Patent ID: 9634311
Date: 2017-04-25
CPC Classifications: H01M,Y02E

Claim:
1. A separator, comprising: a polyolefin base film and a coating layer on one or both sides of the polyolefin base film, the coating layer containing, based on 100 parts by weight of the coating layer in terms of solid content, 5 to 10 parts by weight of a polyvinylidene fluoride homopolymer, 5 to 20 parts by weight of a polyvinylidene fluoride-hexafluoropropylene copolymer, a solvent, and 70 to 90 parts by weight of inorganic particles, the solvent being present in an amount of 100 ppm or less in the coating layer, wherein the polyvinylidene fluoride homopolymer has a weight average molecular weight of 1,000,000 g/mol or more and the polyvinylidene fluoride-hexafluoropropylene copolymer has a weight average molecular weight of 800,000 g/mol or less.