High Strength Rolled Copper Foil for Li-ion Battery

Application Examples

Rolled copper foil is used in automotive batteries and mobile devices as a negative electrode current collector.

Benefits for Customers

High strength
- ・Suitable for batteries using Si-based active materials with large volume changes.
Thin foil (Actual thickness 6µm)
- ・Thin foils are possible due to its high strength, and more current collectors can be stacked with batteries of the same volume, contributing to improved battery energy density.

LiB Cycle Test with Different Types of Copper Foils for Negative Electrode Current Collector

Features of High-Strength Copper Foil

HS1200&HS1200-V2 are high -strength copper alloy foils that have excellent heat resistance in terms of softening.
New copper alloy foil is being developed with better heat resistance than HS1200.
When slitting,the maximum width is 670mm and the maximum length is 8,000m.

Copper Foil	Thickness (µm)	Chemical Composition (wt.%)	Tensile Strength (MPa)
HS1200-V2	８～	Cu-0.12Sn	630
HS1200	6～	Cu-0.12Sn	550
Tough Pitch Copper	6～	Cu > 99.9	450
Electro-deposited foil	－	Cu > 99.9	350
New-Foil for LIB ※Under Development	８～	Cu-0.1Zr	620

All values are representative, not guaranteed.

Softening Curve (Annealing Time 0.5H)

High Strength Rolled Copper Foil for Li-Ion Batteries

Other products related to Next Generation Lithium-Ion Batteries