A rolled copper foil for a secondary battery that has heat resistance which maintains high strength even after heat treatment is provided. A rolled copper foil for a secondary battery includes 0.05 to 0.15% by weight of Zr, 0.05% by weight or less of oxyge...

A steel foil according to an aspect of the present invention includes, by mass%, C: 0.0001 to 0.02%; Si: 0.001 to 0.01%; Mn: 0.01 to 0.3%; P: 0.001 to 0.02%; S: 0.0001 to 0.01%; Al: 0.0005 to 0.1%; N: 0.0001 to 0.004%; and a balance consisting of Fe and im...

An object of the present invention is to provide an aluminum alloy foil for an electrode current collector, the foil having a high strength after the drying step while keeping a high electrical conductivity. Disclosed is a method for manufacturing an alumi...