Separator for non-aqueous electrolyte battery and non-aqueous electrolyte battery

摘要

A separator for non-aqueous electrolyte batteries is provided that has small heat shrinkage and achieves good heat resistance and good cycle performance. A non-aqueous electrolyte battery using the separator is also provided. A separator for non-aqueous electrolyte batteries includes a microporous film in which a polyolefin layer and a heat-proof layer are adhered. The heat-proof layer has a thickness of from 1 mum to 4 mum, and is formed of polyamide, polyimide, or polyamideimide having a melting point of 180° C. or higher. The air permeability of the separator is 200 sec/100 mL or less.