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Amorphous MnO2-modified Li3V2(PO4)3/C as high-performance cathode for LIBs: the double effects of surface coating

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Abstract

MnO2-modified Li3V2(PO4)3/C (LVP/C) composites with plate-like structure were prepared via an improved sol–gel method followed by PVA-assisted suspension coating. The plate-like structure provides an enlarged contact area between the electrolyte and electrode, alleviating the Li+ diffusion and e− transport during the reaction process. The formed hybrid coating layer consisted of C and MnO2 has the double effects, that is, the formation of a complete continuous protective layer on the surface of LVP particles and the simultaneous improvement of electronic and ionic conductivities. This coating layer not only prevents the V3+ dissolution into the electrolyte, but also achieves the simultaneous Li+/e− diffusion at charge–discharge process. Benefiting from the unique structure and the synergistic effect of C and MnO2, the 3 wt% MnO2-modified LVP/C material (M-3) exhibits the most excellent electrochemical performance among all the samples. At a high current rate of 5 C, the M-3 electrode delivers a discharge capacity of 113.2 mAh g−1 and corresponds to capacity retention almost 100% after 100 cycles. Even at low temperatures of 0 and − 20 °C, the discharge capacities of M-3 are 102.4 mAh g−1 at 2 C and 81.6 mAh g−1 at 1 C, with capacity retention of 98.8 and 97.3%, respectively. The enhanced electrochemical performance of M-3 is mainly attributed to the cooperation of C and MnO2, which provides large specific surface area and complete conductive network. As a result, the MnO2-modified LVP/C composites with the plate-like structure can be a promising candidate as cathode materials for LIBs.

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Acknowledgements

This work is supported by the Natural Science Foundation of China under Grant No. 51372165 and Guizhou Province-University Scientific and Technological Cooperation Program under Grant No. [2014] 7003.

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Authors and Affiliations

  1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China

    Baoyu Wang, Dandan Sun, Ruisong Guo, Zhichao Liu, Leichao Meng, Mei Zheng, Fuyun Li, Tingting Li & Yani Luo

  2. Guizhou Radio and Television University, Guiyang, 550004, China

    Hong Jiang

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  1. Baoyu Wang
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Wang, B., Sun, D., Guo, R. et al. Amorphous MnO2-modified Li3V2(PO4)3/C as high-performance cathode for LIBs: the double effects of surface coating. J Mater Sci 53, 2709–2724 (2018). https://doi.org/10.1007/s10853-017-1690-5

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