The Global Polyolefin Battery Separator Films Market was valued at USD 5,143 Million in 2025 and is projected to reach USD 12,390 Million by 2034, growing at a Compound Annual Growth Rate (CAGR) of 13.7% during the forecast period (2024–2034). This robust growth is primarily fueled by the global surge in electric vehicle (EV) adoption, rising demand for consumer electronics, and massive investments in renewable energy storage systems that require high-performance lithium-ion batteries.

As the world accelerates its transition to clean energy and electrified transportation, the critical component enabling battery safety and efficiency—the separator film—is gaining unprecedented importance. In this blog, we profile the Top 10 Companies in the Polyolefin Battery Separator Films Industry—a group of chemical giants and specialized manufacturers shaping the future of energy storage technology.

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🔟 1. Asahi Kasei Corporation

Headquarters: Tokyo, Japan
Key Offering: Hipore™ wet-process polyethylene (PE) and polypropylene (PP) separator films

Asahi Kasei is a global leader in polyolefin separator films, renowned for its Hipore™ brand. The company specializes in wet-process microporous membranes that offer exceptional heat resistance, mechanical strength, and electrolyte wettability, making them ideal for high-performance automotive lithium-ion batteries.

Innovation and Market Focus:

• Pioneer in wet-process separator technology

• Significant capacity expansions in Japan, the US, and Europe to meet EV demand

• Strong partnerships with major global battery manufacturers like Panasonic and LG Energy Solution

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9️⃣ 2. Celgard, LLC (A Part of Asahi Kasei)

Headquarters: Charlotte, North Carolina, USA
Key Offering: Dry-process PP and trilayer PP/PE/PP separator films

Following its acquisition by Asahi Kasei, Celgard remains a powerhouse in dry-process separator technology. Its trilayer membranes are industry standards for safety, providing a shutdown function that prevents thermal runaway in batteries, which is critical for automotive applications.

Innovation and Market Focus:

• Leading supplier to the North American and European EV markets

• Focus on high-temperature stability and shutdown separator technologies

• Extensive IP portfolio with over 500 patents globally

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8️⃣ 3. ENTEK

Headquarters: Lebanon, Oregon, USA
Key Offering: PE separator films for lead-acid and lithium-ion batteries

ENTEK is a major global manufacturer of extruded polyethylene battery separators. With a strong foothold in both the lead-acid and lithium-ion battery markets, the company is strategically expanding its lithium separator production capacity to capitalize on the EV boom, particularly in the US market.

Innovation and Market Focus:

• Vertically integrated manufacturing from resin to finished separator

• Recent $1.5 billion investment to build the largest US-based lithium separator plant in Indiana

• Strategic focus on supplying the domestic US EV battery supply chain

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7️⃣ 4. SK Innovation Co., Ltd.

Headquarters: Seoul, South Korea
Key Offering: Li-ion battery separators (SK IE Technology)

SK Innovation, through its subsidiary SK ie technology (SKIET), is one of the world’s top three lithium-ion battery separator manufacturers. The company produces both wet-process and coated separators, with a strong technological focus on enhancing battery safety and energy density for next-generation EVs.

Innovation and Market Focus:

• Mass production of high-performance ceramic-coated separators

• Aggressive global expansion with plants in Poland, China, and South Korea

• Strategic partnerships with automakers and battery cell producers worldwide

Download FREE Sample Report:
Polyolefin Battery Separator Films Market – View in Detailed Research Report

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6️⃣ 5. SEMCORP Global

Headquarters: Shanghai, China
Key Offering: Wet-process PE separators with ceramic coatings

SEMCORP has rapidly emerged as a dominant player in the global separator market, leveraging China’s massive battery production ecosystem. The company is a key supplier to CATL, BYD, and other leading Chinese battery manufacturers, with significant capacity expansions underway globally.

