Patent ID: 8852788
Filing Date: 2014-10-07
Classification: H01M,Y02E,Y02P

Abstract:
1. A porous membrane for a secondary battery comprising a binder for the porous membrane and a nonconductive particle, wherein the binder for the porous membrane is a polymer particle having a hetero phase structure, in which internal layer is a polymer wherein vinyl monomer components are polymerized and outer layer is a polymer wherein monomer components containing a hydrophilic functional group are polymerized, the nonconductive particle is different from the polymer particle, the polymer of the internal layer and the polymer of the outer layer have a different chemical structure, and the vinyl monomer components include at least any one of aliphatic vinyl monomer, (meth)acrylic acid ester monomer, amide group-containing (meth)acrylic monomer, multifunctional di(meth)acrylic monomer or aromatic vinyl monomer.