Patent ID: 6506523
Filing Date: 2003-01-14
Classification: H01M,Y02E,Y02P

Abstract:
A solid-electrolyte secondary battery comprising:(a) a positive electrode; (b) a negative electrode; (c) a solid electrolyte disposed between the positive and negative electrodes, the solid electrolyte comprising a vinylidene fluoride/hexafluoropropylene block copolymer as a matrix polymer, the electrolyte containing lithium salt, the salt having a dissolution concentration of 0.1 to 3.0 mols/ltr; (d) wherein the positive electrode comprises a face and the negative electrode comprises a face, the face of the positive electrode being spaced apart from the face of the negative electrode with the solid electrolyte sandwiched therebetween, the solid electrolyte further formed on either the positive and negative electrode faces, or both, the solid electrolyte layer being obtained by impregnating a solution containing a solvent in which the solid electrolyte is dissolved into the faces of either the positive or negative electrodes or both, and removing the solvent from the solution; and (e) wherein the vinylidene fluoride/hexafluoropropylene block copolymer comprises a first component having a weight-average molecular weight of greater than 550,000, a second component having a weight-average molecular weight of greater than 300,000 and less than 550,000.