| abstract |
Provided is a separator for a non-aqueous secondary battery, including: a porous substrate having an average pore diameter of from 20 nm to 100 nm; and a porous layer provided on one or both sides of the porous substrate and including a polyvinylidene fluoride resin and a filler, the porous layer including a filler in an amount of from 45% by volume to 75% by volume with respect to a total solid content of the porous layer, a weight average molecular weight of the polyvinylidene fluoride resin being 1,000,000 or more, and a peel strength between the porous substrate and the porous layer being 0.20 N/12 mm or more. |