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Synthesis of high-performance LiMnPO4/C /rGO composite via a mechanical-activation-assisted polyol process

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Abstract

A mechanical-activation-assisted polyol method for efficient preparation of high-performance rod-like LiMnPO4 composite is developed. The nanosized [Mn3(PO4)2·8H2O + Li3PO4]/graphene oxide (GO) precursors are prepared via a mechano-chemical liquid-phase activation–assisted technique from LiH2PO4 and manganese powder. LiMnPO4/reduced graphene oxide (rGO) samples are obtained by polyol process in boiling triethylene glycol (TEG) and then followed with pyrolytic carbon coating to prepare the LiMnPO4/C/rGo nanocomposite. The characterized results prove that well-crystallized LiMnPO4 nanorods can be successfully synthesized by polyol processing. The LiMnPO4 nanorods have a large percentage of highly oriented (020) facets, which provide a high pore density for Li-ion insertion/extraction. Both rGO modification and further carbon coating significantly improve the conductivity and reduce the charge-transfer resistance. The optimized LiMnPO4/C/rGO composite delivers good electrochemical performance.

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Acknowledgments

This work was supported by the Nature Science Foundation of Hunan province (Grant No.2015JJ3152), Fundamental Research Funds for the Central Universities (2012QNZT018), and China Postdoctoral Science Foundation (2012 M521546).

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China

    Jianguo Duan, Guorong Hu, Yanbing Cao, Ke Du & Zhongdong Peng

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  1. Jianguo Duan
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  2. Guorong Hu
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  3. Yanbing Cao
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  4. Ke Du
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  5. Zhongdong Peng
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Correspondence to Yanbing Cao.

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Duan, J., Hu, G., Cao, Y. et al. Synthesis of high-performance LiMnPO4/C /rGO composite via a mechanical-activation-assisted polyol process. Ionics 22, 1541–1549 (2016). https://doi.org/10.1007/s11581-016-1682-5

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  • DOI: https://doi.org/10.1007/s11581-016-1682-5

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