Degreasing method for aluminium hard foil, aluminium hard foil, aluminium hard foil electrode member, and lithium ion secondary battery using said member

摘要

An aluminum hard foil is degreased without reducing the hardness to improve the coating performance of coating material. A foil-rolled aluminum foil is subjected to a low-temperature heat treatment for holding the aluminum foil at 80 to 160° C. for 1 hour or more. The low-temperature heat treatment is preferably performed by subjecting the aluminum foil to batch processing with the aluminum foil coiled.