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An investigation into LiFePO4/C electrode by medium scan rate cyclic voltammetry

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Abstract

A LiFePO4/C sample was prepared via solid state reaction and characterized with X-ray powder diffraction, scanning electron microscopy and charge–discharge test. Conductive carbon and highly crystallized LiFePO4 were embedded in each other to form the as-prepared LiFePO4/C, which exhibited an excellent rate capability and capacity retention. The LiFePO4/C electrode reaction was investigated by the method of medium scan rate cyclic voltammetry (CV) under temperature variation. The limit values for the CV redox peak potentials of the LiFePO4/C electrode scanned at different rates were obtained by curve fitting. The reversibility of the LiFePO4/C electrode was studied and found to be both scan rate and temperature dependent. A higher temperature led to a higher critical CV scan rate for a reversible LiFePO4/C electrode. In the electrode process, a higher temperature resulted in a smoother Fe3+/Fe2+ redox reaction, better reversibility, lower R cv, smaller charge transfer resistance and higher Li+ ion diffusion coefficient at the cathode of the LiFePO4/C.

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Acknowledgments

The work is partially supported by Natural Science Foundation of Yunnan Province (2010ZC051), PR China, and Analysis and Testing Foundation (20140439) and Starting Research Fund (14118245) from Kunming University of Science and Technology, PR China.

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Authors and Affiliations

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    Zhengwei Xiao & Yingjie Zhang

  2. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China

    Guorong Hu

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  1. Zhengwei Xiao
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  2. Yingjie Zhang
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  3. Guorong Hu
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Correspondence to Yingjie Zhang or Guorong Hu.

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Xiao, Z., Zhang, Y. & Hu, G. An investigation into LiFePO4/C electrode by medium scan rate cyclic voltammetry. J Appl Electrochem 45, 225–233 (2015). https://doi.org/10.1007/s10800-014-0780-1

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  • DOI: https://doi.org/10.1007/s10800-014-0780-1

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