after immersion test at high temperature for 1 week.<\/p><p>The interfacial stability to Li anode was further confirmed by Li|Li battery. All proposed electrolytes exhibit excellent cycling stability at 1600 h without significant overpotential increase compared to the continuous deterioration of STD electrolytes (&lt;900 h). It is worth noting that 1M LiFSI\/1D1V exhibits a larger overpotential because the higher VEC content produces a high-resistance polycarbonate in the SEI.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43724\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI..jpg\" alt=\"The higher VEC content produces a high-resistance polycarbonate in the SEI.\" width=\"1000\" height=\"1000\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI..jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI.-300x300.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI.-150x150.jpg 150w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI.-768x768.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI.-700x700.jpg 700w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI.-600x600.jpg 600w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-higher-VEC-content-produces-a-high-resistance-polycarbonate-in-the-SEI.-100x100.jpg 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>However, the electrolyte with 10 vol.% VEC exhibited poor cycling stability, and the fluctuating voltage profile after 1600 h cycling was attributed to uneven Li deposition and dendrite growth, which was also the case in common ether electrolytes. In contrast, 1M LiFSI\/2D1V provides extremely stable cycling over 3000 hours (125 days), suggesting that the optimized ratio of VECs plays an important role in robust and low-impedance electrode\/electrolyte interface formation.<\/p><p>Furthermore, a special profile change from the intersection was observed during cycling, indicating enhanced polymerization of the two solvents. At higher current densities, 1M LiFSI\/2D1V is further compared with STD electrolytes, showing significant advantages. The elevated temperature can effectively accelerate the ion diffusion and thus reduce the overpotential, while harmful side reactions may be exacerbated, especially between the lithium anode and the electrolyte.<\/p><p>Due to the excellent affinity for lithium, the electrolytes with high content of DDME (2D1V and 9D1V) were further tested at 50 \u00b0C.<\/p><p>Notably, the non-flammability and high boiling points of these two solvents ensure safety even at high temperatures. The proposed electrolyte shows significantly reduced hysteresis within 10 mV.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43723\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-elevated-temperature-can-effectively-accelerate-the-ion-diffusion.jpg\" alt=\"The elevated temperature can effectively accelerate the ion diffusion\" width=\"1000\" height=\"522\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-elevated-temperature-can-effectively-accelerate-the-ion-diffusion.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-elevated-temperature-can-effectively-accelerate-the-ion-diffusion-300x157.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-elevated-temperature-can-effectively-accelerate-the-ion-diffusion-768x401.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-elevated-temperature-can-effectively-accelerate-the-ion-diffusion-600x313.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>Stable cycling over 800 hours was observed indicating fewer side reactions even at elevated temperatures. In addition, the large area capacity (&gt;5 mAh cm-2) is considered as one of the necessary factors for the battery to move towards practical application. The proposed electrolyte exhibits long-term stable cycling over 1000 hours even at a harsh areal capacity of 10 mAh cm-2.<\/p><p>Excellent lifetimes (&gt;400 hours) can also be achieved at higher current densities. Scanning electron microscopy (SEM) observation of the lithium anode interface revealed a thinner polymer film covering the lithium, strikingly showing densification and separation.<\/p><p>Furthermore, after peeling off half of the film, the inner deposition layer was exposed as a smooth deposition layer as shown.<\/p><p>To demonstrate the polymerization process originating from the two solvents, Fourier transform infrared spectroscopy (FITR) was further performed on pure DPGDME, VEC, electrolyte before and after cycling for 300 h at room temperature and 50 \u00b0C. The cycled battery showed no liquid present and the separator remained transparent, indicating that the electrolyte had evolved into a polymer state.<\/p><p>As shown, the initial electrolyte exhibits abundant H-stretching peaks for aliphatic chain single bonds, which is also observed in pure DPGDME. After cycling, fewer peaks remained but became sharp, and the peak at 1100 eV corresponding to the single-bond O\u2013C stretching showed an increase in intensity, indicating that DPGDME undergoes electrochemical polymerization upon activation and removal of \u0251-H.