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Acta Physico-Chimica Sinica  2005, Vol. 21 Issue (03): 319-323    DOI: 10.3866/PKU.WHXB20050319
Note     
Influence of Mg Ion Doping on the Battery Properties of LiFePO4/C
LU Jun-Biao; TANG Zi-Long; ZHANG Zhong-Tai; JIN Yong-Zhu
State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084
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Abstract  LiFePO4/C doped by Mg ion was obtained by solid phase reaction synthesis route with PVA (polyvinyl alcohol) coating processing. Conduction properties at different temperatures and resistivity change at different dopant contents indicate that conduction mechanism of LiFePO4 will change from n type to p type along with the increasing of doping content. Crystallization of LiFePO4/C with the dopant content of 0.3%(x) at different synthesis temperatures was characterized. For the sample synthesized at 973 K, the particles with a diameter of several hundred nanometers together with carbon decomposed by PVA formed secondary particles with a diameter of 10 micrometer. Along with curves of cyclic voltammetry, two shoulder-peaks showed that another way for lithium ion extraction/ insertion in cathode existed. When batteries were cycled at a rate of 0.1 C, the charge and discharge curves showed flat work voltages and large capacities. When the charge-discharge rate was increased to 0.5 C, LiFePO4 covered by carbon and doped by Mg ion showed capacity of more than 120 mA•h•g-1. After 100 cycles, the capacity fade was neglectable.

Key wordsCathode material      LiFePO4      Granulating processing      Mg ion doping     
Received: 08 July 2004      Published: 15 March 2005
Corresponding Authors: ZHANG Zhong-Tai     E-mail: zzt@mail.tsinghua.edu.cn
Cite this article:

LU Jun-Biao; TANG Zi-Long; ZHANG Zhong-Tai; JIN Yong-Zhu. Influence of Mg Ion Doping on the Battery Properties of LiFePO4/C. Acta Physico-Chimica Sinica, 2005, 21(03): 319-323.

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http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20050319     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2005/V21/I03/319

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