期刊
CHEMSUSCHEM
卷 10, 期 23, 页码 4778-4785出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701334
关键词
anode; batteries; chalcogenides; electrolytes; sodium
资金
- 973 Program [2015CB251103]
- National Natural Science Foundation of China [51472104, 21473075]
- Jilin Provincial Science and Technology Department [2015020478GX]
Co9S8 has been regarded as a desirable anode material for sodium-ion batteries because of its high theoretical capacity. In this study, a Co9S8 anode material containing 5.5wt% Co (Co9S8/Co) was prepared by a solid-state reaction. The electrochemical properties of the material were studied in carbonate and ether-based electrolytes (EBE). The results showed that the material had a longer cycle life and better rate capability in EBE. This excellent electrochemical performance was attributed to a low apparent activation energy and a low overpotential for Na deposition in EBE, which improved the electrode kinetic properties. Furthermore, EBE suppressed side reactions of the electrode and electrolyte, which avoided the formation of a solid electrolyte interphase film.
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