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AssigneeHydro-Quebec
InventorsAlain Vallee, Michel Armand, Yves Choquette, Andre Belanger, Michel Gauthier, Michel Perrier, Karim Zaghib, Estelle Potvin, Simon Besner
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The invention concerns an aprotic electrolytic composition located in the separator and in at least one composite electrode containing a powder of an active electrode material, and if necessary an electronic conduction additive of an electrochemical generator. The electrolytic composition comprises a first polymer matrix consisting of a polyether and at least a second polymer matrix, macroscopically separated, and also at least an alkaline salt as well as a polar aprotic solvent: The polymer matrices are capable of being swollen by at least one of the polar aprotic solvents. The solvent or mixture of solvents is unevenly distributed between the polymer matrices. The invention also concerns an electrochemical generator comprising a negative electrode and positive electrode reversible to alkaline ions and a separator with polymer electrolyte, the electrolytic component of which is the composition described above. The invention further concerns the manufacture in two or three steps of a sub-assembly of an electrochemical generator by coating an electrode support with a composite electrode containing the second matrix, followed by a surface coating on the electrode resulting from the preceding step with a solution containing the first polymer matrix so as to form the separator wholly or partly.
Aprotic electrolytic composition for electrochemical generator, said generator including a separator and at least one opposite electrode, said composite electrode containing a powder of inactive material for the electrode and, if necessary, an electronic conduction additive, said aprotic electrolytic composition being localized in the separator and in at least said composite electrode, characterized in that it comprises a first polymer matrix consisting of a polyether and at least one second polymer matrix, which are macroscopically separated, and in that it also comprises at least one alkali metal salt, as well as at least one polar aprotic solvent, said matrices being swellable by at least one said polar aprotic solvent, said solvent or mixture of solvents being unequally distributed between the matrices.
Dependencies are inferred from the claim text.