Lithium secondary battery using gelled polymeric electrolyte

Details Lithium secondary battery using gelled polymeric electrolyte Lithium secondary battery using gelled polymeric electrolyte

H - Electricity

01

M

H01M 2/14 (2006.01) H01M 4/02 (2006.01) H01M 6/18 (2006.01) H01M 10/40 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2334240

A cell which utilizes spinel type lithium manganate as an active material and comprises a positive electrode containing a gelled polymer electrolyte (A), a negative electrode and a gelled polymer electrolyte (B) in a membrane or film form doubling as a separator, wherein the gelled polymer electrolytes (A and B) both comprises a polyalkylene oxide based polymer impregnated with a liquid electrolyte. The inventive cell has a large contact surface area between an active material of the positive electrode and a gelled polymer electrolyte due to a specific gelled polymer electrolyte (A) contained in the positive electrode, which results in its having a large initial discharge capacity (especially, a high rate discharge capacity). Further, in the inventive cell, the manganese in the spinel type lithium manganate shows a reduced tendency to dissolve out, due to a specific gelled polymer electrolyte (B) used as an electrolyte, which results in the reduction of the decrease in discharge capacity caused by the dissolution of manganese in a charge-discharge cycle, that is, in the excellent charge-discharge cycle characteristics of the cell.

L'invention porte sur une batterie utilisant comme matériau actif du manganate de lithium en spinelles comprenant une électrode positive contenant un électrolyte (A) de gel de polymère, une électrode négative et un électrolyte (B) de gel de polymère dans une membrane ou dans un film de doublage servant de séparateur, les deux gels de polymère consistant tous deux en un polymère d'oxyde de polyalkylène imprégné par un électrolyte liquide. La batterie de l'invention présente une large surface de contact entre le matériau actif de l'électrode positive et l'électrolyte de gel de polymère en raison de la nature spécifique de l'électrolyte (A) de l'électrode positive d'où sa forte capacité initiale de décharge (spécialement à fort débit). De plus, le manganèse en spinelles tend peu à se dissoudre en raison de la nature spécifique de l'électrolyte (B), d'où une moindre décroissance de la capacité de décharge occasionnée par la dissolution du manganèse au cours d'un cycle de charge-décharge et d'excellentes caractéristiques dudit cycle.

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