期刊
NANO ENERGY
卷 54, 期 -, 页码 360-366出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.10.033
关键词
Bimetallic diselenides; Magnesium batteries; Redox sites; Diffusion dynamics
类别
资金
- National Key Research and Development Program of China [2016YFA0202603]
- National Basic Research Program of China [2013CB934103]
- National Natural Science Foundation of China [51602239]
- Natural Science Foundation of Hubei Province [2016CFB267]
- Fundamental Research Funds for the Central Universities [WUT: 2016III003, 2016IVA090, 2017III005]
Although Mg metal features high volumetric energy density and electrochemical dendrite-free deposition, Mg-storage cathode materials with desirable capacity and long-term stability have reached a bottleneck due to large diffusion barrier of Mg2+. Herein, we report for the first time Ni-Fe bimetallic diselenides microflowers (Ni0.75Fe0.25Se2, NFS) as cathode materials for rechargeable magnesium batteries. The NFS exhibits a considerable reversible capacity of 190 mAh g(-1) and excellent Mg-storage cycling stability (148 mAh g(-1) even after 500 cycles). Compared with unary transitional-metal diselenides (NiSe2, NS), the NFS shows more redox active sites and higher Mg2+ diffusion dynamics, contributing to superior reversible capacity and long cycle life. Furthermore, the concept of sequential reaction based on the potential discrepancy for the NFS magnesiation/demagnesiation process at steady stage was put forward and evidenced by electrochemical measurement and structural characterization. This paper paves the way for constructing advanced high-performance cathode materials of rechargeable magnesium batteries.
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