Separator and lithium battery employing same

Abstract

The separator includes: a porous substrate; a first coating layer arranged on at least one surface of the porous substrate, the first coating layer including a binder and inorganic particles, wherein the binder includes a cross-linked product of an aqueous cross-linking reactive poly(vinylamide)-based copolymer, wherein the poly(vinylamide)-based copolymer includes repeating units derived from vinylamide monomers and repeating units derived from cross-linking reactive group-containing monomers, and is cross-linked by the cross-linking reactive groups; and a second coating layer arranged on both surfaces of the porous substrate on which the first coating layer is arranged, the second coating layer including an acrylic copolymer and a polyvinylidene fluoride-based binder in a weight ratio of greater than 1:1 and less than 1:4. The separator has high thermal resistance characteristics and enhanced electrode plate adhesion, and therefore, a lithium battery having excellent lifespan characteristics may be provided.