Solid state cell electrolyte

Details Solid state cell electrolyte Solid state cell electrolyte

1991-01-15

1992-02-04

Kalafut, Stephen J.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429197, H01M 1040

Patent

active

050859528

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: 4547440 (1985-10-01), Hooper et al.
patent: 4578326 (1986-03-01), Armand et al.
patent: 4740498 (1988-04-01), Lu
"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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