Patent ID: 8062789
Filing Date: 2011-11-22
Classification: H01M,Y02E

Abstract:
1. A lithium secondary battery comprising a positive electrode, a negative electrode, a separator adapted to separate the positive and negative electrodes, and a non-aqueous electrolyte, wherein the separator includes a porous film comprising a mixture of a ceramic material and a binder, and the binder comprises an acrylic rubber having a cross-linked structure, wherein the acrylic rubber structure is formed by a cross-linking reaction between a polymer or copolymer of an acrylic main monomer and a cross-linkable co-monomer, wherein the polymer or copolymer of the acrylic main monomer and the cross-linkable co-monomer are mixed in a weight ratio in the range of 90:10 to 60:40 and the cross-linkable co-monomer is selected from the group consisting of 2-ethylhexyl acrylate, octyl acrylate, acrylonitrile, and combinations thereof.