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Synthesis of high-performance Fe–Mg-co-doped LiMnPO4/C via a mechano-chemical liquid-phase activation technique

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Abstract

Carbon-coated Fe–Mg-homogeneously dispersed Li(Mn0.9Fe0.10)1 − x Mg x PO4/C (x = 0.00, 0.01, 0.03, 0.05, and 0.07) powders are synthesized via a mechano-chemical liquid-phase activation technique. Fine-sized and Fe2+ and Mg2+ evenly distributed precursors are formed using this efficient approach successfully. The synthesis temperature and the Mg2+ doping ratio are investigated and optimized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and electrochemical measurements. Mg doping decreases the lattice parameters of LiMn0.9Fe0.1PO4/C, which will ease the expansion/shrinking effect during the insertion/de-insertion processes. Li(Mn0.9Fe0.1)0.95Mg0.05PO4/C synthesised at 700 °C with ~3 wt% of carbon additive presents the best comprehensive electrochemical properties, and it displays good rate capability with specific discharge capacity of 153 mAh g−1 at 0.1C, 140 mAh g−1 at 1C, and 132 mAh g−1 at 2C rate. The results suggest that the electrochemical performance of the LiMnPO4-based cathode is improved as (Mn0.9Fe0.1) is partially substituted by Mg.

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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 (2012M521546).

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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 Fe–Mg-co-doped LiMnPO4/C via a mechano-chemical liquid-phase activation technique. Ionics 22, 609–619 (2016). https://doi.org/10.1007/s11581-015-1582-0

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  • DOI: https://doi.org/10.1007/s11581-015-1582-0

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