Journal
ENERGY STORAGE MATERIALS
Volume 20, Issue -, Pages 46-54Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2018.11.004
Keywords
Antimony nanocrystals; Carbon nanosheets; Composite anode; K-ion battery
Funding
- National Postdoctoral Program for Innovative Talents [BX201600140]
- China Postdoctoral Science Foundation [2016M600484]
- Fundamental Research Funds for the Central Universities [WK2060190078]
- Anhui Provincial Natural Science Foundation [1808085QB25]
- National Natural Science Foundation of China [21701163, 21671181, 21831006]
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Sb based anode materials have been attracted enormous attention for K-ion batteries due to its high capacity and low working potential. However, the main challenge facing Sb anode is the huge volume change (similar to 400%). In this work, antimony nanocrystals embedded ultrathin carbon nanosheets (Sb/CNS) are prepared through a one-step solvothermal metathesis reaction between ferrocene and antimony trichloride in hexane. The antimony nanocrystals with an average size of 14.0 nm are uniformly embedded into the amorphous carbon nanosheets with a layer thickness about 18.6 nm. Without adding hexane, only bulk Sb/C composite is obtained. As anode for PIBs, a high specific capacity of 288.2 mA h g(-1) and an outstanding rate capability (101.4 mA h g(-1) at 2000 mA g(-1)) can be maintained. Even for 600 cycles at 200 mA g(-1), a reversible capacity of 247 mA h g(-1) (up to 90% capacity retention) is obtained. The electrochemical performance is far better than that of the bulk counterpart. It is demonstrated through a series experimental measurements that this unique structure enables the Sb/CNS composite to accommodate the volume change of Sb, promote the fast electronic/ionic diffusion, and suppress the interface reaction with electrolyte during discharge/charge procedure.
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