Patent ID: 9431641
Filing Date: 2016-08-30
CPC Classification: H01M,Y02E

Claim Text:
1. A separator for a nonaqueous secondary battery, comprising a porous substrate consisting of a polyolefin microporous membrane, and an adhesive porous layer that is formed on at least one side of the porous substrate and contains a polyvinylidene-fluoride-based resin, the separator for a nonaqueous secondary battery being characterized in that the polyvinylidene-fluoride-based resin has a weight average molecular weight of 600,000 or more and 3,000,000 or less, wherein the value obtained by subtracting the Gurley value of the porous substrate from the Gurley value of the separator for a nonaqueous secondary battery with the adhesive porous layer formed thereon is 0 to 300 sec/100 cc.