Patent ID: 9005795
Filing Date: 2015-04-14
Classification: H01M,Y02E

Abstract:
1. A separator comprising: (A) a planar non-woven fabric substrate having a plurality of fibers and pores; and (B) a porous coating layer provided on at least one surface of the non-woven fabric substrate and made of a mixture of a plurality of inorganic particles and a binder polymer, wherein: (1) the fibers of the non-woven fabric substrate consist of superfine fibers, the fibers having an average thickness of 0.5 to 10 μm; (2) among the distribution of pore size in the non-woven fabric substrate, pores having a wide diameter of 0.1 to 70 μm are 50% or above of the entire pores; and (3) a loading weight of the porous coating layer with respect to the non-woven fabric substrate is 5 to 20 g/m wherein the superfine fibers have a melt temperature of 200° C. or above, and wherein the superfine fibers are made of any polymer selected from the group consisting of polyester, polyacetal, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide, polyethylene naphthalene and mixtures thereof.