Electrolyte system for electrolytic capacitors

Details Electrolyte system for electrolytic capacitors Electrolyte system for electrolytic capacitors

1983-02-18

1984-05-08

Cooper, Jack

Compositions

Electrolytes for electrical devices

361433, H01G 902

Patent

active

044473460

ABSTRACT:
An essentially non-aqueous electrolyte composition for aluminum-anode capacitors is disclosed comprising ethylene glycol and a salt such as the ammonium or amine salt of an unsaturated dicarboxylic acid with or without a small amount of an additive such as boric acid, phosphoric acid, ammonium dihydrogen phosphate, ammonium pentaborate, ammonium phosphate and mixtures thereof. The electrolyte offers high electrical conductivity, and greatly increased stability and shelf life, under conditions of no voltage, for low voltage capacitors having high capacitance ratings. In one embodiment, the combination of ethylene glycol, as the solvent, with between about 0.001 to 0.1 mole of unsaturated dicarboxylic acid per mole of ethylene glycol and about 0.001 to 0.1 mole of the salt per mole of ethylene glycol is used. Other embodiments are disclosed.

REFERENCES:
patent: 3518499 (1970-06-01), Shepherd et al.
patent: 3547423 (1970-12-01), Jenny et al.
patent: 3812039 (1974-05-01), Niwa
patent: 3835055 (1974-09-01), Chesnot

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