Wafer-like FeSe2-NiSe2/C nanosheets as efficient anode for high-performances lithium batteries

[Display omitted] •The wafer-like FeSe2-NiSe2/C multi-layer nanosheets were first synthesized successfully.•The nanosheets have excellent electrochemical performance with stable lithium storage capacity.•The nanosheets with big area have faster ion diffusion channels and more active sites.•The rever...

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Veröffentlicht in:Chemical physics letters 2020-05, Vol.746, p.137274, Article 137274
Hauptverfasser: Yang, Shuangyi, He, Miao, Deng, Xiaoqian, Feng, Yefeng, Huang, Xiping, Wu, Kaidan, Bai, Chen, Ke, Jin, Xiong, Deping
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Sprache:eng
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Zusammenfassung:[Display omitted] •The wafer-like FeSe2-NiSe2/C multi-layer nanosheets were first synthesized successfully.•The nanosheets have excellent electrochemical performance with stable lithium storage capacity.•The nanosheets with big area have faster ion diffusion channels and more active sites.•The reversible capacity can retain 700.5 mAh g−1 after 100 cycles at 1 A g−1. Owing to the high-energy capacity and safety characteristics, transition metal selenides are considered as the promising anode materials for lithium-ion batteries, which has aroused widespread interest in recent years. Thus FeSe2-NiSe2/C multi-layer sheets (FNMS@C) are prepared after hydrothermal process and ball-milling treatment. The layers with large surface area provide low Li-ion diffusion energy barrier to achieve long-cycle and high energy. The FNMS@C electrode shows an excellent rate performance. Moreover it delivers a high reversible capacity of 700.5 mAh g−1 after 100 cycles at 1 A g−1.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2020.137274