J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (03): 405-409.

• Research Articles • Previous Articles     Next Articles

Doping Effects on Electronic Conductivity and Electrochemical Performance of LiFePO4

Jiezi Hu1), Jian Xie2),  Xinbing Zhao1)†, Hongming Yu1), Xin Zhou1),  Gaoshao Cao1) , Jiangping Tu1)   

  1. 1) State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    2) Department of Chemistry, Mie University, 1577, Kurimamachiyacho, Tsu, Mie 514-8507, Japan
  • Received:2008-02-22 Revised:2009-02-13 Online:2009-05-28 Published:2009-10-10
  • Contact: Xinbing Zhao
  • Supported by:

    the Science-Technology Foundation of Zhejiang Province under grant No. 2007C21100


Olivine-structured pure LiFePO4 and doped Li(M, Fe)PO4 (M=La, Ce, Nd, Mn, Co, Ni) have been synthesized by a solvothermal method. X-ray diffraction and field emission scanning electron microscopy analyses indicate that the as-prepared LiFePO4 is well-crystallized nanopowders without any detectable impurity phases. The electronic conductivity of LiFePO4 is enhanced by around 1-3 orders by doping. It was found that doping alone is not sufficient for the high-rate performance of LiFePO4 and surface coating with such as carbon should be needed. The best dopant for LiFePO4 is Nd among those studied in the present work. Accordingly, doping with 1 mol fraction Nd leads to an increase in 70 mAh/g at 0.1 C for the hydrothermally synthesized sample and 50 mAh/g at 1.0 C after carbon-coating in comparison with the undoped samples.

Key words: Lithium iron phosphate, Doping, Conductivity, Hydrothermal synthesis