Patent ID: 9368777
Filing Date: 2016-06-14
CPC Classification: C08J,H01M,Y02E,Y02P,Y02T

Claim Text:
1. An electrochemical device comprising: (a) a composite separator comprising a porous substrate, a first porous coating layer coated on one surface of the porous substrate and composed of a mixture comprising inorganic particles and a binder polymer, and a second porous coating layer coated on the other surface of the porous substrate and composed of a mixture comprising inorganic particles and a binder polymer, wherein the first porous coating layer is thicker than the second porous coating layer, wherein interstitial volumes present between the inorganic particles of the first coating layer form a pore structure, and wherein interstitial volumes present between the inorganic particles of the second coating layer form a pore structure; (b) an anode disposed to face the first porous coating layer; and (c) a cathode disposed to face the second porous coating layer, wherein the thicknesses of the first and second porous coating layers satisfy the following relationship 1: wherein T wherein the total thickness of the first and second porous coating layers is from 1.0 to 20.0 μm.