Rolled copper foil for lithium ion battery current collector, and lithium ion battery
AssigneeJX Metals Corporation
InventorKatsuhiro Kudo
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Abstract
Provided is a rolled copper foil for a lithium ion battery current collector, which has good adhesion to a negative electrode active material, generates less metal powder during ultrasonic welding, and has a rust prevention property. In the rolled copper foil for a lithium ion battery current collector, a surface of the copper foil has a BTA film, the BTA film has a thickness of 0.6 nm or more and 4.6 nm or less, and the rolled copper foil satisfies the following relationships: 40≤wet tension [mN]/m]+thickness of BTA film [nm]×10≤80; 0.01≤arithmetic average roughness Ra [μm]≤0.25; and wet tension [mN/m]≥35.
Claims10
A rolled copper foil for a lithium ion battery current collector, wherein a surface of the copper foil has a benzotriazole film, the benzotriazole film has a thickness of 0.6 nm or more and 4.6 nm or less, and wherein the rolled copper foil satisfies the following relationships:
- 40≤wet tension [mN/m]+thickness of benzotriazole film [nm]×10≤80;
- 0.01≤arithmetic average roughness Ra [μm]≤0.25;
- and
- wet tension [mN/m]≥35.
Dependencies are inferred from the claim text.