Polymer electrolyte material for use in lithium and lithium ion

Details Polymer electrolyte material for use in lithium and lithium ion Polymer electrolyte material for use in lithium and lithium ion

1997-07-24

1999-02-23

Maples, John S.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

H01M 1040, H01M 1036

Patent

active

058741852

ABSTRACT:
A polymer electrolyte for use in lithium batteries is disclosed. It contains: (a) a poly(vinyl chloride-co-vinyl acetate), or PVCAC, which is a copolymer containing 5 to 25 mol % of a vinyl chloride monomer, and 75 to 95 mol % of a vinyl acetate monomer; (b) a lithium salt; and (c) an organic solvent mixture. The organic solvent mixture contains at least one component selected from the group consisting of EC and PC and a high-boiling-point organic solvent. Preferably, the amount of the PVCAC is about 16-40 mol % of the polymer electrolyte, lithium about 3-12 mol %, and the organic solvent mixture about 48-81 mol %, when the polymer electrolyte was freshly prepared. Preferrably, the high-boiling-point is DMF or NMP. Within the organic solvent mixture, if DMF is used, it should preferably be about 20-60 mol % of the total organic solvent mixture. If NMP is used, it should preferably be about 10-40 mol % of the total organic solvent mixture.

REFERENCES:
patent: 4216073 (1980-08-01), Goldstein
patent: 4496638 (1985-01-01), Sugiuch et al.
patent: 5252413 (1993-10-01), Alamgir et al.

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