Patent ID: 9735410
Date: 2017-08-15
CPC Classifications: H01G,H01M,Y02E,Y02P

Claim:
1. A multi-layer article comprising a first positive electrode material, a second negative electrode material, and a porous separator disposed between and in contact with the first and the second electrode materials, wherein the porous separator comprises a porous film (layer A) disposed in a face to face relationship with a non-woven fabric layer (layer B); said non-woven fabric layer B having a mean fiber diameter of 3 μm or less, a mean pore size of 6 μm or less, and a porosity less than 40%; said porous film A having a thickness of 2 μm or greater and is a micro-porous polyolefin membrane having a mean flow pore size of less than or equal to 0.5 μm and a porosity of 30 to 60%; and wherein; the B layer consists of fibers of fully aromatic polyimide that is at least 90% imidized; and wherein the thickness of the A layer plus the B layer combined is less than or equal to 50 microns.