Patent ID: 7659036
Filing Date: 2010-02-09
Classification: H01M,Y02E

Abstract:
1. A lithium rechargeable battery comprising a cathode, an anode, a separator that separates the cathode and the anode from each other, and a non-aqueous electrolyte, wherein the separator includes a porous membrane formed of a ceramic material and a binder, wherein the binder is an acrylic rubber formed by crosslinking of a polymer or copolymer of a main acrylic monomer with a crosslinkable comonomer, wherein the binder has an initial decomposition temperature of 250° C or higher and exhibits a swelling resistance when the porous membrane is impregnated with the non-aqueous electrolyte, wherein the ceramic material comprises secondary particles made up of sintered or recrystallized ceramic primary particles, and wherein the ceramic material and the binder are mixed in a weight ratio of 95:5 ˜80:20.