Enhanced electrochemical performance of Na3V2(PO4)2F3 for Na-ion batteries with nanostructure and carbon coating
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Carbon-coating Na3V2(PO4)2F3 nanoparticles (NVPF@C NP) were prepared by a hydrothermal assisted sol–gel method and applied as cathode materials for Na-ion batteries. The as-prepared nanocomposites were composed of Na3V2(PO4)2F3 nanoparticles with a typical size of ~ 100 nm and an amorphous carbon layer with the thickness of ~ 5 nm. Cyclic voltammetry, rate and cycling, and electrochemical impedance spectroscopy tests were used to discuss the effect of carbon coating and nanostructure. Results display that the as-prepared NVPF@C NP demonstrates a higher rate capability and better long cycling performance compared with bare Na3V2(PO4)2F3 bulk (72 mA h g−1 at 10 C vs 39 mA h g−1 at 10 and 1 C capacity retention of 95% vs 88% after 50 cycles). The remarking electrode performance was attributed to the combination of nanostructure and carbon coating, which can provide short Na-ion diffusion distance and rapid electron migration.
This work was supported by grants from the National Natural Science Foundation of China (Grant No. 21503170) and Fundamental Research Funds for the Central Universities (XDJK2017D022, XDJK2018C006).
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Conflict of interest
The authors declare that they have no conflict of interest.
- 20.C. Ding, X. Huang, H. Zhang, W. Zhong, Y. Xia, C. Dai, Y. Qin, J. Zhu, J. Mater. Sci.: Mater. Electron. 29, 6491 (2018)Google Scholar