SEPARATOR FOR BATTERY AND BATTERY

摘要

PROBLEM TO BE SOLVED: To form a separator for a battery by employing a wet process nonwoven fabric excellent in mechanical strength manufactured without utilizing a binder, which impairs the performance of the separator battery. SOLUTION: This separator is made out of a wet process nonwoven fabric comprising a fiber interlaced by a water flow-interlacing treatment performed in a wet process. Particularly, a condition that an aspect ratio of the fiber constituting the nonwoven fabric lies between 200-3000 and that the water flow- interlacing treatment is performed for a nonwoven fabric material containing the fiber with water of 50% or more under a pressure within a range of 5-60 kgf/cm2 is preferable. Also the wet process nonwoven fabric is favorably subjected to a hydrophilic treatment.