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Combinations of fluorinated solvents with imide salts or methide salts for electrolytes

  • US 9,184,468 B2
  • Filed: 06/04/2013
  • Issued: 11/10/2015
  • Est. Priority Date: 06/19/2012
  • Status: Expired due to Fees
First Claim
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1. An electrolyte for use in an electrochemical cell, the electrolyte comprising:

  • an electrolyte salt including an imide or methide having at least one fluorinated alkyl group of 1 to 8 carbon atoms; and

    a non-fluorinated carboxylic acid ester wherein the non-fluorinated carboxylic acid ester is selected from a group consisting of methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, methyl butyrate, and ethyl butyrate, and a fluorinated solvent selected from a group consisting of 1-methoxyheptafluoropropane, methyl nonafluorobutyl ether, ethyl nonafluorobutyl ether, 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)-pentane, 3-ethoxy-1,1,1,2,3,4,4,5,5,6,6,6-dodecafluoro-2-trifluoromethyl-hexane, and 1,1,1,2,3,3-hexafluoro-4-(1,1,2,3,3,3-hexafluoropropoxy)-pentane, the fluorinated solvent being over 30% by weight of the electrolyte excluding the electrolyte salt;

    wherein the electrolyte is a one-phase solution at a temperature of about −

    30°

    C.

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