Capacitor having an electrolyte containing a mixture of dinitril

Details Capacitor having an electrolyte containing a mixture of dinitril Capacitor having an electrolyte containing a mixture of dinitril

1994-06-16

1995-05-23

Reynolds, Bruce A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Double layer electrolytic capacitor

361504, 361505, 252 622, H01G 9038, H01G 9035

Patent

active

054186820

ABSTRACT:
An electrical capacitor includes an organic electrolyte to provide high power, high energy density, and broad operating temperature range. The capacitor includes electrodes and an electrolyte system comprising a salt combined with a solvent containing a nitrile. The electrolyte system is selected to be relatively nonreactive and difficult to oxidize or reduce so as to produce a high electric potential range. As examples, the electrolyte may include a solvent selected from the group consisting of acetonitrile, succinonitrile, glutaronitrile, propylene carbonate, and ethylene carbonate; a salt cation selected from the group consisting of tetraalkylamonium (R.sub.4 N.sup.+) and alkali metals; and an anion selected from the group consisting of trifluoromethylsulfonate (CF.sub.3 SO.sub.3.sup.-), bistrifluoromethylsulfurylimide (N(CF.sub.3 SO.sub.2).sub.2.sup.-), tristrifluoromethylsulfurylcarbanion (C(CF.sub.3 SO.sub.2).sub.3.sup.-), tetrafluoroborate (BF.sub.4.sup.-), hexafluorophosphate (PF.sub.6.sup.-), hexafluoroarsenate (AsF.sub.6.sup.-), and perchlorate (ClO.sub.4.sup.-).

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