期刊
ELECTROCHEMISTRY
卷 88, 期 6, 页码 548-554出版社
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.20-00091
关键词
Lithium-ion Battery; Negative Electrode; Composite; Ionic-liquid Electrolyte
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [19K05649, 19H02817, JP20H00399, JP18K04965]
- NIMS Joint Research Hub Program
We investigated the applicability of ionic-liquid electrolytes to FeSi2/Si composite electrode for lithium-ion batteries. In conventional organic-liquid electrolytes, a discharge capacity of the electrode rapidly faded. In contrast, the electrode exhibited a superior cycle life with a reversible capacity of 1000 mA hg(Si)(-1) over 850 cycles in a certain ionic-liquid electrolyte. The difference in the cycle life was explained by surface film properties. In addition, the rate performance of the FeSi2/Si electrode improved in another ionic-liquid electrolyte. Remarkably, lithiation of only Si in FeSi 2 /Si composite electrode occurred whereas each FeSi2- and Si-alone electrode alloyed with Li in the ionic-liquid electrolyte. FeSi2 certainly covered the shortcomings of Si and the FeSi2/Si composite electrode exhibited improved cycle life and rate capability compared to Sialone electrode. (C) The Author(s) 2020. Published by ECSJ.
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