Patent ID: 9356273
Filing Date: 2016-05-31
CPC Classification: B01D,H01M,Y02E,Y02P

Claim Text:
1. A nonaqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; and a separator disposed between the positive electrode and the negative electrode, wherein the separator includes wherein the surface layer contains polyvinylidene fluoride and an inorganic material particle, the inorganic material composing at least 70 wt % of the surface layer, wherein an amount of deformation against pressure of the surface layer is larger than that of the substrate layer, wherein an average particle size of the inorganic material particle is not more than 50% relative to a thickness of the surface layer, and wherein the surface layer has a three-dimensional network structure in which continuously connected fibrils made of the polyvinylidene fluoride have an average diameter of not more than 1.0 μm.