Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 16, Pages 6794-6801Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.10.050
Keywords
Lithium difluoro(oxalate)borate; Electrolyte additive; Thermal stability; Elevated temperature; Lithium-ion battery
Funding
- National Natural Science Foundation of China [NSFC20873046, NSFC21003054]
- Natural Science Foundation of Guangdong Province [10351063101000001]
- Specialized Research Fund for the Doctoral Program of Higher Education [200805740004]
- Project of Guangdong Province [2009B050700039]
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Lithium difluoro (oxalate) borate (LiDFOB) is used as thermal stabilizing and solid electrolyte interface (SEI) formation additive for lithium-ion battery. The enhancements of electrolyte thermal stability and the SEIs on graphite anode and LiFePO4 cathode with LiDFOB addition are investigated via a combination of electrochemical methods, nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared-attenuated total reflectance (FTIR-ATR), as well as density functional theory (DFT). It is found that cells with electrolyte containing 5% LiDFOB have better capacity retention than cells without LiDFOB. This improved performance is ascribed to the assistance of LiDFOB in forming better SEIs on anode and cathode and also the enhancement of the thermal stability of the electrolyte. LiDFOB-decomposition products are identified experimentally on the surface of the anode and cathode and supported by theoretical calculations. (C) 2010 Elsevier B.V. All rights reserved.
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