| 摘要 |
PROBLEM TO BE SOLVED: To provide a copper foil for a current collector, capable of satisfying both improvement in adhesion with an active material layer and improvement in bondability with an Ni tab lead, and a negative electrode collector for a lithium ion secondary battery using the copper foil for a current collector.SOLUTION: In a negative electrode collector for a lithium ion secondary battery, an active material layer 17 is formed on a surface of a rolled copper foil 11. The rolled copper foil 11 has a surface on which roughened particles 15 each comprising a copper roughened plating layer and a chromium based coating are formed. The roughened particles have an average particle size of 0.5 μm or more and less than 1.0 μm, and roughened particles 15 having a particle size of 0.2 μm or more and less than 1.5 μm exist 100 particles or more and less than 1,000 particles per 100 μm. |
