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

doi:10.3724/SP.J.1077.2012.11576

Abstract

Abstract: 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℃ with 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.

Key words: sintering, LiFePO₄/C, lithium ion batteries, cathode material, electrochemical performance

CLC Number:

O613

MOU Fei, YANG Xue-Lin, DAI Zhong-Xu, ZHANG Lu-Lu, WEN Zhao-Yin. Effect of Sintering-method on Electrochemical Performance of LiFePO₄/C Cathode Material[J]. Journal of Inorganic Materials, 2012, 27(8): 838-842.

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

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