Non-aqueous electrolyte secondary battery

Details Non-aqueous electrolyte secondary battery Non-aqueous electrolyte secondary battery

1991-09-27

1993-12-21

Willis, Jr., Prince

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429194, 429210, 429213, 429218, H01M 1040

Patent

active

052720225

ABSTRACT:
A nonaqueous electrolyte secondary battery having an enhanced capacity and a long charge/discharge cycle life is disclosed. The nonaqueous electrolyte secondary battery comprises a positive electrode housed in a case and containing a chalcogen compound as an active material, a negative electrode arranged in the case such that a separator is sandwiched between the positive and negative electrodes and containing a carbonaceous material as an active material that absorbs and discharges lithium ions and a nonaqueous electrolyte contained in the case and prepared by dissolving 0.5 mol/l to 1.5 mol/l of electrolytic salt selected from the group consisting of LiPF.sub.6, LiBF.sub.4, LiAsF.sub.6 and LiCF.sub.3 SO.sub.3 in a solvent mixture comprising at least one first nonaqueous solvent selected from the group consisting of noncyclic carbonate, cyclic carbonate, .gamma.-butyrolactone and acetonitrile and at least one second nonaqueous solvent containing selected from the group consisting of 1,2-diethoxyethane, 1,2-dimethoxyethane, 1,2-ethoxymethoxyethane, 1,3-dimethoxypropane, diethylether and tetrahydrofurane, the amount of said second nonaqueous solvent in the solvent mixture being so determined that the mol ratio ([S]/[Li]) of the second nonaqueous solvent [S]to lithium ions [Li]is 0.5 to 3.

REFERENCES:
patent: 4668595 (1987-05-01), Yoshino et al.
patent: 4702977 (1987-10-01), Hiratsuka et al.
patent: 4957833 (1990-09-01), Daifuku et al.
J. Electrochem. Soc., vol. 137, No. 7, Jul. 1990, pp. 2009-2013, Fong et al: Studies of Lithium Intercalation into Carbons . . . .

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