SEPARATOR FOR NONAQUEOUS ELECTROLYTE BATTERY AND NONAQUEOUS ELECTROLYTE BATTERY

摘要

Disclosed is a nonaqueous electrolyte battery which is excellent in nonaqueous electrolyte permeability and retainability in an electrode, while having high capacity, high energy density and good high-temperature charge characteristics. Specifically disclosed is a separator to be used in a nonaqueous electrolyte battery, which is obtained by forming a porous layer, which is composed of an inorganic fine particle and a resin binder, on a porous separator base. This separator for nonaqueous electrolyte batteries is characterized in that the resin binder is composed of at least one resin selected from the group consisting of polyimide resins and polyamideimide resins, and the resin has an acid value within the range of 5.6-28.0 KOHmg/g and an inherent viscosity within the range of 0.5-1.5 dl/g. The separator for nonaqueous electrolyte batteries is also characterized in that the resin binder content in the porous layer is not less than 5% by weight.