Innovation and Market Focus:

• World’s largest wet-process separator production capacity

• Strategic investments in Southeast Asia and Europe for global supply chain diversification

• Focus on ultra-thin, high-porosity separators for high-energy-density batteries

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5️⃣ 6. Toray Industries, Inc.

Headquarters: Tokyo, Japan
Key Offering: Torayset™ battery separator films

Toray Industries, a global leader in advanced materials, produces high-performance battery separator films under its Torayset™ brand. The company’s expertise in polymer science and membrane technology enables it to develop separators with superior heat resistance and ionic conductivity.

Innovation and Market Focus:

• Development of heat-resistant separators for enhanced battery safety

• Strong R&D focus on next-generation solid-state battery separators

• Strategic collaborations with Japanese automotive and battery manufacturers

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4️⃣ 7. UBE Corporation

Headquarters: Tokyo, Japan
Key Offering: Upilex® and Ube Polyethylene Separator films

UBE Corporation manufactures high-performance polyolefin separators with a focus on the automotive battery market. The company’s separators are known for their excellent dimensional stability and shutdown properties, making them suitable for high-power applications in electric vehicles.

Innovation and Market Focus:

• Specialization in high-heat-resistance polyimide separators for extreme conditions

• Expansion of production capacity to meet growing EV demand

• Focus on developing separators for fast-charging battery applications

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3️⃣ 8. Sumitomo Chemical Co., Ltd.

Headquarters: Tokyo, Japan
Key Offering: Microporous polyolefin separator films

Sumitomo Chemical is a major chemical company with a growing presence in the battery materials sector. The company produces high-quality polyolefin separators and is investing significantly in capacity expansion to capture market share in the rapidly growing EV battery segment.

Innovation and Market Focus:

• Development of functional coated separators for enhanced safety

• Strategic investments in Southeast Asian production facilities

• Collaboration with battery makers to develop customized separator solutions

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2️⃣ 9. LG Chem Ltd.

Headquarters: Seoul, South Korea
Key Offering: Battery separator films for lithium-ion applications

LG Chem, a vertically integrated battery materials company, produces separators primarily for internal consumption by its battery manufacturing affiliate, LG Energy Solution. This integrated approach ensures quality control and supply chain stability for one of the world’s largest battery producers.

Innovation and Market Focus:

• Vertical integration from separator production to cell manufacturing

• Focus on high-nickel NCMA and lithium iron phosphate (LFP) battery separators

• Global production footprint aligned with LG Energy Solution’s cell factories

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1️⃣ 10. Sojo Electric Co., Ltd.

Headquarters: Ningbo, China
Key Offering: Cost-competitive PE and PP separator films

Sojo Electric is a significant Chinese manufacturer of battery separator films, serving the domestic and international markets with competitive offerings. The company has been expanding its production capacity to meet the growing demand from China’s massive battery production industry.

Innovation and Market Focus:

• Focus on cost-effective separator solutions for mass-market applications

• Rapid capacity expansion to serve China’s dominant battery manufacturing sector

• Development of separators for emerging applications like energy storage systems

Get Full Report Here:
Polyolefin Battery Separator Films Market – View in Detailed Research Report

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🔋 Outlook: The Future of Battery Separator Films Is Smarter and Safer

The polyolefin battery separator films market is undergoing a technological transformation. While traditional polyethylene and polypropylene films continue to dominate, the industry is rapidly evolving toward functionalized and composite separators that enhance battery safety, energy density, and charging performance.

📈 Key Trends Shaping the Market:

• R&D in ceramic-coated and non-woven separators for enhanced thermal stability

• Development of ultra-thin separators (<10μm) for higher energy density batteries

• Growing demand for separators compatible with solid-state battery technologies

• Geographic diversification of production to reduce supply chain risks

Get Full Report Here:
Polyolefin Battery Separator Films Market – View in Detailed Research Report

The companies profiled above are not only supplying critical components for today’s batteries—they’re developing the advanced materials that will power the next generation of electric mobility and clean energy storage.