Synthesis and Electrochemical Performance of LiFePO4/C Cathode Materials Using Fe Powder

doi:10.15541/jim20150583

Abstract

Abstract:

Using Fe source as starting material, the composite LiFePO₄/C material was obtained through a combined method of nano grinding, spray drying and high temperature calcinating. The as-prepared samples were verified by TG/DSC and XRD and characterized by SEM and Mossbauer spectrum. The electrochemical performances were studied by CV and cyclic tests. The results show that the LiFePO₄/C composite is successfully synthesized by calcinating the precursor at 500-700℃. The obtained LiFePO₄/C materials are spherical porous agglomerates with mean size of 4-5 μm, which are composed of 200 nm particles. According to Mössbauer data, all the iron ions are in +2 valence state. The spherical nano LiFePO₄/C composite shows great electrochemical performance as potential cathode material for lithium ion batteries, with a specific capacity of 156 mAh/g at 1C rate and capacity retention of 92.8% after 300 charge/discharge cycles.

Key words: LiFePO4, nano grinding, Mossbauer spectrum, specific capacity, cyclic performance

CLC Number:

TQ73

MENG Fang-Li, ZHANG Dong-Yun, CHANG Cheng-Kang, XU Jia-Yue, KAMZIN A S. Synthesis and Electrochemical Performance of LiFePO₄/C Cathode Materials Using Fe Powder[J]. Journal of Inorganic Materials, 2016, 31(8): 802-806.

Figures/Tables 5

Fig. 1 XRD pattern (a) and TG-DSC curves (b) of the as-sprayed precursor

Fig. 2 XRD patterns of LiFePO4/C composites calcined at different temperatures

Fig. 3 SEM images of precursor (a, c) and as-calcined LiFePO4/C composite (b, d)

Fig. 4 Mössbauer spectra of precursor (a) and as-calcined LiFePO4/C powder (b)

Fig. 5 (a) CV curve, (b) first runs at different rates and (c) cyclic performances of LiFePO4/C composite

References 19

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Synthesis and Electrochemical Performance of LiFePO₄/C Cathode Materials Using Fe Powder

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