Skip to content 
Top 10 best Li-ion battery separator manufacturers in the world
As one of the four key materials for lithium batteries, the performance of the diaphragm directly affects the overall performance of the battery, including key indicators such as safety, cycle life and energy density. In recent years, with the advancement of technology and the growth of market demand, the global lithium battery diaphragm market has shown a booming trend. Against this backdrop, major diaphragm manufacturers have increased R&D investment in an effort to stand out in the fiercely competitive market.
Based on the latest market data, this article introduces the top 10 best Li-ion battery separator manufacturers in the world and discusses the performance of each enterprise in terms of technology research and development, capacity expansion, etc., with a view to providing readers with a comprehensive perspective to understand the status quo and development trend of the industry.
List of top 10 best Li-ion battery separator manufacturers in the world
The list of 10 best Li-ion battery separator manufacturers in the world:
- Semcorp
- Senior
- Asahi Kasei
- Toray Industries
- W-Scope
- SKIET
- Teijin
- Sinoma
- Huiqiang New Energy
- Gellec
Semcorp
Company website: https://www.semcorp.com/
Established date: 2010
Location: Shanghai, China
Semcorp is a high-tech enterprise specializing in the research, development and production of high-performance lithium-ion battery separators. semcorp was founded in 2010 in Nanhui Industrial Park, Pudong New Area, Shanghai, with a registered capital of RMB 389 million.
Semcorp has 14 subsidiaries and production bases for lithium battery separators in Shanghai, Zhuhai, Wuxi, Jiangxi, Suzhou, Chongqing and Hungary, specializing in the research, development and manufacture of high-performance lithium-ion battery separators.
Thanks to the breakthroughs in process and technology, semcorp has embarked on a fast track of rapid growth, and has built a number of production bases to expand its production capacity. The main products include wet base films and functional coated films of various specifications.
In 2024, semcorp successfully developed an ultra-thin and high safety base film with a thickness of only 3 microns. Semcorp invested in the construction of wet process lithium battery separator production line and supporting factory in Debrecen, Hungary in 2020, and the first phase of the construction work has been completed in 2024, and customer sample preparation and validation work is underway.
In July 2024, semcorp joined hands with LGES in South Korea to jointly develop the global new energy business. In July 2024, semcorp and Korea’s LGES joined hands to jointly develop the global new energy business.
Senior
Company website: https://www.senior798.com/
Established date: 2003
Location: Shenzhen, China
As one of top 10 lithium battery separator suppliers, Headquartered in Shenzhen, China, senior is a national high-tech enterprise with eight production bases and three R&D centers in Shenzhen, Osaka, Japan and Germany.
Its products cover lithium battery, dry and wet process, coated diaphragm, and it is the lithium battery diaphragm enterprise with the largest product range in the global industry, and its products are mainly used in new energy automobile, consumer electronics, energy storage power station, aerospace and aviation, and so on.
In April 2024, senior and Taihe New Material jointly established Yantai Xinghe Battery Material Technology Co., Ltd. and successfully developed a new type of high-quality SAFEBM® aramid coated diaphragm. In November 2023, senior and Foshan Xianhu Laboratory reached a strategic cooperation on the research and development of key materials for hydrogen energy.
Asahi Kasei
Company website: https://www.asahi-kasei.com/
Established date: 1931
Location: Tokyo, Japan
Founded on May 21, 1931, Asahi KASEI is a Japanese chemical company headquartered in Tokyo, Japan. AsahiKasei is one of the world’s leaders in the lithium battery diaphragm market, with particular strengths in the wet process diaphragm segment. The company has strong competencies in diaphragm technology and production capacity.
Asahi Kasei Li-ion diaphragm products are of two types: Asahi Kasei offers two types of Hipore™ wet process Li-ion battery diaphragms: a polyolefin microporous base film, and coated diaphragms produced by applying ceramic and other coatings to the base film. This business is an important part of Asahi Kasei’s growth strategy to meet the increasing demand for electric vehicles.
On April 25, 2024, it was announced that an integrated plant will be constructed in Ontario, Canada, for the manufacturing and coating of base films for Hie™ wet lithium-ion battery (LIB) diaphragms.
Toray Industries
Company website: https://www.toray.com/
Established date: 1926
Location: Tokyo
Founded in January 1926, Toray Industries is a high-tech multinational corporation with core technologies in organic synthesis, polymer chemistry and biochemistry, headquartered in Tokyo, Japan.
Toray has an important position in the field of wet-process diaphragms. The company has extensive experience and technology accumulation in the development and production of diaphragm materials. Toray ranked second in the global diaphragm market in 2016, holding a 20% market share.
On January 24, 2024, Toray announced that it had used ultra-high molecular weight polyethylene (UHMWPE) to create a new type of film that is almost as strong as stainless steel.
In May of the same year, Toray spend 500 billion won (contracted at 2.65 billion rmb) to expand production capacity of high-end environmental protection materials in South Korea, covering carbon fibers, battery septa, chemical fibers, films and other categories, and the period of the agreement ends in 2025.
W-Scope
Company website: https://w-scope.co.jp/
Established date: 2005
Location: Tokyo, Japan
W-Scope is a company specializing in wet-process diaphragms, and its business includes the manufacture and sale of plastic films and sheets. Major customers include LG Chem, Murata (Sony) and Everest Lithium.
W-Scope utilizes its unique polymer film technology to manufacture and sell separator films for lithium-ion secondary batteries, and is used in a variety of fields including information and communications, consumer appliances, conveyors, industrial equipment, and medical care.
SKIET
Company website: http://eng.skietechnology.com/
Established date: 2019
Location: Seoul, South Korea
Battery materials company SKIET (SK IE Technology Co.) is part of South Korea’s SK Innovation, which has a significant presence in the global market for its wet-process separator business.
