Patent ID: 8632652
Filing Date: 2014-01-21
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A method for manufacturing a separator comprising: (S1) preparing a porous substrate having pores; (S2) coating a slurry on at least one surface of the porous substrate, the slurry containing inorganic particles dispersed therein and a first binder polymer dissolved in a first solvent; (S3) adjusting a loading amount of a second binder polymer in a binder solution such that a loading amount of the second binder polymer in a porous polymer outer layer is in the range between 0.1 and 3.0 g/m (S4) coating the binder solution on the slurry, the binder solution consisting of a second binder polymer dissolved in a second solvent; and (S5) simultaneously drying the first and second solvents to form the porous polymer outer layer of the second binder polymer and an organic-inorganic composite inner layer, wherein the porous polymer outer layer has pores formed while the second solvent is dried, and the organic-inorganic composite inner layer has pores or interstitial volumes formed between the inorganic particles when the inorganic particles are bonded and fixed to each other by the first binder polymer while the first solvent is dried.