abstract |
An object of the present invention is to provide a microporous polyolefin membrane having excellent self-discharge characteristics when incorporated into a battery as a separator. In the present invention, the rate of change in film thickness when heated and compressed at a temperature of 80 ° C. and a pressure of 1 MPa for 60 minutes is 0% or more and 15% or less with respect to 100% of the film thickness of the polyolefin microporous film before heat compression. By a polyolefin microporous membrane or the like. [Selection diagram] None |