Journal
SMALL
Volume 15, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201902797
Keywords
cathodes; CuS1-xSex nanosheets; microwave-assisted synthesis; rate capability; rechargeable magnesium batteries
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Funding
- National Natural Science Foundation of China [21371023]
- Beijing Institute of Technology Research Fund Program for Young Scholars [3090012221914]
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Rechargeable magnesium batteries (rMBs) are promising as the most ideal further energy storage systems but lack competent cathode materials due to sluggish redox reaction kinetics. Herein, developed is an anionic Se-substitution strategy to improve the rate capability and the cycling stability of 2D CuS1-xSex nanosheet cathodes through an efficient microwave-induced heating method. The optimized CuS1-xSex (X = 0.2) nanosheet cathode can exhibit high reversible capacity of 268.5 mAh g(-1) at 20 mA g(-1) and good cycling stability (140.4 mAh g(-1) at 300 mA g(-1) upon 100 cycles). Moreover, the CuS1-xSex (X = 0.2) nanosheet cathode can deliver remarkable rate capability with a reversible capacity of 119.2 mAh g(-1) at 500 mA g(-1), much higher than the 21.7 mAh g(-1) of pristine CuS nanosheets. The superior electrochemical performance can be ascribed to the enhanced reaction kinetics, enriched cation storage active sites, and shortened ion diffusion pathway of the CuS1-xSex nanosheet. Therefore, tuning anionic chemical composition demonstrates an effective strategy to develop novel cathode materials for rMBs.
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