Patent ID: 6537695
Filing Date: 2003-03-25
Classification: D04H,H01M,Y02E

Abstract:
An electrochemical device comprising an anode, a cathode, a quantity of an electrolyte, and an electrode separator formed from a non-woven fabric which is formed from polyolefin fibers which have a mean thickness of less than about 30 &mgr;m and in which the fibers have not been subjected to a bonding process which causes intimate mixing of the materials of the fibers so that boundaries between the fibers remain discernible, said non-woven fabric having copolymerized to the surface of said fibers a vinyl monomer which is capable of reacting with an acid or a base to form a salt directly or indirectly by a reaction which involves exposure to ultraviolet radiation while impregnated with a solution of said vinyl monomer.