| 摘要 |
PROBLEM TO BE SOLVED: To provide copper foil for the negative electrode current collector of a nonaqueous solvent secondary battery having a large battery capacity when discharged for the first time and being excellent in charge/discharge cycle life, particularly an Li ion secondary battery, and a method for manufacturing the same. SOLUTION: This copper foil has the inverse number (1/C) of an electric double layer capacity on at least one side of the copper foil being 0.1 to 0.3 cm<2> /μF, and is manufactured by dipping either degreased rolled copper coil or electrolytic copper foil, which is water washed and dried after electrolytic foiling, either in a solution obtained by dissolving at least triazoles in a solvent or in an aqueous solution obtained by dissolving in water at least one kind selected from the group consisting of chromium trioxide, chromates, and bichromates. |
