Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 19, Pages 4445-4450Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.03.032
Keywords
Graphite anodes; SEI layer; Fluoroethylene carbonate; XPS; DSC
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Funding
- Samsung SDI Corporation
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The influence of fluoroethylene carbonate (FEC) on the electrochemical and thermal properties of graphite anodes is examined. The dQ/dV graph of graphite/Li cells shows that the electrochemical reduction peak of an electrolyte shifts to higher potential in the presence of FEC. The DSC results for graphite anodes cycled in FEC-containing electrolytes clearly exhibit that an exothermic peak at around 120 degrees C mostly disappears. It is demonstrated by X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) that SEI formed by the electrochemical reduction of FEC consists of a relatively high proportion of LiF and gives low interfacial resistance for graphite/Li/Li cells. (C) 2009 Elsevier Ltd. All rights reserved.
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