abstract |
An object of the present invention is to provide a novel copper foil, a negative electrode current collector of a lithium ion battery having the same, and a method for manufacturing the same. In one embodiment of the present invention, a copper foil having convex portions on at least a part of the surface, RSm of 1000 nm or less, and a surface area ratio of 1.15 or more is manufactured, and a negative electrode current collector is manufactured using this copper foil. |