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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 4: 631 - 636

DOI: https://doi.org/10.3724/SP.J.1077.2007.00631

Research Paper

Synthesis and Electrochemical Performances of LiFePO4/C Composites by Solid State Reduction Method

  • XIE Hui ,
  • ZHOU Zhen-Tao
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  • 1. Electrochemical and Biologic Department, Zhong Shan College, University of Electronic Science and Technology of China, Zhongshan 528402, China; 2. College of Material Science & Engineering, South China University of Technology, Guangzhou 510640, China

Received date: 2006-08-07

  Revised date: 2006-10-09

  Online published: 2007-07-20

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Abstract

The LiFePO4/C composite cathode materials for lithiumion batteries were synthesized by a solid state reduction method. The crystalline structure, morphology of particles, and electrochemical performance of the sample were investigated by -ray diffraction, scanning electron microscope, charge-discharge test and cyclic voltammetry. The results show that the composite synthesized at 700℃ has a simple pure olivetype phase with small particles, and uniformly distribution of gain sizes, and shows the best electrochemical performances with 1st discharge specific capacity 150.3mAh/g and 20 th discharge specific capacity retention ratio 99.2% at 0.1C rate. It also shows good rate capability with 131.4mAh/g, 122.1mAh/g at the high rate of 1.0C and 2.0C, respectively. With the excellent characteristic to resist overcharge, this composite can retain its microstructure even after long time overcharge, but it is vulnerable to overdischarge.

Key words： lithium-ion batteries; lithium iron phosphate; solid state reduction

Cite this article

XIE Hui , ZHOU Zhen-Tao . Synthesis and Electrochemical Performances of LiFePO4/C Composites by Solid State Reduction Method[J]. Journal of Inorganic Materials, 2007 , 22(4) : 631 -636 . DOI: 10.3724/SP.J.1077.2007.00631

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