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Acta Phys. -Chim. Sin.  2009, Vol. 25 Issue (08): 1504-1510    DOI: 10.3866/PKU.WHXB20090728
Article     
Electrochemical Performance of High-Density LiFePO4/C Composites Synthesized by Solid State-Carbothermal Reduction Method
ZHONG Mei-E, ZHOU Zhi-Hui, ZHOU Zhen-Tao
College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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Abstract  

High-density LiFePO4/C composites were successfully synthesized by a solid state-carbothermal reduction method using Fe2O3 and citrate ferric as Fe3+ precursors in which the citrate acid radical acted as both reducing agent and carbon source. The reaction mechanism was investigated using thermogravimetric and differential scanning calorimetry (TG-DSC). The structures and physicochemical properties of the LiFePO4/C composites were characterized by X-ray diffraction, scanning electron microscopy, laser particle-size distribution measurement, tap-density testing and galvanostatic charge-discharge. Results indicated that the material calcined at 700 ℃ possessed a crystal olivine structure, a moderate particle size, excellent electrochemical performance and a high tap-density. It had a high initial discharge capacity of 129 mAh·g-1 at 17 mA·g-1 charge-discharge current density without decaying after twenty cycles. This material, which had a multi-peak particle size distribution, consisted of nanometer-sized and micrometer-sized particles and had high tap-density of 1.41 g·cm-3.



Key wordsLi-ion battery      Cathode material      LiFePO4      Carbothermal reduction method      Citrate ferric     
Received: 12 January 2009      Published: 07 May 2009
MSC2000:  O646  
Corresponding Authors: ZHOU Zhen-Tao     E-mail: mcztzhou@scut.edu.cn
Cite this article:

ZHONG Mei-E, ZHOU Zhi-Hui, ZHOU Zhen-Tao. Electrochemical Performance of High-Density LiFePO4/C Composites Synthesized by Solid State-Carbothermal Reduction Method. Acta Phys. -Chim. Sin., 2009, 25(08): 1504-1510.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20090728     OR     http://www.whxb.pku.edu.cn/Y2009/V25/I08/1504

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