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Electrochemical and interfacial behavior of a FeSi2.7 thin film electrode in an ionic liquid electrolyte |
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| Authors: | Ji-Ae Choi Dong-Won Kim Young-San Bae Seung-Wan Song Soo-Hyung Hong Sung-Man Lee |
| Affiliation: | aDepartment of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of Korea;bDepartment of Fine Chemical Engineering & Applied Chemistry, Chungnam National University, Daejeon 305-764, Republic of Korea;cDepartment of Advanced Materials Science and Engineering, Kangwon National University, Kangwon-Do 200-701, Republic of Korea |
| 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. |
| Keywords: | Ionic liquid Si-based anode Si&ndash Fe alloy Lithium-ion battery SEI layer |
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