SEPARATOR FOR BATTERY AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a separator for a battery, which is excellent in self discharging property. SOLUTION: Ultrahigh-molecular polyethylene(UHPE) powders and particle powders such as zirconia particle powders or silica gel particle powders or the like which have ammonia trapping function are mixed. A sintered body is prepared by heating and sintering the mixture at a higher temperature than the melting point of the UHPE. A porous film is obtained by cutting the sintered body with a cutting lathe. The porous film is used as the separator for the battery.