Electrochemical and interfacial behavior of a FeSi2.7 thin film electrode in an ionic liquid electrolyte
- Authors
- Choi, Ji-Ae; Kim, Dong-Won; Bae, Young-San; Song, Seung-Wan; Hong, Soo-Hyung; Lee, Sung-Man
- Issue Date
- Nov-2011
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Ionic liquid; Si-based anode; Si-Fe alloy; Lithium-ion battery; SEI layer
- Citation
- ELECTROCHIMICA ACTA, v.56, no.27, pp.9818 - 9823
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 56
- Number
- 27
- Start Page
- 9818
- End Page
- 9823
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/167268
- DOI
- 10.1016/j.electacta.2011.08.080
- ISSN
- 0013-4686
- Abstract
- A FeSi2.7 thin film is deposited on a copper substrate by RF magnetron sputtering of a Fe-Si alloy target. The electrochemical behavior of the FeSi2.7 electrode in ionic liquid electrolyte based on 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide is investigated and compared with that of a FeSi2.7 electrode in conventional liquid electrolyte. The FeSi2.7 electrode in the ionic liquid electrolyte delivers an initial discharge capacity of 756 mAh g(-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 FeSi2.7 electrode in the ionic liquid electrolyte leads to a good capacity retention. This study demonstrates that the FeSi2.7 electrode exhibits stable cycling behavior and good interfacial characteristics in the ionic liquid electrolyte without any solvents and additives.
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