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Preparation and characterization of nanoscale LiFePO4 cathode materials by a two-step solid-state reaction method

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Abstract

In order to obtain high-performance nanoscale LiFePO4 cathode materials for lithium-ion batteries, CH3COOLi·2H2O, FeC2O4·2H2O, and NH4H2PO4 were used as raw materials to prepare the precursors of LiFePO4 by room-temperature solid-state reaction method firstly; then, LiFePO4 cathode materials were synthesized by high heating solid-state reaction method. The influence of temperature on the crystal structure, microstructure, and electrochemical properties were studied by thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and charge–discharge performance test. It was indicated that the olivine-phase LiFePO4 not only presented nano-sized particles in the range of 40–80 nm, but also showed excellent initial discharge specific capacity of about 155 mAh/g at 0.2 C at a sintering temperature of 700 °C and possessed good cycle performance. This preparation method without any solvent and carbon source addition could realize industrialized production of single-phase nano-LiFePO4.

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Acknowledgements

This work was supported by the Urumqi Science and Technology Plan (No. P151010005), the National Natural Science Foundation of China (No. 61504168), The Thousand Youth Talents Plan (No. Y42H831301), The Foundation of Director of Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, China (No. 2015RC010), Hebei outstanding young scholars, Science and Technology Program of Hebei Province (D2016403064 and 16044601Z), and Hebei Science and Technology Support Program (15211121).

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Authors and Affiliations

  1. School of Physics Science and Technology, Xinjiang University, Ürümqi, 830046, People’s Republic of China

    Wen-hua Cheng, Qi-bing Zhang & Zhao-jun Wang

  2. Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Ürümqi, 830011, People’s Republic of China

    Wen-hua Cheng, Lei Wang, Qi-bing Zhang, Jin-bao Xu, Wei Ren, Liang Bian & Ai-min Chang

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  1. Wen-hua Cheng
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  2. Lei Wang
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Correspondence to Lei Wang or Wei Ren.

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Cheng, Wh., Wang, L., Zhang, Qb. et al. Preparation and characterization of nanoscale LiFePO4 cathode materials by a two-step solid-state reaction method. J Mater Sci 52, 2366–2372 (2017). https://doi.org/10.1007/s10853-016-0531-2

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  • DOI: https://doi.org/10.1007/s10853-016-0531-2

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