Separator for nonaqueous secondary battery, and nonaqueous secondary battery

摘要

An object of the invention is to provide a separator for a nonaqueous secondary battery, which has good adhesion to electrodes and is also capable of ensuring sufficient ion permeability even after attachment to an electrode. The separator for a nonaqueous secondary battery of the invention includes a porous substrate and an adhesive porous layer formed on at least one side of the porous substrate and containing a polyvinylidene-fluoride-based resin. The separator for a nonaqueous secondary battery is characterized in that the polyvinylidene-fluoride-based resin has a weight average molecular weight of 600,000 to 3,000,000.

主权项

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.