Solid state cell electrolyte

Details Solid state cell electrolyte Solid state cell electrolyte

1991-11-15

1993-02-02

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429197, H01M 614

Patent

active

051837153

ABSTRACT:
A solid polymer electrolyte for a solid state electrochemical cell comprises a complex of a solid polymer such as poly(ethene oxide) and an alkali metal salt such as LiClO.sub.4, which polymer is capable of forming donor: acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, the complex being associated with a mixture of more than one 1,3-dioxolane-2-ones, for example ethylene carbonate and propylene carbonate, such that the electrolyte possesses satisfactory ambient temperature ionic conductivity (e.g. 10.sup.-3 to 10.sup.-4 ohm.sup.-1 cm.sup.-1) and a cell including the electrolyte substantially maintains its discharge capacity at ambient temperature after repeated charge/discharge cycling.

REFERENCES:
patent: 4740433 (1988-04-01), Ly
patent: 4753859 (1988-06-01), Brand et al.
patent: 5041346 (1991-08-01), Giles
McLoughlin et al., Chemical Abstracts, vol. 106, No. 21099, Jan. 26, 1987.
"Ethylene Carbonate-Propylene Carbonate Mixed Electrolytes for Lithium Batteries", S. Tobishima et al., Electrochimica Acta. vol. 29, No. 2, pp. 267-271, 1984.

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