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Synthesis and characterization of LiMn0.8Fe0.2PO4/rGO/C for lithium-ion batteries via in-situ coating of Mn0.8Fe0.2C2O4·2H2O precursor with graphene oxide

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Abstract

LiMn0.8Fe0.2PO4 is a potential candidate cathode material to balance the energy density, safety, and cost of power lithium ion batteries. However, the low electronic conductivity and ion diffusion coefficient limit its application. Here, bimetallic oxalate Mn0.8Fe0.2C2O4·2H2O/graphene oxide (Mn0.8Fe0.2C2O4·2H2O/GO) is designed to synthesize homogeneously distributed LiMn0.8Fe0.2PO4/reduced graphene oxide/carbon (LiMn0.8Fe0.2PO4/rGO/C) composite. The influence of rGO on the morphologies, structure, and electrochemical performance of the as-synthesized composite is investigated. The composite LiMn0.8Fe0.2PO4/rGO/C delivers discharge capacity of 153.2 mAh g−1 at 0.05 C and 127.3 mAh g−1 at 5 C, and 97.2% capacity retention even after 300 cycles at 1 C. The results confirm that the introduction of rGO sheets can alleviate the agglomeration of LiMn0.8Fe0.2PO4 particles. Furthermore, the conductive network composed of rGO sheets and pyrolytic organic carbon links the particles together to improve the migration pathways of electrons and lithium ions, thus enhancing the electrochemical performance of LiMn0.8Fe0.2PO4/rGO/C.

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Acknowledgements

We gratefully acknowledge the National Natural Science Foundation of China (Grant No. 51874358, 51602352, and 51772333).

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  1. Guorong Hu and Yongzhi Wang contributed equally to this work.

Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Guorong Hu, Yongzhi Wang, Ke Du, Zhongdong Peng, **aoming **e & Yanbing Cao

  2. Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, 410083, China

    Guorong Hu, Yongzhi Wang, Ke Du, Zhongdong Peng, **aoming **e & Yanbing Cao

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  1. Guorong Hu
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Correspondence to Yanbing Cao.

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Hu, G., Wang, Y., Du, K. et al. Synthesis and characterization of LiMn0.8Fe0.2PO4/rGO/C for lithium-ion batteries via in-situ coating of Mn0.8Fe0.2C2O4·2H2O precursor with graphene oxide. J Solid State Electrochem 24, 2441–2450 (2020). https://doi.org/10.1007/s10008-020-04774-0

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