Method for producing membrane of gel composite electrolyte

H - Electricity – 01 – M

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H01M 6/22 (2006.01) H01M 6/16 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2318835

A method is provided for the production of a membrane of gel composite electrolyte having a uniform membrane thickness. The method has the steps of: mixing a lithium salt, an electrolyte solvent having a boiling point at one atmospheric pressure of not less than 240 ~C and a diluting solvent having a boiling point at one atmospheric pressure of from 40~ to 210 ~C to obtain an electrolyte solution; mixing the electrolyte solution with a gelling agent to obtain a gel composite electrolyte; shaping the gel composite electrolyte into a membrane configuration; and removing the diluting solvent from the gel composite electrolyte. The method is characterized by the use of a diluting solvent. The diluting solvent facilitates the shaping step, thereby producing an electrolyte membrane having a uniform thickness. The gelling agent may be fumed silica.

L'invention concerne un procédé permettant de produire une membrane d'électrolyte composite en gel, d'épaisseur uniforme. Ce procédé consiste à mélanger un sel de lithium, un solvant pour électrolyte présentant un point d'ébullition égal à 240 ·C à la pression atmosphérique, et un solvant diluant présentant un point d'ébullition compris entre 40 ·C et 210 ·C à la pression atmosphérique, de manière à obtenir une solution électrolytique; à mélanger ladite électrolytique avec un agent gélifiant, de manière à obtenir un électrolyte composite en gel; à façonner ledit électrolyte composite en gel de façon à lui donner une configuration de membrane; et à extraire le solvant diluant de l'électrolyte composite en gel. Le procédé est caractérisé par l'utilisation d'un solvant diluant. Le solvant diluant facilite l'étape de façonnage, ce qui permet d'obtenir une membrane d'électrolyte d'épaisseur uniforme. L'agent gélifiant peut être de la silice sublimée.

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