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Authors
Yamaguchi, Kazuki Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University
Domi, Yasuhiro Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University Tottori University Researchers KAKEN Search Researchers
Usui, Hiroyuki Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University Tottori University Researchers KAKEN Search Researchers
Shimizu, Masahiro Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University
Morishita, Shota Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University
Yodoya, Shuhei Center for Research on Green Sustainable Chemistry, Tottori University / Course of Chemistry and Biotechnology, Department of Engineering, Graduate School of Sustainability Science, Tottori University
Sakata, Takuma Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University
Sakaguchi, Hiroki Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University Tottori University Researchers KAKEN Search Researchers
Keywords
Batteries - Lithium
ionic liquid electrolyte
Li-ion battery
Si negative electrode
Abstract
1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide (EMI-TFSA) is one of the promising ionic liquids as electrolyte solvent to enhance the electrochemical performance of Si electrode for Li-ion batteries (LIBs) because of its low viscosity and high conductivity. However, it has low stability against reduction and its reductive decomposition product inhibits Li+ insertion to electrodes, leading to poor cycling stability. To exert a potential of EMI-TFSA, we employed vinylene carbonate (VC) as film-forming additive. Si electrode exhibited very high cycling stability and rate capability in 20 vol.% VC-added EMI-TFSA-based electrolyte. In addition, by replacing TFSA anion with bis(fluorosulfonyl)amide (FSA) for Li salt and ionic liquid solvent, an excellent cycling performance and outstanding rate capability was achieved. VC cannot only fabricate a good surface film but also lower the interaction between Li+ and FSA-, providing smooth desolvation of FSA- to obtain better high-rate performance. Non-flammability of the VC-added electrolytes was confirmed by fire resistance test in closed-system: no ignition was observed even at 300°C. Consequently, we found that mixture electrolyte consisted of EMI-based ionic liquid and VC, especially 1 M LiFSA/EMI-FSA with 20 vol.% VC, is a prospective candidate for simultaneously enhancing the electrochemical performance of Si electrode as well as safety of LIBs.
Publisher
The Electrochemical Society
Content Type
Journal Article
Link
ISSN・ISBN
00134651
NCID
AA00697016
Journal Title
Journal of the Electrochemical Society
Volume
166
Issue
2
Start Page
A268
End Page
A276
Published Date
2019-01-28
Publisher-DOI
Text Version
Publisher
Rights
© The Author(s) 2019. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.
Citation
This research was published by Elsevier: YAMAGUCHI, Kazuki, et al. Effect of Film-Forming Additive in Ionic Liquid Electrolyte on Electrochemical Performance of Si Negative-Electrode for LIBs. Journal of The Electrochemical Society, 2019, 166.2: A268-A276. https://doi.org/10.1149/2.0971902jes
Department
Faculty of Engineering/Graduate School of Engineering
Language
English