Capacitor having an electrolyte containing a mixture of dinitriles
First Claim
1. An electrical capacitor, comprising:
- a pair of electrodes separated by an electrolyte; and
said electrolyte comprising a salt and a solvent containing succinonitrile mixed with a second dinitrile to form a liquid at room temperature.
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Accused Products
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 (R4 N+) and alkali metals; and an anion selected from the group consisting of trifluoromethylsulfonate (CF3 SO3-), bistrifluoromethylsulfurylimide (N(CF3 SO2)2-), tristrifluoromethylsulfurylcarbanion (C(CF3 SO2)3-), tetrafluoroborate (BF4-), hexafluorophosphate (PF6-), hexafluoroarsenate (AsF6-), and perchlorate (ClO4-).
41 Citations
16 Claims
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1. An electrical capacitor, comprising:
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a pair of electrodes separated by an electrolyte; and said electrolyte comprising a salt and a solvent containing succinonitrile mixed with a second dinitrile to form a liquid at room temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrolytic capacitor, comprising:
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a pair of electrodes separated by an electrolyte; at least one of said electrodes having an oxide layer; and said electrolyte comprising a salt and a solvent containing succinonitrile mixed with a second dinitrile to form a liquid at room temperature. - View Dependent Claims (9, 10, 11, 12)
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13. An electrochemical double layer capacitor, comprising:
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a pair of electrodes separated by an organic electrolyte; said electrodes comprising a material selected from the group consisting of carbon foams, carbon fibers, carbon composites, metal filled composites, metals, and conductive metal oxides; and said electrolyte including a solvent containing succinonitrile mixed with a second dinitrile to form a liquid at room temperature and a salt comprising a cation and an anion. - View Dependent Claims (14, 15, 16)
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Specification