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Electrolytes with Improved Safety Developed for High Specific Energy Li-Ion Cells with Si-Based AnodesA number of electrolyte formulations that have improved safety characteristics have been developed for use with high capacity silicon-based anodes. To improve the compatibility with Si-based anodes, a number of technical approaches have been employed, including: (1) the use of mono-fluoroethylene carbonate (FEC) in conjunction with, or in lieu of, ethylene carbonate (EC), (2) the use of high proportions of fluorinated co-solvents, (3) the use of vinylene carbonate (VC) to stabilize the Si/C electrode, and (4) the use of lithium bis(oxalato)borate (LiBOB) to improve the compatibility of the electrolyte when Si/C electrodes are used in conjunction with high voltage cathodes. Candidate electrolytes were studied in Li/Si-C and Si-C/ Li(MnNiCo)O2 (NMC) coin cells, as well as in larger Si-C/NMC three-electrode cells equipped with lithium reference electrodes. In summary, many electrolytes that contain triphenyl phosphate (TPP), which is used as a flame retardant additive up to concentrations of 15 volume percent, and possess FEC as a co-solvent have been demonstrated to outperform the all-carbonate baseline electrolytes when evaluated in Si-C/ Li(MnNiCo)O2 cells.
Document ID
20150008721
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Smart, M. C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Krause, F. C.
(University of Southern California Los Angeles, CA, United States)
Hwang, C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Soler, J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
West, W. C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ratnakumar, B. V.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Prakash, G. K. S.
(University of Southern California Los Angeles, CA, United States)
Date Acquired
May 21, 2015
Publication Date
October 7, 2012
Subject Category
Energy Production And Conversion
Inorganic, Organic And Physical Chemistry
Meeting Information
Meeting: Meeting of the Electrochemical Society (ECS)
Location: Honolulu, HI
Country: United States
Start Date: October 7, 2012
End Date: October 12, 2012
Sponsors: Electrochemical Society, Inc.
Distribution Limits
Public
Copyright
Other
Keywords
Silicon-Based Anode
Li-Ion Electrolytes

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