LAMINATE, SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, MEMBER FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a laminate that can be used as the separator of a secondary battery having a higher dielectric strength.SOLUTION: A laminate includes a porous film containing polyolefin as a main component, and a porous layer containing resin. The relationship of (A) the increase amount of dielectric strength for the increment in the amount of resin, contained per unit area of the porous layer, and (B) the increase amount of dielectric strength for the increment in the amount of polyolefin, contained per unit area of the porous film, is shown by (A)>(B).SELECTED DRAWING: None