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Effect of sintering temperature on the morphology and electrochemical properties of LiMn0.5Fe0.5PO4/C synthesized via solid state method

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Abstract

LiMn0.5Fe0.5PO4 cathode materials were prepared via a low-cost solid-state method and mixed with sucrose and then calcined at different temperatures. The structure, morphology, and electrochemical performance of the synthesized material were analyzed via X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, high-resolution transmission electron microscopy, galvanostatic charge–discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy. The results showed that materials prepared via the solid-state method contained nanosized particles with a good olivine structure and exhibited excellent particle dispersibility at various sintering temperatures, resulting in high electrochemical performance. Moreover, at a high sintering temperature of 650 ℃, the battery material exhibited the highest conductivity and lithium-ion diffusion coefficient of 150.9 Ω and 2.15 × 10−5 S cm−1, respectively. The material featured a high discharge specific capacity of 110.0 mAh g−1 at a current density of 5 C owing to its good dispersion and regular spherical particle morphology obtained at 650 ℃. The electrochemical properties of battery materials were directly affected by the improvement and optimization of the parameters in the preparation process.

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Acknowledgements

The authors thank the Hebei Normal University for Nationalities, Chengde, Hebei Province, China, Kunming University of Science and Technology, Kunming, Yunnan Province, China.

Funding

This work is financially supported by Science and Technology Project of Hebei Education Department (grant no. QN2022203), Natural Science Foundation of China (grant no. 52064031), Self Financing Project of Chengde Science and Technology Plan (grant no. 202201A062).

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Authors and Affiliations

  1. Hebei Normal University for Nationalities, Chengde, 067000, Hebei Province, China

    Li Wang, Yanwen Sun & Zhaokun Xuan

  2. National Engineering Research Center for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, Yunnan Province, China

    Yin Li & Yaochun Yao

Authors
  1. Li Wang
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  2. Yanwen Sun
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  3. Yin Li
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  4. Zhaokun Xuan
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Contributions

Li Wang wrote the main manuscript text and prepared Figs. 2–7. Yaochun Yao analyzed Figs. 3–7. Yanwen Sun, Yin Li, and Zhaokun Xuan modified the manuscript. All authors reviewed the manuscript.

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Correspondence to Zhaokun Xuan or Yaochun Yao.

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Wang, L., Sun, Y., Li, Y. et al. Effect of sintering temperature on the morphology and electrochemical properties of LiMn0.5Fe0.5PO4/C synthesized via solid state method. Ionics 29, 4519–4526 (2023). https://doi.org/10.1007/s11581-023-05176-8

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