The Global Lithium Battery Separator Material Market was valued at USD 5.8 Billion in 2023 and is projected to reach USD 12.7 Billion by 2030, growing at a Compound Annual Growth Rate (CAGR) of 11.8% during the forecast period (2024–2030). This robust expansion is propelled by the explosive demand for electric vehicles (EVs), the continual growth of consumer electronics, and massive investments in grid-scale energy storage systems.

As the demand for batteries with higher energy density, faster charging, and enhanced safety intensifies, the separator—a thin, porous membrane placed between the anode and cathode—plays a critical role. It is the guardian of battery safety and performance. In this blog, we profile the Top 10 Companies in the Lithium Battery Separator Material Industry—a group of established chemical giants and specialized material innovators who are shaping the backbone of the modern battery industry.

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🔟 1. Asahi Kasei Corporation

Headquarters: Tokyo, Japan
Key Offering: Hipore™ Wet-Process Polyolefin Separators

Asahi Kasei is a global leader in wet-process lithium-ion battery separators, a technology known for producing highly porous, uniform membranes that enhance battery power and safety. Their Hipore™ separators are widely used in automotive and industrial lithium-ion batteries across the globe.

Innovation & Capacity Initiatives:

• Investing over $1 billion to expand separator capacity in the U.S., Japan, and Europe.

• Pioneering ultra-thin, high-strength separators for next-generation solid-state batteries.

• Strategic long-term supply agreements with major automotive OEMs and cell manufacturers.

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9️⃣ 2. SK Innovation (SK IE Technology)

Headquarters: Seoul, South Korea
Key Offering: Li-ion Battery Separators (Wet & Dry Process)

SK IE Technology (SKIET), a subsidiary of SK Innovation, is one of the world’s top three separator manufacturers. It supplies separators for major EV battery makers and has a diversified portfolio catering to high-power and high-energy applications.

Innovation & Capacity Initiatives:

• Aggressive global capacity expansion in Poland, China, and South Korea targeting over 2.7 billion m² by 2025.

• Development of ceramic-coated separators for improved thermal stability and safety.

• Close collaborations with sister company SK On, a leading EV battery cell producer.

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8️⃣ 3. Toray Industries, Inc.

Headquarters: Tokyo, Japan
Key Offering: Toraycan™ Battery Separator Films

Toray leverages its deep polymer science expertise to produce high-performance battery separator films. Their separators are designed for excellent shutdown characteristics and mechanical strength, making them suitable for demanding automotive applications.

Innovation & Capacity Initiatives:

• Continuous R&D in advanced coating technologies to enhance separator functionality.

• Strategic investments to strengthen supply chains for the North American and European EV markets.

• Focus on sustainability through the development of bio-based polymer materials for future separators.

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7️⃣ 4. Celgard, LLC (Part of Polypore International, a subsidiary of Asahi Kasei)

Headquarters: Charlotte, North Carolina, USA
Key Offering: Dry-Process Microporous Membrane Separators

Celgard is a historic and highly respected name in the separator industry, renowned for pioneering dry-process technology. This process creates a highly oriented membrane with consistent pore structure, favored for its processing advantages and reliability in various battery formats.

Innovation & Capacity Initiatives:

• Industry-leading expertise in trilayer separators, which combine different polymers for optimal safety (shutdown) and performance.

• Significant production scale-up in the United States to support local battery manufacturing under the Inflation Reduction Act.

• Strong IP portfolio with hundreds of patents related to separator technology and manufacturing.

Download FREE Sample Report:
Global Lithium Battery Separator Material Market – View in Detailed Research Report

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6️⃣ 5. UBE Corporation

Headquarters: Tokyo, Japan
Key Offering: U-Pore™ Lithium-ion Battery Separators

UBE is a key integrated supplier, producing not only separators but also essential battery chemicals like electrolytes. Their separator business focuses on high-quality, reliable products for the automotive sector, benefiting from their vertical integration in battery materials.

Innovation & Capacity Initiatives:

• Investment in new production lines in Japan and Spain to meet growing European EV demand.

• Development of advanced separators with inorganic particle coatings for high-temperature endurance.

• Synergistic supply of separator and electrolyte solutions to battery cell partners.

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5️⃣ 6. Sumitomo Chemical Co., Ltd.

Headquarters: Tokyo, Japan
Key Offering: Porous Polyolefin Film Separators

Sumitomo Chemical is a major chemical company with a strong position in the lithium-ion battery separator market. They supply separators to a broad range of global battery manufacturers, emphasizing product consistency and quality control.

