期刊
CHEMICAL ENGINEERING JOURNAL
卷 387, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124125
关键词
Rechargeable Mg batteries; Mg-intercalation materials; Cu2MoS4; Hollow structures; Solid-state diffusion kinetics
资金
- International Science and Technology Cooperation Programme [2019YFE010186]
- Hubei Provincial Natural Science Foundation [2019CFB452, 2019CFB620]
Rechargeable Mg batteries attract an increasing interest for grid energy storage because of the high safety and low cost; however, lack of Mg-intercalation cathodes is seriously hindering their development. In the present study, hollow polyhedral Cu2MoS4 nanocages (CMS-H) are synthesized and investigated as a novel cathode for rechargeable Mg batteries. The layered structure of I-phase Cu2MoS4 acts as ideal host for reversible Mg2+ intercalation/deintercalation, during which the interlayer spacing changes along with valence state change of Cu and Mo elements. CMS-H provides a high reversible capacity (180 mAh g at 50 mA g(-1)) and an excellent rate performance beyond simple Cu2MoS4 nanosheets, demonstrating the privilege of hollow architecture in Mg-storage via accommodating the strain and constructing short-range electron/ion transport pathways. CMS-H exhibits a superior cycleability over 2500 cycles, indicating the stability of I-phase Cu2MoS4 during long-term Mg-intercalation cycling. The present results highlight a new type of hollow Cu2MoS4 material for fast and stable Mg-storage, which is of great significance and provides scientific insights for the development of high-performance cathodes for rechargeable Mg batteries.
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