High cycle life secondary lithium battery

Chemistry: electrical current producing apparatus – product – and – Plural concentric or single coiled electrode

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429194, 429250, 429254, 427243, H01M 400

Patent

active

045500649

ABSTRACT:
A secondary battery (10) of high energy density and long cycle is achieved by coating the separator (18) with a film (21) of cationic polymer such as polyvinyl-imidazoline. The binder of the positive electrode (14) such as an ethylene-propylene elastomer binder (26) containing particles (28) of TiS.sub.2 chalcogenide can also be modified to contain sulfone functional groups by incorporating liquid or solid sulfone materials such as 0.1 to 5 percent by weight of sulfolane into the binder. The negative lithium electrode (14), separator (18) and positive electrode (16) are preferably spirally wound and disposed within a sealed casing (17) containing terminals (32, 34). The modified separator and positive electrode are more wettable by the electrolytes in which a salt is dissolved in a polar solvent such as sulfolane.

REFERENCES:
patent: 3472700 (1969-10-01), Kollman et al.
patent: 3798197 (1974-03-01), Naschivitz et al.
patent: 4217404 (1980-08-01), Verzwyvelt
patent: 4252878 (1981-02-01), Lazarz et al.
patent: 4299892 (1981-11-01), Dines et al.
patent: 4322317 (1982-03-01), Rao et al.
patent: 4396687 (1983-08-01), Kummer
patent: 4438185 (1984-03-01), Toskier
S. P. S. Yen, D. H. Shen, R. B. Somoano, "Elastomeric Binders for Electrodes," J. Electrochem Soc.: Electrochemical Science and Technology, May 1983, pp. 1107-1109.

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