<\/p><p>In addition, the disappearance of the C\u2013H single bond stretching peak of the RCH=CH double bond indicates the polymerization of VEC. In situ polymerization originating from the two solvents can synergistically alleviate interfacial side reactions and irreversible consumption of lithium.<\/p><p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43714\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-performance-of-Li-S@pPAN-batteries.jpg\" alt=\"Electrochemical performance of Li-S@pPAN batteries\" width=\"1000\" height=\"495\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-performance-of-Li-S@pPAN-batteries.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-performance-of-Li-S@pPAN-batteries-300x149.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-performance-of-Li-S@pPAN-batteries-768x380.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrochemical-performance-of-Li-S@pPAN-batteries-600x297.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><br \/>Electrochemical performance of lithium sulfur batteries@pPAN<\/p><p style=\"text-align: left\">(a)Cycling stability with different electrolytes at room temperature. (b) The charge\/discharge curves of the 50th cycle at room temperature. (c) Cycling stability at 50 \u00b0C and 1 C using 1M LiFSI\/2D1V. (d) The charge\/discharge curves of the 50th cycle at 50 \u00b0C. (e) Long-cycle performance at 50 \u00b0C and 4 \u00b0C.<\/p><p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43719\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Fast-charging-performance-of-Li-S-batteries..jpg\" alt=\"Fast charging performance of Li-S batteries.\" width=\"1000\" height=\"506\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Fast-charging-performance-of-Li-S-batteries..jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Fast-charging-performance-of-Li-S-batteries.-300x152.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Fast-charging-performance-of-Li-S-batteries.-768x389.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Fast-charging-performance-of-Li-S-batteries.-600x304.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>Fast charging performance of lithium sulfur batteries<\/p><p style=\"text-align: left\">(a) CV curve at a scan rate of 0.6 mV s-1. (b) Linear fit of peak current to square root of scan rate. (c) GITT curve. (d) Rate capability. (e) Fast charge performance at 10 C. (f) CE in different step conditions.<\/p><p>The compatibility of the proposed electrolytes for S@pPAN cathodes was further evaluated. A 49.2 wt.% S@pPAN with higher sulfur content was prepared instead of the commonly reported S@pPAN (&lt;45 wt.%), aiming to improve the specific capacity based on the S@pPAN composite (822.6 mAh gC-1) . The performance at room temperature was compared using different electrolytes as shown.<\/p><p>STD electrolytes show a rapid decrease in capacity and an increase in overpotential. Excess sulfur molecules over 45 wt.% participate in harmful side reactions with carbonate electrolytes, resulting in thick CEIs with slow Li+ diffusion and irreversible electrolyte consumption.<\/p><p>In contrast, all the proposed electrolytes exhibit improved cycling stability and significantly reduced overpotentials, indicating favorable CEI formation on the S@pPAN cathode surface.<\/p><p>In the absence of LiPS shuttle, the solid-to-solid switching mechanism of S@pPAN is still good. More strikingly, compared with other electrolytes, the overpotential of 1M LiFSI\/2D1V is smaller, only 315.9mV, and the half-discharge capacity voltage is 1.912V.<\/p><p>Furthermore, it achieves a remarkable reversible capacity of 1539.5 mAh gS-1 or 756.8 mAh gC-1 (normalized in the S@pPAN composite) after 100 cycles, corresponding to a high sulfur utilization rate of 92.1%. Moderate VEC favors the formation of protective CEI to seal the active material in the conductive matrix for stable cycling.<\/p><p>At the same time, The main solvent, DPGDME, generates abundant polyethers to construct low-impedance CEIs and promote Li+ diffusion. It also exhibits excellent rate performance with a capacity retention of 90.7% after 300 cycles at harsh 4 C.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43725\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion.jpg\" alt=\"The main solvent, DPGDME, generates abundant polyethers to construct low-impedance CEIs and promote Li+ diffusion\" width=\"1000\" height=\"1000\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion-300x300.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion-150x150.jpg 150w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion-768x768.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion-700x700.jpg 700w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion-600x600.jpg 600w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-main-solvent-DPGDME-generates-abundant-polyethers-to-construct-low-impedance-CEIs-and-promote-Li-diffusion-100x100.jpg 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>In addition, elevated temperature was used to evaluate the performance of 1 M LiFSI\/2D1V. The discharge\/charge curves show that the overpotential is significantly reduced due to accelerated Li+ diffusion and promoted kinetics at high temperature.