SEPARATOR FOR NONAQUEOUS ELECTROLYTE BATTERIES, AND NONAQUEOUS ELECTROLYTE BATTERY

摘要

A separator for nonaqueous electrolyte batteries having multilayer porous membrane, having a polyolefin microporous membrane and a porous layer having an inorganic filler, disposed on at least one side of the polyolefin microporous membrane, wherein, in pores with an area of 0.01 µm 2 or more in a cross section of the porous layer, the pores having an angle ¸ formed between a major axis of each pore and an axis in parallel with an interface between the microporous membrane and the porous layer in a range of 60° ‰¤ ¸ ‰¤ 120° occupying a proportion of 30% or more therein.