Asahi Kasei Completed Its Charlotte Battery-Separator Line. Supply to Toyota Tsusho Is Planned for Mid-2027.

Asahi Kasei says it has completed a new Hipore lithium-ion-battery separator coating line at its existing Celgard facility in Charlotte, North Carolina, moving a project first announced in 2023 toward commercial production. The company held a completion ceremony Aug. 20 and announced the milestone Aug. 26.¹

Commercial production has not started yet. Asahi Kasei says the Charlotte line is scheduled to begin commercial output in the second half of fiscal 2026, a window that corresponds roughly to October 2026 through March 2027 because the company's fiscal 2026 ends in March 2027.¹²

The line also has a defined commercial path beyond commissioning. Toyota Tsusho America holds a preferential share of its Hipore production capacity under a capacity-rights agreement announced in July 2025, with coated separator supply from Charlotte scheduled to begin in mid-2027.³

That makes the Aug. 26 announcement more than another battery-factory plan. Charlotte has now moved from an investment decision to trial operation and completed equipment, while a portion of future capacity is already reserved for a North American automotive-battery supply chain.¹³⁴

From a 2023 investment to completed equipment

A battery separator is the porous membrane between a lithium-ion cell's positive and negative electrodes. It allows lithium ions to move through the cell while keeping the electrodes physically apart. Asahi Kasei's Charlotte project adds wet-process Hipore coating capability inside the existing Celgard facility; the company's current public material does not establish Charlotte as an integrated Hipore base-film manufacturing site.¹⁵

Asahi Kasei first announced the broader coating expansion in October 2023. That program covered three locations — Charlotte; Hyuga, Japan; and Pyeongtaek, South Korea — with about ¥40 billion of investment and about 700 million square meters per year of added coating capacity across the three sites combined.⁵

Those figures are not Charlotte-only numbers. Asahi Kasei's current Charlotte announcement does not publish a standalone annual capacity or investment figure for the North Carolina line.¹⁵

By April 2026, the company said trial operation in Charlotte had begun the previous month and commercial production remained scheduled for the second half of fiscal 2026.⁴ The Aug. 20 completion ceremony is therefore another step in a sequence that now runs from the 2023 investment decision to March trial operation, August completion and a planned commercial-production ramp.¹⁵⁴

Toyota Tsusho has preferential capacity rights

Asahi Kasei Battery Separator America and Toyota Tsusho America finalized their capacity-rights agreement in July 2025. The agreement gives Toyota Tsusho America preferential access to a portion of Asahi Kasei's Hipore production capacity, and the companies said Charlotte supply is scheduled to start in mid-2027.³

The agreement is explicitly aimed at a North American automotive lithium-ion-battery supply chain. But the public announcement does not identify the downstream cell manufacturer, battery plant or automaker that will ultimately use the separator.³

That distinction matters because Toyota Tsusho's involvement does not establish that the Charlotte material is destined for Toyota Motor vehicles. What is public is narrower: Toyota Tsusho America has preferential capacity rights and a planned mid-2027 supply start.³

Charlotte is moving sooner than Asahi Kasei's Canadian ramp

The Charlotte milestone also shows how Asahi Kasei is sequencing its North American separator buildout as EV-growth expectations have weakened.

In an April management briefing, Asahi Kasei said construction of its Canadian Hipore plant was progressing on schedule for completion in 2027. At the same time, the company said it would determine the plant's operating start based on market conditions and was assuming a delay of 1.5 to two years because growth in the North American EV market had slowed.⁴

Asahi Kasei also said it expected to supply the North American market from existing facilities in Japan and South Korea while the market develops, with full operation of the Canadian plant expected from 2030 onward.⁴ Those are company plans and forecasts, not achieved production milestones.

The Aug. 26 Charlotte release says construction of the Canadian separator facility is still progressing, but it does not provide a new commercial-start date.¹

That leaves Charlotte as the nearer-term North American execution point. The coating line is complete, trial operation has already begun and commercial production is scheduled within the current fiscal year. The next proof points are actual commercial output, customer qualification and the planned mid-2027 Toyota Tsusho supply start — along with any Charlotte-specific capacity disclosure or updated operating date for the Canadian project.¹³⁴

Sources

Footnotes

1. Asahi Kasei completes Hipore coating line in Charlotte — Asahi Kasei Corp., Aug. 26, 2026; ceremony held Aug. 20. https://www.asahi-kasei.com/jp/news/2026/ze260826 Establishes the Charlotte completion/opening milestone, coating-line scope, H2 FY2026 commercial-production schedule and current statement that Canadian construction is progressing. Future production and demand statements are company plans. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

2. Financial Results / Briefing — Fiscal 2026 (ending March 2027) — Asahi Kasei Corp., current 2026 IR surface. https://www.asahi-kasei.com/ir/library/financial-briefing Establishes Asahi Kasei's fiscal-year framing used to map H2 FY2026 to approximately October 2026 through March 2027; it does not establish a precise startup date within that window. ↩

3. Asahi Kasei to supply Hipore lithium-ion battery separator to Toyota Tsusho — Asahi Kasei Corp. / Toyota Tsusho Corp., July 31, 2025. https://www.asahi-kasei.com/news/2025/e250731 Establishes Toyota Tsusho America's preferential capacity rights, planned mid-2027 Charlotte supply and the North American automotive-battery supply-chain purpose. It does not identify a downstream cell maker or automaker. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

4. MTP 2025-27 business briefing — North American Hipore — Asahi Kasei Corp., April 15, 2026. https://www.asahi-kasei.com/content/dam/asahi-kasei/us/en/ir/library/initiative/pdf/e260415en.pdf Establishes March 2026 Charlotte trial operation, the H2 FY2026 commercial-production target, the Canadian construction/operating-timing distinction, the assumed 1.5-2-year operating delay, interim Japan/South Korea supply and the company's 2030-onward full-operation expectation. Future timing and market outlook are company forecasts. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

5. Asahi Kasei to significantly expand coating capacity for lithium-ion battery separators — Asahi Kasei Corp., Oct. 31, 2023. https://www.asahi-kasei.com/news/2023/e231031 Establishes the original three-site coating expansion, aggregate approximately ¥40 billion investment and approximately 700 million m²/year added coating capacity, and the technical distinction between separator base film and coated separator. The scale figures cover Charlotte, Hyuga and Pyeongtaek together, not Charlotte alone. ↩ ↩² ↩³ ↩⁴