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Enhancement of capacity at high charge/discharge rate and cyclic stability of LiFePO4/C by nickel doping

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Abstract

By introducing nickel chemical into the precursor sol of LiFePO4, a series of Ni-doped LiFePO4 composite cathode materials, denoted as LiFe1 − x Ni x PO4/C (x = 0, 0.01, 0.03, 0.05 and 0.10) were prepared by a spray drying–carbothermal approach. The materials were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), and electrochemical impedance spectrum etc. It is found that the doping of nickel with appropriate amount caused a slight shift of diffraction peaks towards higher angles and enhanced the dispersion of nanoprimary particles, which could be observed from their XRD patterns and SEM images. For the sample with 3 mol% Ni doing, the charge transfer resistance reduced from 52.4 Ω of LiFePO4 to 18.7 Ω of LiFe0.97Ni0.3PO4/C, and the potential interval of the redox peaks reduced from 0.51 to 0.40 V, indicating the better reversible of Ni-doped materials. For the sample LiFe0.97Ni0.03PO4/C, its initial discharge capacities at various rates are 169.2 (0.2 C), 156.2 (1.0 C), 147.9 (2.0 C), 135.5 (5.0 C), and 94.0 (10.0 C) mAh g−1, respectively, enhanced by 55.2 % (at 5.0 C) and 82.1 % (at 10.0 C) compared with LiFePO4. Furthermore, after 200 cycles of charge/discharge at 0.5 C, the capacity of LiFe0.97Ni0.03PO4/C only decreased 8.8 %, but over 25 % decrease was observed for LiFePO4/C.

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Acknowledgment

This work was financially supported by National Nature Science Foundation of China (NFSC) (Project Nos. 21076089, 21003052). We thank Dr. Hao Li for the SEM observations, as well as Guangzhou Great Power Co., Ltd. and Guangzhou Tinci Material Technology Co., Ltd. for their help.

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Authors and Affiliations

  1. Key Laboratory for Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China

    Quanbing Liu, Zushan Liu, Guan Xiao & Shijun Liao

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  1. Quanbing Liu
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  2. Zushan Liu
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  3. Guan Xiao
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  4. Shijun Liao
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Corresponding author

Correspondence to Shijun Liao.

Supporting information available

The charge/discharge curves of LiFe0.97Ni0.03PO4/C and LiFePO4/C composites at different cycle numbers are available free of charge via the Internet at http://support.Springer.com.

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Liu, Q., Liu, Z., Xiao, G. et al. Enhancement of capacity at high charge/discharge rate and cyclic stability of LiFePO4/C by nickel doping. Ionics 19, 445–450 (2013). https://doi.org/10.1007/s11581-012-0775-z

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  • DOI: https://doi.org/10.1007/s11581-012-0775-z

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