MANUFACTURE OF SEALED BATTERY

摘要

PURPOSE:To prevent a positive electrode active material from clinging to an upper mold for press-forming the material in a battery case, by using a plasma CVD method to make a diamond-like thin film on the positive electrode active material contact surface of the mold. CONSTITUTION:A diamond-like thin film is made on the forming surface 9a of an upper mold 9 for a positive electrode active material 2' in a plasma CVD method employing a hydrocarbonaceous gas as a material. A positive electrode is formed in a case by using the upper mold 9. The thin film is an amorphous carbon film having a diamond bond. The hardness of the surface of the thin film is very high (2,000kg/mm<2> of more in Vickers hardness). The hard thin film serves to reduce the clinging (biting) of the positive electrode active material 2' to the forming surface 9a of the upper mold 9.