| abstract |
The invention discloses a separator for a rechargeable battery and a rechargeable lithium battery comprising the separator. The separator for a rechargeable battery includes: a porous substrate, and a A heat-resistant porous layer on at least one surface of a substrate, wherein the heat-resistant porous layer includes a copolymer and a filler, the copolymer includes a structural unit derived from vinylidene fluoride, a structural unit derived from hexafluoropropylene, and a filler derived from Structural units derived from carboxyl group-containing monomers, based on the amount of the copolymer, the amount of the structural units derived from hexafluoropropylene included is from about 4 wt% to about 10 wt%, and based on the amount of the copolymer, the included The amount of structural units derived from carboxyl-containing monomers is from about 1 wt% to about 7 wt%. |