PROCESS FOR PREPARING POROUS ELECTROLYTIC METAL FOIL

摘要

A process for preparing a porous electrolytic metal foil by electrodepositing a metal on a drum cathode by using a drum cathode and an anode to form a metal foil layer and separating the formed layer from the drum cathode, wherein a coating of an electrically insulating material is formed on the cathode surface exposed after the foil separation by subjecting the exposed surface to electrolytic oxidation, by spraying the exposed surface with a resin liquid, or by suspending a machine oil or the like in an electrolyte to deposit the machine oil onto the exposed surface. The metal foil thus obtained has a large number of interconnecting pores in the direction of thickness and, when used as a collector substrate of an electrode for a battery, can prevent the separation of a composite for a battery, thus contributing to an improvement in the cycle time of a battery.