Innovation & Capacity Initiatives:

• Expansion of production capacity in Japan to solidify supply for premium battery applications.

• Research into novel polymer blends and manufacturing processes to reduce costs while maintaining performance.

• Active participation in industry consortia focused on standardizing battery safety and performance metrics.

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4️⃣ 7. Entek International LLC

Headquarters: Lebanon, Oregon, USA
Key Offering: Wet-Laid, Non-Woven Separator Materials

Entek takes a differentiated approach by specializing in wet-laid, non-woven separator technology. This process, distinct from the mainstream dry and wet processes for polyolefin films, uses a slurry of fibers to create a highly porous and tortuous structure, offering advantages in electrolyte absorption and safety.

Innovation & Capacity Initiatives:

• Major investment of over $1.5 billion to build large-scale separator manufacturing plants in the USA, specifically for the domestic EV battery supply chain.

• Exclusive licensee of BASF’s proprietary iron phosphate (LFP) cathode technology in the Americas, creating material synergies.

• Focus on producing separators optimized for the growing lithium iron phosphate (LFP) battery chemistry.

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3️⃣ 8. Evonik Industries AG

Headquarters: Essen, Germany
Key Offering: SEPARION® Ceramic Separator Coatings and Materials

Evonik is a leading specialty chemicals company that plays a vital role in the separator ecosystem through its advanced materials. Rather than making the base separator film, Evonik provides critical ceramic coating materials and technologies that battery makers apply to enhance separator safety and performance.

Innovation & Capacity Initiatives:

• World-leading producer of fumed alumina and silica used in ceramic separator coatings for thermal shutdown protection.

• Development of SEPARION® flexible ceramic membrane, a revolutionary separator alternative for very high safety applications.

• Strong R&D focus on materials for next-generation batteries, including solid-state electrolytes.

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2️⃣ 9. Mitsubishi Paper Mills (MPM) / MPI Incorporated

Headquarters: Tokyo, Japan
Key Offering: High-Performance Battery Separator Films

Mitsubishi Paper Mills (operating through its subsidiary MPI) applies its decades of expertise in precision film manufacturing to the lithium-ion battery separator market. They are known for producing ultra-thin, high-strength separators that enable higher energy density in battery cells.

Innovation & Capacity Initiatives:

• Specialization in separators for high-performance, compact batteries used in smartphones, laptops, and wearables.

• Continuous process innovation to improve film uniformity and reduce pinhole defects, a critical factor for battery yield and safety.

• Strategic partnerships with niche battery manufacturers requiring custom separator specifications.

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1️⃣ 10. W-Scope Corporation

Headquarters: Tokyo, Japan
Key Offering: Wet-Process Polyolefin Separators

W-Scope is a prominent and fast-growing player focused exclusively on wet-process separators. The company has successfully captured significant market share by aggressively expanding capacity and forming strategic alliances with leading Korean and Chinese battery giants.

Innovation & Capacity Initiatives:

• One of the most aggressive capacity expansion plans in the industry, with massive investments in production facilities in South Korea, Japan, and Hungary.

• Development of ultra-thin separators (below 5μm) to meet the demand for more compact and energy-dense battery cells.

• Long-term supply contracts with major EV battery manufacturers like LG Energy Solution and Samsung SDI.

Read Full Report:
Global Lithium Battery Separator Material Market – View in Detailed Research Report

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🔋 Outlook: The Future of Battery Separators is Smarter, Safer, and More Integrated

The lithium battery separator material market is undergoing a profound transformation. While polyolefin films dominate today, the future points toward functionalized, composite, and solid-state separators that are integral to cell design, not just passive components.

📈 Key Trends Shaping the Market:

• Localization of Supply Chains: Massive investments in separator production in North America and Europe to reduce dependency on Asian imports and comply with regional content requirements.

• Thinner and Stronger Films: Relentless drive towards sub-10μm and even sub-5μm separators to increase energy density, requiring breakthroughs in material science and processing.

• Inorganic and Ceramic Coatings: Widespread adoption of ceramic-coated separators becomes standard for EV batteries to prevent thermal runaway and enhance cycle life.

• The Solid-State Transition: Intense R&D into solid electrolytes and solid-state battery architectures, which may eventually redefine or even eliminate the traditional liquid-soaked separator.

Read Full Report:
Global Lithium Battery Separator Material Market – View in Detailed Research Report

The companies profiled above are more than material suppliers; they are essential innovation partners in the global quest for safer, more powerful, and longer-lasting batteries. Their advancements in separator technology are directly enabling the electrification of transport and the transition to a renewable energy grid, making them pivotal players in the clean energy revolution.