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Effect of Sintering-method on Electrochemical Performance of LiFePO4/C Cathode Material

Author(s): MOU Fei, YANG Xue-Lin, DAI Zhong-Xu, ZHANG Lu-Lu, WEN Zhao-Yin

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 8;
Start page: 838;
Date: 2012;
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Keywords: sintering; LiFePO4/C; lithium ion batteries; cathode material; electrochemical performance

Static nitrogen atmospheres (SA), dynamic nitrogen atmosphere (DA) and static vacuum (SV) sintering methods were adopted to synthesize LiFePO4/C cathode material. The crystalline structure, morphology and electrochemical performances of the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge/discharge test. Effects of sintering method on crystallinity, particle size, carbon content, reaction temperature and electrochemical performance of the as-obtained LiFePO4/C cathode material are remarkable. SV-sintered LiFePO4/C have better crystalline, but DA-sintering is helpful to obtain LiFePO4/C particles with smaller particle size and narrower particle size distribution, kinetics of Li+ diffusion is also improved. For the DA-sintered sample, sintering temperature can be reduced to 500¡䟷ith excellent electrochemical performance. Specific discharge capacity for the first cycle reaches 163.4 mAh/g at 0.5C rate, and up to 99.02% of discharge capacity can be kept after 50 cycles.

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