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Electrochemical performance of LiFePO4/(C+Fe2P) composite cathode material synthesized by sol-gel method

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Abstract

A LiFePO4/(C+Fe2P) composite cathode material was prepared by a sol-gel method using Fe(NO3)3·9H2O, LiAc·H2O, NH4H2PO4 and citric acid as raw materials, and the physical properties and electrochemical performance of the composite cathode material were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical tests. The Fe2P content, morphology and electrochemical performance of LiFePO4/(C+Fe2P) composite depend on the calcination temperature. The optimized LiFePO4/(C+Fe2P) composite is prepared at 650 °C and the optimized composite exhibits sphere-like morphology with porous structure and Fe2P content of about 3.2% (mass fraction). The discharge capacity of the optimized LiFePO4/(C+Fe2P) at 0.1C is 156 and 161 mA·h/g at 25 and 55 °C, respectively, and the corresponding capacity retentions are 96% after 30 cycles; while the capacity at 1C is 142 and 149 mA·h/g at 25 and 55 °C, respectively, and the capacity still remains 135 and 142 mA·h/g after 30 cycles at 25 and 55 °C, respectively.

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Authors and Affiliations

  1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan, 411105, China

    Quan-qi Chen  (陈权启) & Xiao-shuan Li  (李小栓)

  2. Department of Chemistry, Zhejiang University, Hangzhou, 310027, China

    Quan-qi Chen  (陈权启) & Jian-ming Wang  (王建明)

Authors
  1. Quan-qi Chen  (陈权启)
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  2. Xiao-shuan Li  (李小栓)
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  3. Jian-ming Wang  (王建明)
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Correspondence to Quan-qi Chen  (陈权启).

Additional information

Foundation item: Project(50571091) supported by the National Natural Science Foundation of China; Project(09C947) supported by the Scientific Research Fund of Hunan Provincial Education Department, China

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Chen, Qq., Li, Xs. & Wang, Jm. Electrochemical performance of LiFePO4/(C+Fe2P) composite cathode material synthesized by sol-gel method. J. Cent. South Univ. Technol. 18, 978–984 (2011). https://doi.org/10.1007/s11771-011-0790-7

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  • DOI: https://doi.org/10.1007/s11771-011-0790-7

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