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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):
9012094
Application Number:
13/910,108
Assignee:
A123 Systems LLC (Waltham, MA)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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
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}
}

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