Journal
NANOSCALE
Volume 12, Issue 1, Pages 248-255Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr07849e
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Funding
- National Natural Science Foundation of China [21371023]
- National Key Basic Research Program of China [2015CB251100]
- Beijing Institute of Technology Research Fund Program for Young Scholars [3090012221914]
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Layered SnS2 is considered as a promising anode candidate for sodium-ion batteries yet suffers from low initial coulombic efficiency, limited specific capacity and rate capability. Herein, we report a cobalt metal cation doping strategy to enhance the electrochemical performance of a SnS2 nanosheet array anode through a facile hydrothermal method. Benefitting from this special structure and heteroatom-doping effect, this anode material displays a high initial coulombic efficiency of 57.4%, a superior discharge specific capacity as high as 1288 mA h g(-1) at 0.2 A g(-1) after 100 cycles and outstanding long-term cycling stability with a reversible capacity of 800.4 mA h g(-1) even at 2 A g(-1). These excellent performances could be ascribed to the Co-doping effect that can increase the interlayer spacing, produce rich defects, regulate the electronic environment and improve conductivity. Besides, a carbon cloth substrate can maintain the integrity of the electrode material framework and buffer its volume variation, thus boosting intrinsic dynamic properties and enhancing sodium storage performance.
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