Patent ID: 8168332
Filing Date: 2012-05-01
Classification: H01M,Y02E,Y02P

Abstract:
1. A separator, comprising: (A) a porous substrate having a plurality of pores; and (B) a porous coating layer formed on at least one surface of the porous substrate to have a thickness of 0.01 to 20 μm and made of a mixture of a plurality of inorganic particles with a particle size of 0.001 to 10 μm and a binder polymer, wherein a weight ratio of the inorganic particles to the binder polymer is 50:50 to 99:1, wherein the binder polymer comprises: wherein, based on the entire weight of the porous coating layer, the content of the first polyvinylidene fluoride-based copolymer is 5 to 30 weight %, the content of the second polyvinylidene fluoride-based copolymer is 1 to 10 weight %, and the content of the polymer having a cyano group is 0.1 to 5 weight %, respectively.