Electrochemical and interfacial behavior of a FeSi sub(2.7) thin film electrode in an ionic liquid electrolyte

A FeSi sub(2.7) thin film is deposited on a copper substrate by RF magnetron sputtering of a Fe-Si alloy target. The electrochemical behavior of the FeSi sub(2.7) electrode in ionic liquid electrolyte based on 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide is investigated and comp...

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Bibliographic Details
Published in:Electrochimica acta 2011-11, Vol.56 (27), p.9818-9823
Main Authors: Choi, Ji-Ae, Kim, Dong-Won, Bae, Young-San, Song, Seung-Wan, Hong, Soo-Hyung, Lee, Sung-Man
Format: Article
Language:English
Subjects:
Discharge
Electrodes
Electrolytes
Ferrous alloys
Intermetallic compounds
Ionic liquids
Magnetron sputtering
Solvents
Thin films
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Summary:A FeSi sub(2.7) thin film is deposited on a copper substrate by RF magnetron sputtering of a Fe-Si alloy target. The electrochemical behavior of the FeSi sub(2.7) electrode in ionic liquid electrolyte based on 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide is investigated and compared with that of a FeSi sub(2.7) electrode in conventional liquid electrolyte. The FeSi sub(2.7) electrode in the ionic liquid electrolyte delivers an initial discharge capacity of 756 mAh g super(-1) at room temperature, and its discharge capacity is maintained to be 92% of the initial discharge capacity after the 100th cycle. AC impedance and FTIR analysis reveal that the formation of a stable solid electrolyte interphase (SEI) layer on the FeSi sub(2.7) electrode in the ionic liquid electrolyte leads to a good capacity retention. This study demonstrates that the FeSi sub(2.7) electrode exhibits stable cycling behavior and good interfacial characteristics in the ionic liquid electrolyte without any solvents and additives.
ISSN:0013-4686
DOI:10.1016/j.electacta.2011.08.080