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Study on discharge voltage and discharge capacity of LiFe1−xMnxPO4 with high Mn content

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Abstract

Rod-like LiFe1−xMnxPO4/C cathode with particle size of about 300–500 nm was fabricated successfully via simple hydrothermal method. By means of adjusting the manganese content of LiFe1−xMnxPO4, the electrochemical property was studied to clarify the effect of manganese content. LiFe1−xMnxPO4/C sample with x = 0.70 showed the superior specific discharge capacity of 153.1 mAh g−1 at a rate of 0.1 C, and the electrochemical mechanism analyzed by electrochemical impedance spectra demonstrated that the LiFe0.30Mn0.70PO4/C exhibited the smallest charge transfer impedance and the largest lithium-ion diffusion coefficient. With the increase of manganese content, the reduction of discharge capacity is attributed to the linear decrease of Mn2+/Mn3+ reduction reaction. When x = 0.80, the two discharge platforms located at 3.5 and 3.9 V, respectively, reach a maximum, which result from the reduction electromotive force of Fe2+/Fe3+ affected by the addition of manganese ions since the discharge platform of LiMnPO4 is higher than that of LiFePO4.

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Acknowledgements

The authors would like to thank the financial supports from Shandong Natural Science Foundation Project (Grant No. ZR2015EM013).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, People’s Republic of China

    Shang-min Gong, Xue Bai, Rui Liu, Hong-quan Liu & Yi-jie Gu

  2. School of Mechanical-Electronic and Vehicle Engineering, Weifang University, Weifang, 261061, People’s Republic of China

    Yi-jie Gu

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  1. Shang-min Gong
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Gong, Sm., Bai, X., Liu, R. et al. Study on discharge voltage and discharge capacity of LiFe1−xMnxPO4 with high Mn content. J Mater Sci: Mater Electron 31, 7742–7752 (2020). https://doi.org/10.1007/s10854-020-03311-z

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  • DOI: https://doi.org/10.1007/s10854-020-03311-z

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