Nonaqueous electrolyte for electrical storage devices

McEwen, Alan B; Yair, Ein-Eli

Title: Nonaqueous electrolyte for electrical storage devices

Patent · Fri Jan 01 00:00:00 EST 1999

OSTI ID:872574

McEwen, Alan B ^[1]; Yair, Ein-Eli ^[2]

Melrose, MA
Waltham, MA

Improved nonaqueous electrolytes for application in electrical storage devices such as electrochemical capacitors or batteries are disclosed. The electrolytes of the invention contain salts consisting of alkyl substituted, cyclic delocalized aromatic cations, and their perfluoro derivatives, and certain polyatomic anions having a van der Waals volume less than or equal to 100 .ANG..sup.3, preferably inorganic perfluoride anions and most preferably PF.sub.6.sup.-, the salts being dissolved in organic liquids, and preferably alkyl carbonate solvents, or liquid sulfur dioxide or combinations thereof, at a concentration of greater than 0.5M and preferably greater than 1.0M. Exemplary electrolytes comprise 1-ethyl-3-methylimidazolium hexafluorophosphate dissolved in a cyclic or acylic alkyl carbonate, or methyl formate, or a combination therof. These improved electrolytes have useful characteristics such as higher conductivity, higher concentration, higher energy storage capabilities, and higher power characteristics compared to prior art electrolytes. Stacked capacitor cells using electrolytes of the invention permit high energy, high voltage storage.

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Research Organization:: Covalent Associates, Inc

DOE Contract Number:: FG02-96ER82149

Assignee:: Covalent Associates, Inc. (Woburn, MA)

Patent Number(s):: US 5965054

OSTI ID:: 872574

Country of Publication:: United States

Language:: English

References (15)

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nonaqueous
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/252/429/999/

Title: Nonaqueous electrolyte for electrical storage devices

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References (15)

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