<\/p><p>In particular, the first discharge plateau rises from 1.92 to 2.05 V and provides a higher half-discharge capacity voltage of 1.951 V with a low voltage hysteresis (280 mV) at the 50th cycle. Its specific capacity increased significantly, reaching 809.5 mAhgC-1 (1645.3 mAh gS-1), corresponding to 98.4% sulfur utilization at 50 \u00b0C.<\/p><p>After 100 cycles at 1 C, the reversible capacity is 791.4 mAhgC-1 with a negligible loss rate of 0.022% per cycle. Furthermore, the cell using 1 M LiFSI\/2D1V showed an excellent average CE of 99.940%, indicating that there is almost no irreversible consumption of lithium in each cycle.<\/p><p>Compared with room temperature, a higher energy efficiency of up to 86.42% corresponding to less energy loss is achieved at high temperature.<\/p><p>More importantly, stable long cycling was achieved after initial activation, with an average CE of 99.9995% at 4 C and a remarkable capacity retention of 99.5% over 400 cycles. The electrolytes in 9D1V and 1D1V also exhibit high CE of over 99.9% with relatively low capacity.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43722\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-electrolytes-in-9D1V-and-1D1V-also-exhibit-high-CE-of-over-99.9-with-relatively-low-capacity..jpg\" alt=\"The electrolytes in 9D1V and 1D1V also exhibit high CE of over 99.9% with relatively low capacity.\" width=\"1000\" height=\"521\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-electrolytes-in-9D1V-and-1D1V-also-exhibit-high-CE-of-over-99.9-with-relatively-low-capacity..jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-electrolytes-in-9D1V-and-1D1V-also-exhibit-high-CE-of-over-99.9-with-relatively-low-capacity.-300x156.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-electrolytes-in-9D1V-and-1D1V-also-exhibit-high-CE-of-over-99.9-with-relatively-low-capacity.-768x400.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/The-electrolytes-in-9D1V-and-1D1V-also-exhibit-high-CE-of-over-99.9-with-relatively-low-capacity.-600x313.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>The highly loaded cathodes were further matched and tested in the proposed electrolyte. It is able to achieve stable cycling with a high areal capacity of 6.61 mAhcm-2 after 50 cycles, which is superior to previous reports using the same binder in STD electrolytes.<\/p><p>The excellent performance at harsh rates indicates fast Li+ transport kinetics. Cyclic voltammetry (CV) tests show that 1M LiFSI\/2D1V has a smaller potential interval between redox peaks and a significantly higher positive peak current, almost 1.5 times that of STD electrolyte, exhibiting significantly enhanced fast charging kinetics.<\/p><p>The Li+ diffusion coefficient was further determined at various scan rates. According to previous reports, the S@pPAN cathode in STD electrolyte exhibits slow charging kinetics compared with the discharge process.<\/p><p>However, the proposed electrolyte is able to achieve amazing accelerated charging kinetics, even better than the discharging kinetics, implying excellent fast charging capability. EIS is also being tested at the half-capacity point of lithium sulfur batteries using the proposed electrolyte. It exhibits lower impedance during charging compared to the discharging process.<\/p><p>A galvanostatic intermittent titration technique (GITT) was further performed to investigate the ion transport behavior during the entire cycle. The observed voltage change during the relaxation time upon charging is smaller than that during discharge, indicating ultrafast charging kinetics.<\/p><p>The attractive fast charging capability of S@pPAN in the proposed electrolyte is further demonstrated by rate capacity tests. In the previous report, considering that the slow charging process is the decisive step, a protocol of increasing the discharge rate while maintaining a constant charging rate was adopted to evaluate lithium sulfur batteries@pPAN.<\/p><p>The opposite protocol with a constant discharge rate while increasing the charge rate was performed to evaluate the fast charge capability. As shown, compared to the lower capacity and increased polarization of the STD electrolyte, the electrolyte lost negligible capacity when the charge rate was increased from 0.5 C to a harsh 4 C and the capacity was fully recovered at the return rate.<\/p><p>A higher charge rate of 10 C was applied in the figure, which provided stable performance after 200 cycles with a capacity retention of 91.4%.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43710\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/CE-plays-a-crucial-role-in-practical-batteries-with-limited-lithium-content.jpg\" alt=\"CE plays a crucial role in practical batteries with limited lithium content\" width=\"1000\" height=\"552\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/CE-plays-a-crucial-role-in-practical-batteries-with-limited-lithium-content.