In April 2019, SK Innovation split off and spun off to form SK IE Technology, which specializes in core materials for lithium-ion batteries ( Lithium-ion Battery Separator).
SKIET’s main product is lithium-ion battery separator, backed by Tesla, Panasonic, LG New Energy, Samsung SDI, SK On and other large customers, wet diaphragm market share reached 26.5% in 2020.
In 2023, SKIET as one of the giant lithium ion battery separator manufacturers, announced through the company’s official website that it plans to provide Shindanda with battery diaphragm products produced in its Changzhou factory in China.
Teijin
Company website: https://www.teijin.com/
Established date: 1918
Location: Tokyo, Japan
Teijin was founded in 1918 and is headquartered in Tokyo and Osaka, Japan. After 106 years of development, the company’s main areas of operation include materials businesses such as composite molding materials, aramid fibers, carbon fibers and resins, as well as pharmaceutical and medical businesses. The Group has 167 subsidiaries in more than 20 countries and regions around the world, with approximately 20,000 employees.
For diaphragm products, Teijin Group developed “LIELSORT” diaphragm by coating aramid and fluorine compounds on polyethylene substrate for the first time in the world, which has excellent performance in heat resistance and adhesion between electrodes.
In order to further strengthen the cooperation in the field of coated diaphragms, semcorp and Teijin entered into an agreement on the transfer of a share of technology patents related to the manufacture of aqueous coated diaphragms for lithium-ion secondary batteries in 2023.
This will further strengthen the competitiveness of the lithium-ion battery diaphragm-related business of the two parties by combining their strengths in the base film manufacturing technology, coating technology, intellectual property rights and other advantages.
Sinoma
Company website: http://lm.sinomatech.com/
Established date: 2016
Location: Shandong, China
Subsidiary of Sinoma Technology was incorporated in March 2016 in Tengzhou City, Shandong Province with a registered capital of RMB 4.17 billion. It specializes in the research and development, production, sales and technical services of lithium battery diaphragms, the four core materials of lithium-ion batteries. Currently, it has 27.2 million square meters/year base film production capacity and 6 million square meters/year coating capacity in Nanjing.
The main products of the company are 3～12μm wet process diaphragm and various types of coated diaphragm, which are used in new energy automobile power batteries, 3C consumer batteries, energy storage batteries and other fields. The products have superior performance and have been certified and used by many international medium and high-end lithium battery manufacturers.
In October 2023, Sinoma Lithium Membrane project, with a total investment of 4 billion yuan, is mainly engaged in the production and manufacturing of new energy battery diaphragms. Planning to build 8 intelligent automated base film production lines, 8 coated diaphragm production lines, the total production capacity of the project can reach 1.04 billion square meters after full production.
Huiqiang New Energy
Company website: http://www.hqnem.com.cn/
Established date: 2011
Location: Henan, China
Huiqiang New Energy is a high-tech enterprise engaged in the R&D, production and sales of lithium-ion battery diaphragms. With four manufacturing bases in Zhu madian, Wuhan, Xiangyang and Hefei, the company owns a number of invention patents. And has established production-academia-research partnerships with the Institute of Chemistry of the Chinese Academy of Sciences, Wuhan University of Technology, Sichuan University and other universities and institutes.
The company is mainly engaged in the research, development, production and sales of lithium battery diaphragm, based on the dry process, with multiple varieties and specifications of the product system.
The company focuses on the production, sales and R&D of new products and materials, such as three-layer co-extruded PP and PE with different materials and PP with the same material for lithium battery separator, PI separator, lithium battery composite separator with solid electrolyte membrane, PVDF coated separator and ceramic coated separator.
On August 15, 2024, Xuzhou Economic and Technological Development Zone signed a special diaphragm Xuzhou production base project with Huiqiang New Material Co. In April 2024, Huiqiang New Energy showed up at CIBF 2024 with new R&D products such as new polyolefin sodium-ion battery diaphragm and new polyolefin semi-solid battery diaphragm.
Gellec
Company website: http://www.gellec.com/
Established date: 2010
Location: Hebei, China
Founded in 2010, Gellec is a high-tech enterprise engaged in the research, development, production and sales of wet-process diaphragms for lithium batteries. Its products cover a wide range of base film specifications and various types of coated diaphragm products.
The company’s product system is rich in thicknesses ranging from 3μm to 25μm, and the coated diaphragms cover alumina coating, boehmite coating, various types of PVDF coatings, aramid coatings, and a variety of composite coatings.
This can be used for various types of lithium-ion power batteries, storage batteries, consumer batteries, and are widely used in downstream fields such as new energy automobiles, energy storage power stations, power tools, electric motorcycle battery, and 3C electronic products.
In 2024, Gellec signed a strategic cooperation agreement with SGS, and the two sides will further develop cooperation in the field of ISO14064 and ISO14067.
Gellec completed the construction of para-aramid synthesis line and put it into production at the beginning of 2023, and the production line has an annual capacity of 100 tons of synthetic aramid resin, which can match the double-sided coating capacity of 50 million square meters of diaphragm, thus realizing a complete integrated production capacity from the synthesis end to the diaphragm product end.
Conclusion
In summary, the global lithium battery diaphragm market is experiencing rapid development, and major manufacturers continue to improve their competitiveness through technological innovation and capacity expansion. As the demand for electric vehicles and energy storage systems continues to grow, the importance of lithium battery diaphragm as one of the key technologies is becoming more and more prominent.
In the future, with the application of more advanced materials and technologies, diaphragm manufacturers will face greater opportunities and challenges. We look forward to seeing these companies achieve more in terms of technological innovation and market expansion, contributing to the global clean energy transition.
