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

Provided are electrochemical cells and electrolytes used to build such cells. The electrolytes include imide salts and/or methide salts as well as fluorinated solvents capable of maintaining single phase solutions at between about -30.degree. C. to about 80.degree. C. The fluorinated solvents, such as fluorinated carbonates, fluorinated esters, and fluorinated esters, are less flammable than their non-fluorinated counterparts and improve 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. Linear and cyclic imide salts, such as LiN(SO.sub.2CF.sub.2CF.sub.3).sub.2, and LiN(SO.sub.2CF.sub.3).sub.2, as well as methide salts, such as LiC(SO.sub.2CF.sub.3).sub.3 and LiC(SO.sub.2CF.sub.2CF.sub.3).sub.3, may be used in these electrolytes. Fluorinated alkyl groups enhance solubility of these salts in the fluorinated solvents. In some embodiments, the electrolyte may also include a flame retardant, such as a phosphazene, and/or one or more ionic liquids.
Inventors:
; ; ; ; ;
Issue Date:
OSTI Identifier:
1225523
Assignee:
A123 Systems LLC CHO
Patent Number(s):
9,184,468
Application Number:
13/910,105
Contract Number:
SC0005117
Resource Relation:
Patent File Date: 2013 Jun 04
Research Org:
A123 Systems, LLC , Waltham, MA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION

Works referenced in this record:

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

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