Abstract
The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron phosphate. Herein, using the sol-gel method, a lithium vanadium phosphate with higher average discharge voltage (3.8 V, vs. Li+/Li) was obtained from a single source for Mg2+ and Cl− co-substitution and uniform carbon coating, and a nearly theoretical capacity (130.1 mA h g−1) and outstanding rate performance (25 C) are acquired together with splendid capacity retention (80%) after 650 cycles. This work reveals that the well-sized anion and cation substitution and uniform carbon coating are of both importance to accelerate kinetic performance in the context of nearly undisturbed crystal structure for other analogue materials. It is anticipated that the electrochemistry comprehension will shed light on preparing cathode materials with high energy density in the future.
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Acknowledgements
This work was supported by the Basic Science Center Project of Natural Science Foundation of China (51788104), the National Natural Science Foundation of China (51803054, 51772093), the “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (XDA21070300), the Natural Science Foundation of Hunan Province (2019JJ50223), and “Double First-Class” School Construction Project and Outstanding Youth Fund of Hunan province (SYL201802008, 2019JJ20010).
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Zeng, XX., Chen, H., Guo, G. et al. Raising the capacity of lithium vanadium phosphate via anion and cation co-substitution. Sci. China Chem. 63, 203–207 (2020). https://doi.org/10.1007/s11426-019-9647-8
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DOI: https://doi.org/10.1007/s11426-019-9647-8