Doping Effects on Electronic Conductivity and Electrochemical Performance of LiFePO4

Abstract

Abstract:

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

Jiezi Hu,Jian Xie,Xinbing Zhao,Hongming Yu,Xin Zhou,Gaoshao Cao,Jiangping Tu. Doping Effects on Electronic Conductivity and Electrochemical Performance of LiFePO₄[J]. J Mater Sci Technol, 2009, 25(03): 405-409.

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Doping Effects on Electronic Conductivity and Electrochemical Performance of LiFePO₄

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