Patent ID: 6395419
Filing Date: 2002-05-28
Classification: H01G,H01M,Y02E,Y02P

Abstract:
A method for preparing a solid polymer electrolyte, comprising the steps of:forming a solution of a polymer and a filler in a solvent into a non-plasticized film, evaporating off the solvent from the non-plasticized film, and impregnating the non-plasticized film with an electrolytic solution, wherein (a) the solvent of the polymer/filler solution is different from the solvent of the electrolytic solution; (b) evaporation is carried out without an extraction step of dipping the non-plasticized polymer film in a large volume of solvent several times or heating the non-plasticized polymer film in vacuum; and (c) forming and evaporating are carried out in an ambient environment without a need for a dry atmosphere.