期刊
NANO LETTERS
卷 22, 期 24, 页码 10184-10191出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c04293
关键词
NiS2; hollow structure; redox chemistry; cathodes; magnesium-ion batteries
类别
资金
- Agency for Science, Technology and Research (Central Research Fund Award)
The study presents nickel sulfide hollow nanospheres as cathode materials for magnesium-ion batteries, prepared by a one-step solvothermal process. Regulating the synergistic effect between rich anions and hollow structure positively influences the electrochemical performance. The optimized cathode can support the practical application of nickel sulfide hollow nanospheres in magnesium-ion batteries.
Two-dimensional metal dichalcogenides have demonstrated outstanding potential as cathodes for magnesium-ion batteries. However, the limited capacity, poor cycling stability, and severe electrode pulverization, resulting from lack of void space for expansion, impede their further development. In this work, we report for the first time, nickel sulfide (NiS2) hollow nanospheres assembled with nanoparticles for use as cathode materials in magnesium-ion batteries. Notably, the nanospheres were prepared by a one-step solvothermal process in the absence of an additive. The results show that regulating the synergistic effect between the rich anions and hollow structure positively affects its electrochemical performance. Crystallographic and microstructural characterizations reveal the reversible anionic redox of S-2/(S-2)(2-), consistent with density functional theory results. Consequently, the optimized cathode (8-NiS2 hollow nanospheres) could deliver a large capacity of 301 mA h g(-1) after 100 cycles at 50 mA g(-1), supporting the promising practical application of NiS2 hollow nanospheres in magnesium-ion batteries.
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