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Title: |
Electrochemical Properties of LiFePO4 Synthesized by Sol-gel Approach Using PEG as a Surfactant |
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Source: |
Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)
(pp 732-736)
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Author(s): |
Zhao-cong Wu, National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of
Rui-an Huang, National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of
Xiao-ling Zhou, National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of
Bin Yang, National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of
Yong-nian Dai, National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of |
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Abstract: |
Mesoporous LiFePO4 was synthesized through sol-gel approach by employing CH3COOLi·2H2O, FeCl3·6H2O, NH4H2PO4, sucrose as raw materials, PEG as a surfactant. The sample was characterized by X-ray diffraction(XRD), scanning electron microscope(SEM) and N2-adsorption/desorption isotherms(BET). Its electrochemical performance was investigated and compared with LiFePO4 synthesized by solid state approach. The results indicated that the material synthesized through sol-gel approach has loosely mesoporous structure with homogenous pore distribution. The specific surface area is high up to 48.69m2/g. The material exhibits better electrochemical performance than the material synthesized by solid state approach. Under discharge rates of 0.2C, 1C, 5C, 10C, the specific discharge capacity reaches up to 143.8, 133.1, 124.1, 117.0 mAh/g, respectively. It has good capacity retention of 99.2% after 100 cycles.
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