Patent ID: 9559345
Date: 2017-01-31
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A separator having a layered structure comprising; (a) a non-woven fabric substrate having pores formed among microfibers constituting the non-woven fabric substrate, (b) fine thermoplastic powder filling the pores of the non-woven fabric substrate and having an average diameter smaller than that of the pores of the non-woven fabric substrate and a melting point lower than the melting point or decomposition point of the non-woven fabric substrate, and (c) a porous coating layer disposed on at least one surface of the non-woven fabric substrate whose pores are filled with the fine thermoplastic powder, and comprising a mixture of inorganic particles and at least one binder polymer whose melting point is higher than the melting point or decomposition point of the fine thermoplastic powder, the inorganic particles being fixedly connected to each other by the binder polymer and the pores of the coating layer being formed by interstitial volumes between the inorganic particles.