期刊
NANO RESEARCH
卷 10, 期 9, 页码 3202-3211出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1537-z
关键词
FeSe2 clusters; superior rate capability; excellent cycling stability; sodium-ion batteries; pseudocapacitive behavior
类别
资金
- National Key Research and Development Program of China [2016YFA0202603]
- National Natural Science Foundation of China [51425204, 51602239]
- Hubei Provincial Natural Science Foundation of China [2016CFB267]
- Fundamental Research Funds for the Central Universities [2016IVA090, 2017III005]
- Natural Science Foundation of Henan Province [152300410114, 14B140009]
- China Postdoctoral Science Foundation [2016M592401]
- China Scholarship Council [201606955096]
Sodium-ion batteries (SIBs) have great promise for sustainable and economical energy-storage applications. Nevertheless, it is a major challenge to develop anode materials with high capacity, high rate capability, and excellent cycling stability for them. In this study, FeSe2 clusters consisting of nanorods were synthesized by a facile hydrothermal method, and their sodium-storage properties were investigated with different electrolytes. The FeSe2 clusters delivered high electrochemical performance with an ether-based electrolyte in a voltage range of 0.5-2.9 V. A high discharge capacity of 515 mAh.g(-1) was obtained after 400 cycles at 1 A.g(-1), with a high initial columbic efficiency of 97.4%. Even at an ultrahigh rate of 35 A.g(-1), a specific capacity of 128 mAh.g(-1) was achieved. Using calculations, we revealed that the pseudocapacitance significantly contributed to the sodium-ion storage, especially at high current rates, leading to a high rate capability. The high comprehensive performance of the FeSe2 clusters makes them a promising anode material for SIBs.
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