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Acta Physico-Chimica Sinica  2004, Vol. 20 Issue (06): 582-586    DOI: 10.3866/PKU.WHXB20040606
Article     
Effect on the Electrochemical Performance of Lithium Iron Phosphate by Cr3+ Ion Doping
Ni Jiang-Feng;Zhou Heng-Hui;Chen Ji-Tao;Su Guang-Yao
College of Chemistry and Molecular Engineering, Peking University, Beijing 100871;College of Chemistry, Xiangtan University, Xiangtan 411105
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Abstract  Two different methods(mechanical ball-milling and co-precipitation)were applied to prepare lithium iron phosphate(LiFePO4) containing low concentration(1%, mole fraction) Cr3+ ion dopant. The samples were characterized by X-ray diffraction and scanning electron microscope, and their electrochemical performances were investigated including cycling behavior and large current discharging. The results indicate that the Cr3+ ion dopant does not affect the structure of the material but considerably improves its kinetics in terms of capacity delivery and cycle performance. At a low discharging rate (0.1 C), LiFePO4 samples doping via mechanical ball-milling and co-precipitation are capable of delivering reversible specific capacities of 144 mAh•g-1 and 158 mAh•g-1 respectively, with fairly stable cycleability. Even at a 2 C discharging rate, they can show capacities of 110 mAh•g-1 and 130 mAh•g-1 respectively, too. The results also confirm that doping via co-precipitation with Fe sources is an effective method to improve the ion doping effect.

Key wordsLithium iron phosphate      Co-precipitation      Ion doping      Electronic conductivity      Lithium intercalation capacity      Positive electrode material     
Received: 10 December 2003      Published: 15 June 2004
Corresponding Authors: Zhou Heng-Hui     E-mail: hhzhou@chem.pku.edu.cn
Cite this article:

Ni Jiang-Feng;Zhou Heng-Hui;Chen Ji-Tao;Su Guang-Yao. Effect on the Electrochemical Performance of Lithium Iron Phosphate by Cr3+ Ion Doping. Acta Physico-Chimica Sinica, 2004, 20(06): 582-586.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20040606     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2004/V20/I06/582

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