An investigation of the electrochemical performance of polyaniline coated LiFePO4 materials

Authors

  • Gangtie Lei,

    Corresponding author
    1. Key Laboratory of Environmental-friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan 411105, P. R. China
    • Key Laboratory of Environmental-friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan, 411105, P. R. China.
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  • Xiaohua Yi,

    1. Key Laboratory of Environmental-friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan 411105, P. R. China
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  • Lei Wang,

    1. Key Laboratory of Environmental-friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan 411105, P. R. China
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  • Zhaohui Li,

    1. Key Laboratory of Environmental-friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan 411105, P. R. China
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  • Ji Zhou

    1. Key Laboratory of Environmental-friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan 411105, P. R. China
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Abstract

A series of polyaniline-LiFePO4 (PAn-LiFePO4) composites were synthesized by in situ polymerization. The samples were characterized by thermogravimetry (TG) and scanning electron microscope (SEM). Electrochemical impedance measurements showed that the polyaniline significantly decreased the charge-transfer resistance of LiFePO4 electrodes. Charge–discharge properties of composites as cathode materials for lithium-ion batteries were studied. The results indicated that PAn-LiFePO4 composites had higher discharge capacity and better cycling property. The PAn-LiFePO4 composite with 25 wt% polyaniline showed the best electrochemical performance. Its first specific discharge capacity was 140.3 mAh/g at 0.1 C and its specific discharge capacity was 118.7 mAh/g after 50 cycles at 1 C. Copyright © 2009 John Wiley & Sons, Ltd.

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