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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 / Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science
Domi, Yasuhiro Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University / Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science 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 / Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science Tottori University Researchers KAKEN Search Researchers
Sakaguchi, Hiroki Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University / Center for Research on Green Sustainable Chemistry, Tottori University / Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science Tottori University Researchers KAKEN Search Researchers
Keywords
Lithium-ion battery
Silicon
Ionic liquid
energy storage
high capacity
NDC
Technology. Engineering
Abstract
Excellent cycling performance of an electrode composed of silicon alone was achieved in a bis(fluorosulfonyl)amide (FSA)‐based electrolyte, with a high discharge capacity of 950 mA h g−1 observed even at the 500th cycle. To elucidate the reaction behavior of the Si electrode in an FSA‐based ionic liquid electrolyte, we investigated the change in the cross‐sectional morphology of the Si‐active material layer, the distribution of Li in the layer, and the crystallinity of Si on the electrode surface. By cross‐sectional scanning electron microscopy, we confirmed that the electrode thickness increased with the cycle number. The increase in thickness was less noticeable in the FSA‐based electrolyte than in an organic electrolyte. An elemental analysis of the electrode material revealed that a film derived from the electrolyte was formed not only on the surface but also inside of the electrode. Soft X‐ray emission spectroscopy demonstrated that the distribution of Li in the FSA‐based electrolyte was more uniform for the cross‐section of the cycled electrode compared to that in an organic electrolyte. The results of Raman spectroscopy indicated that domains of amorphous Si were homogeneously distributed on the electrode surface in the FSA‐based electrolyte. The uniform distribution of the lithiation−delithiation reaction should help to suppress disintegration of the active material layer.
Publisher
Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
Content Type
Journal Article
Link
ISSN・ISBN
2196-0216
Journal Title
ChemElectroChem
Current Journal Title
ChemElectroChem
Volume
4
Issue
12
Start Page
3257
End Page
3263
Published Date
2017-09-12
Publisher-DOI
Text Version
Author
Rights
© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
Citation
This is the peer reviewed version of the following article: K. Yamaguchi, Y. Domi, H. Usui, H. Sakaguchi, Citation for: Elucidation of the Reaction Behavior of Silicon Negative Electrodes in a Bis(fluorosulfonyl)amide‐Based Ionic Liquid Electrolyte. ChemElectroChem 2017, 4, 3257. , which has been published in final form at https://doi.org/10.1002/celc.201700724. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Department
Faculty of Engineering/Graduate School of Engineering
Language
English