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Electrochemical Intercalation of Cesium into Graphite in Ionic Liquid Electrolyte (Supporting Information)

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posted on 2024-02-20, 06:30 authored by Alisha YADAV, Hironobu KOBAYASHI, Takayuki YAMAMOTO, Toshiyuki NOHIRA
Graphite is widely used as the negative electrode for alkali-metal ion secondary batteries because of its ability to accommodate various ions between its graphene layers resulting in the formation of graphite intercalation compounds (GICs). In this study, we investigated the intercalation of Cs+ ions into graphite using an ionic liquid (IL)-based electrolyte, Cs[FTA]–[C4C1pyrr][FTA] (FTA = (fluorosulfonyl)(trifluoromethylsulfonyl)amide, C4C1pyrr = N-butyl-N-methylpyrrolidinium). In this electrolyte, the graphite negative electrode imparted an initial reversible capacity of 180 mAh g−1 at 298 K. The formation of Cs-GICs was analyzed using an X-ray diffraction technique to reveal the formation of stage-1 CsC8. The formation potentials of various alkali metal GICs were also compared with respect to the potential of ferrocenium/ferrocene redox couple, revealing that these GICs particularly for stage-1 compounds form in a similar potential range with small differences of 0.2–0.3 V.

Funding

Development of novel ionic liquid electrolytes with potassium ion as a charge carrier

Japan Society for the Promotion of Science

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Construction of dual-carbon batteries based on their reaction potentials

Japan Society for the Promotion of Science

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Research Foundation for the Electrotechnology of Chubu

Kyoto University Foundation

Murata Science and Education Foundation

History

Corresponding author email address

yamamoto.takayuki.2w@kyoto-u.ac.jp

Copyright

© 2024 The Author(s).

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