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Electrolytes including fluorinated solvents for use in electrochemical cells

United States Patent

July 7, 2015
View the Complete Patent at the US Patent & Trademark Office
Provided are electrochemical cells and electrolytes used to build such cells. The electrolytes include ion-supplying salts and fluorinated solvents capable of maintaining single phase solutions with the salts at between about C. to about C. The fluorinated solvents, such as fluorinated carbonates, fluorinated esters, and fluorinated esters, are less flammable than their non-fluorinated counterparts and increase safety characteristics of cells containing these solvents. The amount of fluorinated solvents in electrolytes may be between about 30% and 80% by weight not accounting weight of the salts. Fluorinated salts, such as fluoroalkyl-substituted LiPF.sub.6, fluoroalkyl-substituted LiBF.sub.4 salts, linear and cyclic imide salts as well as methide salts including fluorinated alkyl groups, may be used due to their solubility in the fluorinated solvents. In some embodiments, the electrolyte may also include a flame retardant, such as a phosphazene or, more specifically, a cyclic phosphazene and/or one or more ionic liquids.
Tikhonov; Konstantin (Pleasanton, CA), Yip; Ka Ki (San Leandro, CA), Lin; Tzu-Yuan (San Jose, CA)
A123 Systems LLC (Waltham, MA)
13/ 909,014
June 3, 2013
GOVERNMENT LICENSE RIGHTS This invention was made with government support under DE-SC0005117 awarded by the Department of Energy. The government has certain rights in the invention.