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Low molecular weight salts combined with fluorinated solvents for electrolytes

  • US 9,184,467 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:

  • a low molecular weight first electrolyte salt having a high salt concentration of at least 0.5 M and a molecular weight less than about 250 grams per mole, wherein the first electrolyte salt comprises one of LiPF6, LiBF4, LiClO4, LiBOB, or LiN(SO2F)2;

    a non-fluorinated linear carboxylic acid ester; and

    one or more fluorinated solvents to include 1,1,1,2,3,3-hexafluoro-4-(1,1,2,3,3,3-hexafluoropropoxy)-pentane, the one or more fluorinated solvents being over 30% by weight of the electrolyte, excluding any electrolyte salt;

    wherein the low molecular weight first electrolyte salt at the high salt concentration is soluble in the electrolyte; and

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

    30°

    C.

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