PROPYLENE RESIN MICROPOROUS FILM, SEPARATOR FOR BATTERY, BATTERY, AND METHOD FOR PRODUCING PROPYLENE RESIN MICROPOROUS FILM

摘要

The present invention provides a propylene-based resin microporous film which has excellent lithium ion permeability, can constitute a high-performance lithium ion battery, and can prevent a short circuit between a positive electrode and a negative electrode due to dendrites. The propylene-based resin microporous film of the present invention is a propylene-based resin microporous film containing micropores, wherein the degree of gas permeability is 100 to 400 s/100 mL, the standard deviation of the degree of gas permeability is 7 s/100 mL or less, the thermal shrinkage ratio during heating at 105°C for 2 hours is 6% or less, and the standard deviation of the thermal shrinkage ratio is 1% or less.