Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 158, Issue 7, Pages A798-A801Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3589300
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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. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3589300] All rights reserved.
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