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Article
Effects of Fluoroethylene Carbonate (FEC) on Anode and Cathode Interfaces At Elevated Temperatures
Journal of The Electrochemical Society
  • Hosop Shin
  • Jonghyun Park, Missouri University of Science and Technology
  • Ann Marie Sastry
  • Wei Lu
Abstract

The use of electrolyte additives is one of the most effective and economical ways to improve battery performance by stabilizing the electrode/electrolyte interface. In this work, we identified that fluoroethylene carbonate (FEC), which is one of the important electrolyte additives, had different impacts on anode and cathode, by investigating a graphite anode and a LiMn2O4 cathode through electrochemical analyses at room and elevated temperatures. In the anode side, the solid electrolyte interphase (SEI) layer derived from FEC exhibited a lower interfacial resistance and excellent thermal stability, showing excellent rate capability and improved cycle retention of cells. In contrast, poor cycling retention and a rapid increase in the interfacial resistance of the cathode were observed at elevated temperature. The poorer performance of the cathode in the FEC-containing cell at elevated temperature was attributed to the formation of a thicker surface layer and to increased Mn dissolution catalyzed by HF, which resulted from FEC dehydrofluorination initiated or accelerated by elevated temperature. Accordingly, it is suggested that the amount of FEC in a full cell must be optimized to minimize the adverse effects of FEC on cathode.

Department(s)
Mechanical and Aerospace Engineering
Research Center/Lab(s)
Center for High Performance Computing Research
International Standard Book Number (ISBN)
0013-4651
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2015 The Electrochemical Society, All rights reserved.
Publication Date
1-1-2015
Citation Information
Hosop Shin, Jonghyun Park, Ann Marie Sastry and Wei Lu. "Effects of Fluoroethylene Carbonate (FEC) on Anode and Cathode Interfaces At Elevated Temperatures" Journal of The Electrochemical Society Vol. 162 Iss. 9 (2015) p. A1683 - A1692
Available at: http://works.bepress.com/jonghyun-park/5/