Celgard

Celgard, a global leader since the 1960s, specializes in high-performance microporous membranes for lithium-ion batteries used in electric vehicles, consumer electronics, and energy storage. As part of the Asahi Kasei Group, Celgard leverages advanced manufacturing and research to deliver reliable battery separators.

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Celgard stands as a global leader in developing and manufacturing high-performance microporous membranes, with particular expertise in battery separator technology. Founded in the mid-1960s, the company has established itself as an essential supplier for the energy storage industry, specifically in lithium-ion battery applications. Their products serve various sectors, including electric vehicles, consumer electronics, and industrial energy storage systems. Operating as part of the Asahi Kasei Group, Celgard combines extensive research capabilities with advanced manufacturing processes to create reliable, efficient battery components that meet strict industry standards.

Battery Technology

Celgard’s primary focus lies in producing advanced microporous membranes using a specialized solvent-free dry-process manufacturing technique. These membranes function as critical safety components in lithium-ion batteries, preventing electrical shorts between the anode and cathode while enabling efficient ion transfer. The company offers two main product categories:

The first consists of monolayer polypropylene (PP) separators, engineered for applications requiring high-temperature operation without shutdown features. These separators demonstrate exceptional chemical and dimensional stability, making them suitable for demanding battery applications.

The second category comprises trilayer PP/PE/PP separators, which combine polypropylene and polyethylene layers. This structure provides enhanced protection against thermal events and improved stability at higher voltages. Both product lines undergo rigorous quality control processes to ensure consistent performance and reliability in various battery applications.

Recent Projects

In early 2024, Celgard announced a significant expansion of its Charlotte, North Carolina manufacturing facility. This project includes installing Hipore wet-process coating and finishing lines, creating approximately 100 new jobs. Operations are scheduled to begin in 2026, increasing production capacity for lithium-ion battery separators.

The company also formed strategic alliances with Æsir Technologies and Lithion Battery to advance innovation in various battery technologies, including Nickel-Zinc, Zinc-Air, and Lithium-Zinc batteries. These partnerships focus on developing cost-effective, recyclable solutions for applications in aviation, data centers, and electric vehicle charging infrastructure.

Investors

Celgard operates as a subsidiary of Polypore International, LP, which was acquired by the Asahi Kasei Group in 2015. This ownership structure provides Celgard with substantial financial backing and access to global resources. The company has received government support through various initiatives, including a $49 million grant from the U.S. Department of Energy and additional funding from state and local programs such as the Job Development Investment Grant and the One North Carolina Fund.