skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fluoroalkyl containing salts combined with fluorinated solvents for electrolytes

Abstract

Provided are electrochemical cells and electrolytes used to build such cells. An electrolyte may include a fluoroalkyl-substituted LiPF.sub.6 salt or a fluoroalkyl-substituted LiBF.sub.4 salt. In some embodiments, at least one fluorinated alkyl of the salt has a chain length of from 1 to 8 or, more specifically, between about 2 and 8. These fluorinated alkyl groups, in particular, relatively large fluorinated alkyl groups improve solubility of these salts in fluorinated solvents that are less flammable than, for example, conventional carbonate solvents. At the same time, the size of fluoroalkyl-substituted salts should be limited to ensure adequate concentration of the salt in an electrolyte and low viscosity of the electrolyte. In some embodiments, the concentration of a fluoroalkyl-substituted salt is at least about 0.5M. Examples of fluorinated solvents include various fluorinated esters, fluorinated ethers, and fluorinated carbonates, such a 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.

Inventors:
; ; ;
Issue Date:
Research Org.:
A123 Systems LLC, Waltham, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1178257
Patent Number(s):
9,012,094
Application Number:
13/910,108
Assignee:
A123 Systems LLC (Waltham, MA)
DOE Contract Number:  
SC0005117
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Jun 04
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Tikhonov, Konstantin, Yip, Ka Ki, Lin, Tzu-Yuan, and Erickson, Michael Jason. Fluoroalkyl containing salts combined with fluorinated solvents for electrolytes. United States: N. p., 2015. Web.
Tikhonov, Konstantin, Yip, Ka Ki, Lin, Tzu-Yuan, & Erickson, Michael Jason. Fluoroalkyl containing salts combined with fluorinated solvents for electrolytes. United States.
Tikhonov, Konstantin, Yip, Ka Ki, Lin, Tzu-Yuan, and Erickson, Michael Jason. Tue . "Fluoroalkyl containing salts combined with fluorinated solvents for electrolytes". United States. https://www.osti.gov/servlets/purl/1178257.
@article{osti_1178257,
title = {Fluoroalkyl containing salts combined with fluorinated solvents for electrolytes},
author = {Tikhonov, Konstantin and Yip, Ka Ki and Lin, Tzu-Yuan and Erickson, Michael Jason},
abstractNote = {Provided are electrochemical cells and electrolytes used to build such cells. An electrolyte may include a fluoroalkyl-substituted LiPF.sub.6 salt or a fluoroalkyl-substituted LiBF.sub.4 salt. In some embodiments, at least one fluorinated alkyl of the salt has a chain length of from 1 to 8 or, more specifically, between about 2 and 8. These fluorinated alkyl groups, in particular, relatively large fluorinated alkyl groups improve solubility of these salts in fluorinated solvents that are less flammable than, for example, conventional carbonate solvents. At the same time, the size of fluoroalkyl-substituted salts should be limited to ensure adequate concentration of the salt in an electrolyte and low viscosity of the electrolyte. In some embodiments, the concentration of a fluoroalkyl-substituted salt is at least about 0.5M. Examples of fluorinated solvents include various fluorinated esters, fluorinated ethers, and fluorinated carbonates, such a 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {4}
}

Patent:

Save / Share:

Works referenced in this record:

Nonflammable Methyl Nonafluorobutyl Ether for Electrolyte Used in Lithium Secondary Batteries
journal, January 2003

  • Arai, Juichi
  • Journal of The Electrochemical Society, Vol. 150, Issue 2
  • DOI: 10.1149/1.1538224

Binary Mixed Solvent Electrolytes Containing Trifluoropropylene Carbonate for Lithium Secondary Batteries
journal, January 2002

  • Arai, Juichi; Katayama, Hideaki; Akahoshi, Haruo
  • Journal of The Electrochemical Society, Vol. 149, Issue 2
  • DOI: 10.1149/1.1433749

Hydrofluoroether electrolytes for lithium-ion batteries: Reduced gas decomposition and nonflammable
journal, October 2011


Discharge Behavior and Rate Performances of Lithium-Ion Batteries in Nonflammable Hydrofluoroethers(II)
journal, January 2010

  • Naoi, Katsuhiko; Iwama, Etsuro; Honda, Yoki
  • Journal of The Electrochemical Society, Vol. 157, Issue 2
  • DOI: 10.1149/1.3265475

Nonflammable Hydrofluoroether for Lithium-Ion Batteries: Enhanced Rate Capability, Cyclability, and Low-Temperature Performance
journal, January 2009

  • Naoi, Katsuhiko; Iwama, Etsuro; Ogihara, Nobuhiro
  • Journal of The Electrochemical Society, Vol. 156, Issue 4, p. A272-A276
  • DOI: 10.1149/1.3073552