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/CE-plays-a-crucial-role-in-practical-batteries-with-limited-lithium-content-300x166.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/CE-plays-a-crucial-role-in-practical-batteries-with-limited-lithium-content-768x424.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/CE-plays-a-crucial-role-in-practical-batteries-with-limited-lithium-content-600x331.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>Notably, CE plays a crucial role in practical lithium sulfur batteries with limited lithium content. It is determined by the irreversible lithium consumption caused by the formation of interfaces and side reactions on the negative and positive sides. The reversibility of Li deposition\/stripping on Li metal anodes has been highlighted in numerous reported works.<\/p><p>However, when evaluating coin cells, the CE of sulfur-based cathodes is often ignored because the abundant lithium excess can complement the irreversible lithium depletion, thereby eliminating the effect of low CE. The authors focus on the lithium reversibility of the cathode and test CE in different steps, including discharging at 0.5 C while charging at 0.5 C, 1C, and 2C, respectively.<\/p><p>CE discharge and charge at 1C are compared together in Figure 5. Studies have shown that the slow discharge\/fast charge process can achieve CE above 99.99%, which promotes its application in long-life lithium sulfur batteries with limited lithium content.<\/p><p>The ultra-high CE and stable cycling indicate that there are few irreversible reactions on the cathode, which are attributed to the improved CEI and promoted kinetics. A stable mesophase was further demonstrated by EIS testing, where the impedance did not increase during cycling.<\/p><p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43717\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrode-interface-and-performance-of-Li-S@pPAN-batteries-under-practical-conditions.jpg\" alt=\"Electrode interface and performance of Li-S@pPAN batteries under practical conditions\" width=\"1000\" height=\"1114\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrode-interface-and-performance-of-Li-S@pPAN-batteries-under-practical-conditions.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrode-interface-and-performance-of-Li-S@pPAN-batteries-under-practical-conditions-269x300.jpg 269w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrode-interface-and-performance-of-Li-S@pPAN-batteries-under-practical-conditions-919x1024.jpg 919w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrode-interface-and-performance-of-Li-S@pPAN-batteries-under-practical-conditions-768x856.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/Electrode-interface-and-performance-of-Li-S@pPAN-batteries-under-practical-conditions-600x668.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><br \/>Electrode interface and performance of lithium sulfur batteries@pPAN under practical conditions.<\/p><p style=\"text-align: left\">(a,b) XPS spectra on Li and S@pPAN: C1 s (a) and O1 s (b). (c,d) Performance under limited lithium (c) and lean electrolyte (d). (e) Pouch cell performance.<\/p><p>The designed electrolyte especially maintains a good affinity with the S@pPAN cathode. The cycled lithium sulfur batteries@pPAN cell was disassembled and the two electrodes were analyzed by X-ray photoelectron spectroscopy (XPS) to confirm the interphase composition.<\/p><p>The S, N, and F elements come from the decomposition of LiFSI, which can construct a modified inner layer with good mechanical strength and high Li+ conductivity. The C 1 s spectrum of CEI content has four peaks at 290.1, 288.6, 286.2 and 284.8 eV, corresponding to -CO32-, OC=O, CO and single bond C, respectively.<\/p><p>It is worth noting that the C-O single bond content contained in CEI mainly derived from DDME was 32.65%, which was higher than that of -CO32- (4.86%) and OC=O (8.70%) derived from VEC (Fig. 6a). Consistent results are shown in the O1 s spectrum, where the single bond O\u2013C (533 eV) is 84.62% more intense than C=O (531 eV) (Fig. 6b).<\/p><p>The large single-bond O\u2013C abundance further suggests that the polyether is formed in situ from DDME during cycling and presents a polyether-rich CEI. The SEI on the lithium sulfur batteries anode consists of similar components. The XPS results indicated that an enrichment of polyether formed in the interface of the two electrodes.<\/p><p>The ultra-high CE of over 99.99% from the optimized CEI indicates negligible irreversible lithium consumption at the cathode interface. As shown, the lithium sulfur batteries performance was explored under limited lithium. It shows stable cycling for over 50 cycles with a 2-fold excess of lithium, delivering excellent performance even under harsh limited lithium usage (0.5-fold excess).