Patent ID: 6579649
Filing Date: 2003-06-17
Classification: H01M,Y02E,Y02P

Abstract:
A polymer electrolyte battery including: a nonaqueous electrolyte, positive and negative electrode films or sheets, each having a first surface and a second surface, and each of which comprises a porous current collector, the porous current collector also having a first surface and a second surface, wherein a layer of active material mixture is disposed on the first surface and the second surface of said porous current collector, said layer of active material mixture containing a polymer capable of absorbing and retaining said electrolyte and pores formed by at least a pore-forming material, wherein the polymer of the layer of active material mixture is a copolymer of vinylidene fluoride and hexafluoropropylene, and porous separator films of a polymer capable of absorbing and retaining said electrolyte, said electrolyte being retained in said positive and negative electrode films or sheets and in said separator films, wherein said positive electrode films or sheets are unitarily laminated on said negative electrode film or sheet with said separator films being placed on the first surface and the second surface of said negative electrode film or sheet to form a unitary, laminated battery element sheet, and wherein said separator films and said layer of active material mixture of said positive and negative electrode films or sheets have a porosity in a range of 30 to 60%.