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.
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: 複合銅箔 | 帝国イオン株式会社
- Original language: JA
- Summary AI-assisted; translation status: Unreviewed