Ultra-thin composite copper foil for lithium-ion battery anode current collectors
PET film (6µm) base with copper plating (~1µm per side) achieving 4µm total thickness, half the weight, and one-quarter the copper consumption of conventional rolled copper foil, enabling lighter, more resource-efficient battery cells.
AI-assisted directory summary. Technical specifications, performance metrics, readiness and compliance labels are unverified unless individually supported and reviewed. Proposed partnership routes do not establish supplier consent, export eligibility, or willingness to sign an NDA. Confirm claims and test conditions with the linked sources and supplier before procurement or citation.
Problem solved
Conventional rolled copper foil for Li-ion battery anodes is limited to ~8µm minimum thickness before handling becomes impractical (tearing, wrinkling). Thinner foil could reduce battery weight and material cost, but thin copper alone is too fragile. Teikoku Ion's composite approach uses a polymer film substrate for mechanical strength while plating ultra-thin copper layers for conductivity, breaking the thickness barrier.
Application contexts
- EV lithium-ion battery anode current collectors
- Lightweight battery design for mobility
- Copper-resource-efficient battery manufacturing
Technical principle
Roll-to-roll copper plating on 6µm PET film base, with ~1µm copper layer on each side. The polymer core provides mechanical handling strength while the plated copper delivers electrical conductivity equivalent to thicker solid copper foil for anode current collector duty.
Typical use cases
- Anode current collector weight reduction for high-energy-density EV cells
- Copper usage reduction in battery supply chains under CBAM
Partnership route
How global engineering teams typically engage this asset.
Helpful to include: target foil width and roll length · required adhesion strength to active material · electrolyte compatibility test results · annual volume requirement · target cell energy density envelope
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Source & provenance
Translation review status: unreviewed. Publication does not establish technical verification or supplier endorsement.
Original language: JA.
Record updated: .
- 複合銅箔 | 帝国イオン
https://teikoku-ion.co.jp/future_plating/copper-foil/
Primary-source candidate; evidence review: pending.
Source accessed / recorded (collector timestamp): .
Source publication date: Not recorded.
- 会社情報 | 帝国イオン
https://teikoku-ion.co.jp/profile/
Primary-source candidate; evidence review: pending.
Source accessed / recorded (collector timestamp): .
Source publication date: Not recorded.
- 近畿経済産業局 次世代革新型電池 中小ベンチャー事例集
https://www.kansai.meti.go.jp/3jisedai/battery/jireishu_250328.pdf
Supporting / discovery source; evidence review: pending.
Source accessed / recorded (collector timestamp): .
Source publication date: Not recorded.
Collector timestamps record when a source was stored, not an independent verification date. Source links provide context; they do not validate every specification, readiness label, certification, or proposed partnership route.