期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 47, 页码 12794-12798出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201407898
关键词
electrochemical exfoliation; expanded layers; MoS2; pseudocapacitance; sodium-ion batteries
资金
- 973 Program [2011CB935900]
- NSFC [21231005, 51231003]
- MOE Project [B12015, IRT13R30]
MoS2 nanoflowers with expanded interlayer spacing of the (002) plane were synthesized and used as high-performance anode in Na-ion batteries. By controlling the cut-off voltage to the range of 0.4-3 V, an intercalation mechanism rather than a conversion reaction is taking place. The MoS2 nanoflower electrode shows high discharge capacities of 350 mAhg(-1) at 0.05 Ag-1, 300 mAhg(-1) at 1 Ag-1, and 195 mAhg(-1) at 10 Ag-1. An initial capacity increase with cycling is caused by peeling off MoS2 layers, which produces more active sites for Na+ storage. The stripping of MoS2 layers occurring in charge/discharge cycling contributes to the enhanced kinetics and low energy barrier for the intercalation of Na+ ions. The electrochemical reaction is mainly controlled by the capacitive process, which facilitates the high-rate capability. Therefore, MoS2 nanoflowers with expanded interlayers hold promise for rechargeable Na-ion batteries.
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