Patent ID: 6077624
Filing Date: 2000-06-20
Classification: H01M,Y02E

Abstract:
A battery comprising a positive electrode element, a negative electrode element, and a separator membrane element disposed between said electrode elements, at least one of said electrode elements comprising a polymeric binder intermingled with an active material, said polymeric binder comprising a copolymer of vinylidene fluoride, at least one other fluorinated monomer, and cross-linking agent for said copolymer,wherein said at least one other fluorinated monomer is an ethylenically unsaturated monomer having at least as many fluoride atoms as carbon atoms, and said cross-linking agent is a polyhydroxylic aromatic cross-linking agent for said copolymer, and wherein the molar ratio of said vinylidene fluoride to said other fluorinated monomer is at least 90:10; andwherein said element exhibits increased resistance to degradation, said degradation due, at least in part, to selective dehydroflorination of vinylidine fluoride units in said copolymer.