Investigation of the Solid Electrolyte Interphase Formed by Fluoroethylene Carbonate on Si Electrodes
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- 5 May 2011
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 158 (7), A798-A801
- https://doi.org/10.1149/1.3589300
Abstract
The solid electrolyte interphase (SEI) formed by a fluoroethylene carbonate (FEC)-based electrolyte on a Si electrode was investigated using X-ray photoelectron spectroscopy (XPS) and time of flight–secondary ion mass spectrometry (ToF-SIMS). The FEC-derived SEI consists of lithium fluoride and a polyene-compound, which are originated from free fluoride and the acetylene unit due to the preferential reaction of FEC, and is very thin. Oxidation of the Si electrode of the EC-based cell was confirmed, although it did not proceed to a significant extent. The FEC-derived SEI protects against not only the decomposition of the FEC-based electrolyte, but also oxidation of the Si electrode. The FEC-derived SEI acts as a passivation film for the Si electrode, which results in the improvement of the cycling performance.Keywords
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