期刊
NANO ENERGY
卷 40, 期 -, 页码 655-662出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.09.018
关键词
Vanadium nitride; Chemical anchoring; Physical trapping; Polysulfides; Sulfur cathodes; Lithium-sulfur battery
类别
资金
- National Natural Science Foundation of China [51572100, 51504171, 61434001]
- Outstanding Young and Middle-aged Scientific Innovation Team of Colleges and Universities of Hubei Province [T201402]
- Natural Science Foundation of Hubei Province [2015CFA116]
- Project of Hubei Provincial Education Office [B2015346]
- HUST Key Interdisciplinary Team Project [2016JCTD101]
- City University of Hong Kong Applied Research Grant [9667104]
Lithium-sulfur (Li-S) battery is one of the most promising energy storage systems due to its large energy density of 2560 Wh kg(-1). However, severe shuttle effect of polysulfide intermediates, poor conductivity of S and large volume change during cycling cause fast capacity fading and poor cycle performance. Herein, we demonstrate S nanodots impregnated microporous carbon encapsulated conductive mesoporous vanadium nitride nanowires (S/MVN@C NWs) as high-performance S cathode materials for Li-S batteries. The S nanodots with the size of 2-5 nm are impregnated into the mesopores of MVN@C NWs and further encapsulated with microporous carbon. During cycling, the polysulfides intermediates are strongly chemical anchored by the conductive MVN NWs and further physically trapped by microporous carbon coating within the cathode. The freestanding and binder-free cathode comprising intertwining and interpenetrating S/MVN@C NWs demonstrates highly mechanical flexibility, which deliver a long cycle life of 636 mAh g(-1) after 200 cycles at 1 C (1650 mA g(-1)) and high rate performance with a capacity of 543 mAh g(-1) at 10 C. Even at a high areal mass loading of 9.7 mg cm(-2), a large and stable capacity of 7.1 mAh cm(-2) is achieved. The strategy combining microporous carbon coating with high conducting mesoporous metal nitrides opens a feasible route to design large-capacity and high-stability S-based cathodes for Li-S batteries.
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