Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (08): 1498-1502.doi: 10.3866/PKU.WHXB20080829

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Electrochemical Properties of Mo-Doped LiFePO4 Cathode Material

CHEN Yu; WANG Zhong-Li; YU Chun-Yang; XIA Ding-Guo; WU Zi-Yu   

  1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, P. R. China; Biochemical Engineering College of Beijing Union University, Beijing 100023, P. R. China; Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2008-02-04 Revised:2008-03-21 Published:2008-08-06
  • Contact: XIA Ding-Guo; WU Zi-Yu;

Abstract: Mo-doped LiFePO4 was prepared using (NH4)6Mo7O24·4H2O as doping starting material by solid state method under N2 atmosphere. The Mo-doped LiFePO4 samples were characterized by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectrum, extended X-ray absorption fine structure, positron annihilation technique, and electrochemical performance testing at different discharge rates. The results showed that Mo-doped LiFePO4 preserved pure olivine structure. Mo6 + occupied Fe site and Li site simultaneously and the electronic conductivity of LiFePO4 increased. The Mo-doped LiFePO4 had a reversible capacity of 141 mAh·g-1 at 1C discharge rate, and showed good electrochemical properties.

Key words: LiFePO4, Solid-state reaction, Doping-ion, Electronic conductivity