Abstract
As the key to optimizing potassium ion batteries’ (PIBs) performance, the development of high capacity potassium anode is the footstone. Here, through a one-step solvothermal method, uniformly dispersed SbVO4 nanoparticles on the reduced graphene oxide nanosheets (SbVO4@RGO) were synthesized and used as PIBs anodes. SbVO4@RGO anode shows high capacity due to alloying and conversion reactions occur simultaneously in the cyclic process. The anode delivers a capacity as high as 447.9 mAh g−1 at 100 mA g−1. Besides, a cycling life of 500 cycles with small average capacity decay rate (only 0.106% per cycle) is also revealed. It was found in the initial discharge process, SbVO4 transforms into Sb and K3VO4. And in the following cycle Sb and K3VO4 simultaneously react with K+via the alloying/de-alloying and conversion reaction, respectively. The present study of SbVO4@RGO may provide insight for high performance alloying-based/conversion-based potassium anodes.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51922038, 51672078), Hunan Outstanding Youth Talents (2019JJ20005), Hunan Provincial Natural Science Foundation of China (2019JJ40031) and Fundamental Research Funds for the Central Universities.
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Yi, X., Ge, J., Zhou, J. et al. SbVO4 based high capacity potassium anode: a combination of conversion and alloying reactions. Sci. China Chem. 64, 238–244 (2021). https://doi.org/10.1007/s11426-020-9858-3
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DOI: https://doi.org/10.1007/s11426-020-9858-3