Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (07): 840-844.doi: 10.1016/S1872-1508(06)60037-5

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One-step Solid-state Synthesis and Electrochemical Performance of Nb-doped LiFePO4/C

ZHUANG Da-Gao;ZHAO Xin-Bing;XIE Jian;TU Jian;ZHU Tie-Jun;CAO Gao-Shao   

  1. State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2006-02-21 Revised:2006-03-24 Published:2006-06-27
  • Contact: ZHAO Xin-Bing E-mail:zhaoxb@zju.edu.cn

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Abstract: Nb-doped LiFePO4/C was synthesized using one-step solid-state method. The effect of Nb contents on the electrochemical performance was investigated. The results showed that the electrochemical performances were remarkably promoted. The discharge capacities of Li0.96Nb0.008FePO4/C cathode material were 161, 148, and 132 mAh•g−1 at the charge and discharge rates of 0.5C, 1C, and 2C, respectively. The results of cyclic voltammetry and EIS analyses showed that the resistance and polarization of the LiFePO4/C composite electrode could be effectively decreased by Nb doping, which would improve the electron conductivity of LiFePO4.

Key words: Lithium ion battery, Cathode material, Nb doping, LiFePO4/C, Electrochemical performance