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Effect of Cation Structure of Ionic Liquids on Anode Properties of Si Electrodes for LIB Shimizu, Masahiro 60423240 Usui, Hiroyuki Usui, Hiroyuki Matsumoto, Kuninobu 60402963 Nokami, Toshiki Nokami, Toshiki 50193503 Itoh, Toshiyuki Itoh, Toshiyuki 00202086 Sakaguchi, Hiroki Sakaguchi, Hiroki Shimizu, Masahiro Matsumoto, Kuninobu © 2014 The Electrochemical Society. [DOI: 10.1149/2.0021412jes] All rights reserved. Ionic liquids consisted of 1-((2-methoxyethoxy)methyl)-1-methylpiperidinium (PP1MEM) or 1-hexyl-1-methylpiperidinium (PP16) and bis(trifluoromethanesulfonyl)amide (TFSA) were applied to an electrolyte for Li-ion battery. The effect of their cation structure on anode properties of Si electrodes were investigated through the use of thick film prepared by gas-deposition without any binder and conductive additive. The Si electrode in PP1MEM-TFSA exhibited an initial reversible capacity of 2670 mA h g−1, which is larger than that in PP16-TFSA by ca. 900 mA h g−1. Moreover, a comparatively high capacity of 1150 mA h g−1 at a high current density of 4200 mA g−1 is achieved in PP1MEM-TFSA whereas the Si electrode in PP16-TFSA showed the capacity of only 210 mA h g−1. Raman analysis and electrochemical impedance measurements revealed that PP1MEM cation played a role reducing the interaction between Li ion and TFSA anions, and that Li-ion transfer at the electrode−electrolyte interface in PP1MEM-TFSA was remarkably improved compared with PP16-TFSA. These results indicate that the excellent performances obtained in PP1MEM-TFSA originate from a smooth Li-insertion into Si electrode. It was suggested that introduction of ether functional group into cation is valid to enhance the electrode performance. The Electrochemical Society 2014-08-08 eng journal article VoR https://repository.lib.tottori-u.ac.jp/records/7284 10.1149/2.0021412jes Journal of the Electrochemical Society. 2014, 161(12), A1765-A1771 http://jes.ecsdl.org/content/161/12/A1765 http://jes.ecsdl.org/content/161/12/A1765 AA00697016 00134651 Journal of the Electrochemical Society Journal of the Electrochemical Society 161 12 A1765 A1771 https://repository.lib.tottori-u.ac.jp/record/7284/files/jes161(12)_A1765.pdf application/pdf 2.0 MB 2016-11-24