Aluminum foil for current collector and manufacturing method thereof, current collector, secondary battery and electric double layer capacitor

摘要

PROBLEM TO BE SOLVED: To provide an aluminum foil for a current collector having high adhesiveness to an electrode active material and a low contact resistance value with the electrode active material, to provide its manufacturing method, and to provide a current collector contributing to increasing characters such as the life of a secondary battery and an electric double layer capacitor. SOLUTION: This aluminum foil for a current collector has the average roughness Ra of 0.3-1.5 m as the roughness of at least one surface and the maximum height Ry of 0.5-5.0 m. Water or a nonflammable organic solvent is used as a medium, and alumina grains are sprayed to the surface of the aluminum foil to roughen the surface of the aluminum foil, thereby the aluminum foil for a current collector is manufactured.