Patent ID: 8313865
Filing Date: 2012-11-20
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A separator made of a laminated porous film in which a heat-resistant layer that comprises a heat-resistant resin selected from the group consisting of polyamides, polyimides, polyamideimides, polycarbonates, polyacetals, polysulfones, polyphenylene sulfides, polyether ether ketones, aromatic polyesters, polyether sulfones and polyetherimides and a shut-down layer that comprises a thermoplastic resin are laminated, wherein the heat-resistant layer further comprises two or more fillers, and the value of D 2 /D 1 is 0.15 or less where among values each obtained by measuring the average particle diameter of particles that constitute one of the two or more fillers, the largest value is let be D 1 and the second largest value is let be D 2 , wherein a ratio of a weight of the filler consisting of the particles with the average particle size of D