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Electrochemical performance of Sn4P3 negative electrode for Na-ion batteries in ether-substituted ionic liquid electrolyte 薄井, 洋行 4098 ウスイ, ヒロユキ 60423240 Usui, Hiroyuki 100000473 道見, 康弘 254 ドウミ, ヤスヒロ 50576717 Domi, Yasuhiro 100001303 野上, 敏材 2693 ノカミ, トシキ 60402963 Nokami, Toshiki 100000941 伊藤, 敏幸 1108 イトウ, トシユキ 50193503 Itoh, Toshiyuki 100000464 坂口, 裕樹 3101 サカグチ, ヒロキ 00202086 Sakaguchi, Hiroki 100000517 Yamaguchi, Kazuki 26932 Nishida, Haruka 26933 Komura, Takuro 26934 Tin phosphide Na-ion battery Ionic liquid electrolyte Ether-substitution Tin phosphide Na-ion battery Ionic liquid electrolyte Ether-substitution We have previously disclosed that the ionic-liquid electrolyte sodium bis(fluorosulfonyl)amide (NaFSA)/1-methyl-1-propylpyrrolidinium bis(fluorosulfonyl)amide (Py13-FSA) can significantly improve the cycling stability of Sn4P3 negative electrodes for Na-ion batteries (NIBs). However, the strong electrostatic interaction between Na+ and FSA− in the electrolyte leads to high viscosity and low conductivity. In this study, we have tried to improve the conductivity of the electrolyte and enhance the rate capability of the Sn4P3 electrode by introducing an ether group in the side-chain of the ionic liquid cation to reduce said electrostatic interaction. Ether-substituted ionic liquid 1-methoxymethyl-1-methylpyrrolidinium (PyMOM)-FSA showed higher conductivity than Py13-FSA and the Sn4P3 electrode exhibited a higher rate capability. The differential capacity vs. potential plots suggest that the reaction between Na+ and Sn or P is promoted in the ether-substituted ionic liquid electrolyte. These results demonstrate that introduction of an ether moiety is an effective approach to improve the rate capability of the Sn4P3 electrode in NIBs. journal article Elsevier 2019-07-15 AM application/pdf Journal of Electroanalytical Chemistry 845 66 71 Journal of Electroanalytical Chemistry 15726657 https://repository.lib.tottori-u.ac.jp/record/7258/files/jec845_66.pdf https://repository.lib.tottori-u.ac.jp/records/7258 eng 10.1016/j.jelechem.2019.05.047 Yamaguchi, Kazuki. Usui, Hiroyuki. Domi, Yasuhiro. et al. Electrochemical performance of Sn4P3 negative electrode for Na-ion batteries in ether-substituted ionic liquid electrolyte. Journal of Electroanalytical Chemistry. 845. 66-71. 2019-07-15. doi:10.10 https://www.sciencedirect.com/science/article/pii/S1572665719304035 https://www.sciencedirect.com/science/article/pii/S1572665719304035 (C) 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/