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 which has a higher dielectric strength and is suitable as a separator.SOLUTION: A laminate comprises: a porous film including polyolefin as a primary component; and a porous layer laminated on one or each face of the porous film and including a resin. The relation between a rise (A)(V m2/g) of the dielectric strength of the porous layer to an increase of the amount(g/m2) of the resin included in the porous layer per unit area of the porous layer and a rise (B)(V m2/g) of the dielectric strength of the porous film to an increase of the amount (g/m2) of the polyolefin included in the porous film per unit area thereof is shown by (A)>(B). The relation between an average pore diameter (C) of the porous film, and a porosity (D) is shown by (C)/(D)≤0.13.SELECTED DRAWING: None