<\/p><p>In addition, the amount of electrolyte was controlled to simulate the working conditions of an actual lithium sulfur batteries (2.14 gElectrolyte\/gS@pPAN, 0.7 times excess Li). As shown, it exhibits an initial reversible capacity of 448.4 mAhg-1, corresponding to 822.5 Whkg-1 based on anode and cathode, outperforming the performance of STD electrolytes.<\/p><p>The significantly improved performance under harsh conditions and the kinetics with fast charging capability and high CE open the way to push S@pPAN towards practical applications. Therefore, the performance of pouch cells is further explored under limited lithium and controlled electrolytes.<\/p><p>A high reversible capacity of 746.8 mAhgC-1 is provided, corresponding to 91.2% sulfur utilization and stable cycling, with a capacity retention of 84.6% after 60 cycles.<\/p><h2 id=\"Summary_and_outlook\">Summary and outlook<\/h2><p>In conclusion, the proposed electrolyte maintains significant advantages in terms of non-flammability, cathode compatibility, and unique in-situ electrochemical polymerization via \u0251-C-H activation in an electrochemical environment.<\/p><p>Compared with thick carbonate-derived CEI, the stable polyether-rich layer on the cathode not only enables fast Li diffusion and lower interfacial impedance, but also alleviates the lithium irreversibility hypothesis.<\/p><p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-43720\" src=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/In-harsh-conditions-the-pouch-battery-further-provides-excellent-performance.jpg\" alt=\"In harsh conditions, the pouch battery further provides excellent performance\" width=\"1000\" height=\"560\" srcset=\"https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/In-harsh-conditions-the-pouch-battery-further-provides-excellent-performance.jpg 1000w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/In-harsh-conditions-the-pouch-battery-further-provides-excellent-performance-300x168.jpg 300w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/In-harsh-conditions-the-pouch-battery-further-provides-excellent-performance-768x430.jpg 768w, https:\/\/www.takomabattery.com\/wp-content\/uploads\/2022\/05\/In-harsh-conditions-the-pouch-battery-further-provides-excellent-performance-600x336.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p><p>It achieves remarkable cycling stability with an ultra-high CE (99.9995%), and exhibits remarkable fast charging capability (10 C) and enhanced charging kinetics.<\/p><p>In harsh conditions, the pouch battery further provides excellent performance. Modified CEIs derived from electrolyte polymerization provide inspiration for intrinsically safe and practical long-life lithium sulfur batteries. If you want to know the industry information of pouch battery, you can refer to <a href=\"https:\/\/www.takomabattery.com\/top-10-pouch-battery-manufacturers-in-the-world\/\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline\"><span style=\"color: #333399;text-decoration: underline\">Top 10 pouch battery manufacturers<\/span><\/span><\/a> in the world.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a76c2c2 elementor-widget elementor-widget-heading\" data-id=\"a76c2c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-heading-title elementor-size-large\">Related posts<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-543a782 elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top 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class=\"elementor-post-date\">\n\t\t\tagosto 1, 2023\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>La polimerizaci\u00f3n electroqu\u00edmica realiza la carga r\u00e1pida a 10C de las bater\u00edas de litio-azufre Cuando todos sabemos qu\u00e9 bater\u00eda tiene m\u00e1s voltaje, ahora tambi\u00e9n nos encontramos con que las bater\u00edas de litio-azufre han atra\u00eddo una gran atenci\u00f3n debido a su alta densidad de energ\u00eda te\u00f3rica y a los abundantes recursos de azufre. El c\u00e1todo de despolimerizaci\u00f3n t\u00e9rmica de sulfuro (acrilonitrilo) (S@pPA) puede eliminar el efecto lanzadera debido a<\/p>","protected":false},"author":1,"featured_media":43716,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[210,209,211],"tags":[7,117,130,153],"class_list":["post-43709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-battery-industry","category-lithium-battery-market","category-lithium-battery-technology","tag-battery","tag-battery-cell","tag-lithium-battery","tag-lithium-ion-battery"],"modified_by":"tycorun666","_links":{"self":[{"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/posts\/43709","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/comments?post=43709"}],"version-history":[{"count":0,"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/posts\/43709\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/media\/43716"}],"wp:attachment":[{"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/media?parent=43709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/categories?post=43709"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.takomabattery.com\/es\/wp-json\/wp\/v2\/tags?post=43709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}