| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolytic copper foil for a secondary battery collector, which has a small surface roughness, and in which formation of wrinkles after stretching and discolored streaks along the length direction is suppressed by making thickness in the width and length directions uniform.SOLUTION: An electrolytic copper foil for a secondary battery collector has 1.5% or less of difference in foil thickness in the width direction and is free from discolored streaks along the length direction on a surface of the copper foil, wherein the difference in foil thickness in the width direction is 1.4% or less. The electrolytic copper foil for the secondary battery collector has an average surface roughness Rzavg of 2.0 μm or smaller in the width direction on a matte surface and has 50% or less of variation in roughness (Rzmax-Rzmin)/Rzavg. |
