Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer – spacer or materials for use therewith
Patent
1993-08-23
1995-05-23
Maples, John S.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer, spacer or materials for use therewith
429254, H01M 216
Patent
active
054180910
ABSTRACT:
A flexible polymeric film useful as an interelectrode separator or electrolyte member in electrolytic devices, such as rechargeable batteries, comprises a copolymer of vinylidene fluoride with 8 to 25% hexafluoropropylene. The film may be cast or formed as a self-supporting layer retaining about 20% to 70% of a high-boiling solvent or solvent mixture comprising such solvents as ethylene carbonate, propylene carbonate, dimethyl carbonate, and dibutyl phthalate. The film may be used in such form or after leaching of the retained solvent with a film-inert low-boiling solvent to provide a separator member into which a solution of electrolytic salt is subsequently imbibed to displace retained solvent or replace solvent previously leached from the polymeric matrix.
REFERENCES:
patent: 4468441 (1984-08-01), D'Agostino
Feuillade, G, "Ion-Conductive Macromolecular Gels and Membranes . . .," J. Appl. Electrochem., 5 (May, 1975), pp. 63-69.
Gozdz Antoni S.
Schmutz Caroline N.
Tarascon Jean-Marie
Warren Paul C.
Bell Communications Research Inc.
Maples John S.
Suchyta Leonard Charles
White Lionel N.
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