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Title: Nonaqueous electrolyte for electrical storage devices

Abstract

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.

Inventors:
 [1];  [2]
  1. Melrose, MA
  2. Waltham, MA
Issue Date:
Research Org.:
Covalent Associates, Inc
OSTI Identifier:
872574
Patent Number(s):
5965054
Assignee:
Covalent Associates, Inc. (Woburn, MA)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
DOE Contract Number:  
FG02-96ER82149
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
nonaqueous; electrolyte; electrical; storage; devices; improved; electrolytes; application; electrochemical; capacitors; batteries; disclosed; contain; salts; consisting; alkyl; substituted; cyclic; delocalized; aromatic; cations; perfluoro; derivatives; polyatomic; anions; van; waals; volume; equal; 100; ang; preferably; inorganic; perfluoride; pf; dissolved; organic; liquids; carbonate; solvents; liquid; sulfur; dioxide; combinations; concentration; 5m; 0m; exemplary; comprise; 1-ethyl-3-methylimidazolium; hexafluorophosphate; acylic; methyl; formate; combination; therof; useful; characteristics; conductivity; energy; capabilities; power; compared; prior; stacked; capacitor; cells; permit; voltage; methyl formate; aqueous electrolyte; organic liquids; alkyl substituted; storage device; energy storage; sulfur dioxide; organic liquid; storage devices; electrochemical capacitors; electrical storage; nonaqueous electrolyte; electrochemical capacitor; improved electrolyte; /252/429/999/

Citation Formats

McEwen, Alan B, and Yair, Ein-Eli. Nonaqueous electrolyte for electrical storage devices. United States: N. p., 1999. Web.
McEwen, Alan B, & Yair, Ein-Eli. Nonaqueous electrolyte for electrical storage devices. United States.
McEwen, Alan B, and Yair, Ein-Eli. Fri . "Nonaqueous electrolyte for electrical storage devices". United States. https://www.osti.gov/servlets/purl/872574.
@article{osti_872574,
title = {Nonaqueous electrolyte for electrical storage devices},
author = {McEwen, Alan B and Yair, Ein-Eli},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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Works referenced in this record:

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