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Acta Phys. -Chim. Sin.  2009, Vol. 25 Issue (11): 2186-2190    DOI: 10.3866/PKU.WHXB20091113
Article     
Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO4/C Composites
YU Hong-Ming, ZHENG Wei, CAO Gao-Shao, ZHAO Xin-Bing
Department of Materials Science and Engineering, Zhejing University, Hangzhou 310027, P. R. China
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Abstract  

The structure and morphology of coating carbon play an important role in improving the electronic conductivity of lithium iron phosphate. LiFePO4/C composites were synthesized using an in-situ solid state method while polypropylene and glucose were used as carbon sources. Ferrocene was used as a catalyst precursor to graphitize the pyrolytic carbon. The microstructure and morphology of lithium iron phosphate together with the amounts and structure of the coating carbon were investigated in detail. It is shown that the pyrolysis of polypropylene forms well graphitized carbon-coatings and thus improves the high-rate performance of the material. Ferrocene is effective in optimizing the carbon structure. A LiFePO4/C composite with an excellent high-rate capacity of 145 mAh·g-1 at 10C (1C=170 mA·g-1) was synthesized.



Key wordsCathode material      LiFePO4      Carbon coating      Griphitization      Ferrocene     
Received: 19 May 2009      Published: 18 September 2009
MSC2000:  O646  
Corresponding Authors: ZHAO Xin-Bing     E-mail: Zhaoxb@zju.edu.cn
Cite this article:

YU Hong-Ming, ZHENG Wei, CAO Gao-Shao, ZHAO Xin-Bing. Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO4/C Composites. Acta Phys. -Chim. Sin., 2009, 25(11): 2186-2190.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20091113     OR     http://www.whxb.pku.edu.cn/Y2009/V25/I11/2186

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