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Structural and electrochemical characterization of LiFePO4/C prepared by a sol–gel route with long- and short-chain carbon sources

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Abstract

A fast and convenient sol–gel route was developed to synthesize LiFePO4/C composite cathode material, and the sol–gel process can be finished in less than an hour. Polyethyleneglycol (PEG), d-fructose, 1-hexadecanol, and cinnamic acid were firstly introduced to non-aqueous sol–gel system as structure modifiers and carbon sources. The samples were characterized by X-ray powder diffraction, field emission scanning electron microscopy, and elemental analysis measurements. Electrochemical performances of LiFePO4/C composite cathode materials were characterized by galvanostatic charge/discharge and AC impedance measurements. The material obtained using compound additives of PEG and d-fructose presented good electrochemical performance with a specific capacity of 157.7 mAh g−1 at discharge rate 0.2 C, and the discharge capacity remained about 153.6 mAh g−1 after 50 cycles. The results indicated that the improved electrochemical performance originated mainly from the microporous network structure, well crystalline particles, and the increased electronic conductivity by proper carbon coating (3.11%).

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Acknowledgments

This work was financially supported by the 2007 Annual Key Project of Anhui Province of China (No. 07020203003) and Major Scientific and Technological Issues of Anhui Province of China (No. 07010202032).

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Authors and Affiliations

  1. School of Chemical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China

    Xueliang Li, Weidong Wang, Chengwu Shi, Hua Wang & Yan Xing

  2. Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China

    Xueliang Li, Weidong Wang, Chengwu Shi, Hua Wang & Yan Xing

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  1. Xueliang Li
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  2. Weidong Wang
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  3. Chengwu Shi
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  4. Hua Wang
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Correspondence to Xueliang Li.

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Li, X., Wang, W., Shi, C. et al. Structural and electrochemical characterization of LiFePO4/C prepared by a sol–gel route with long- and short-chain carbon sources. J Solid State Electrochem 13, 921–926 (2009). https://doi.org/10.1007/s10008-008-0629-9

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  • DOI: https://doi.org/10.1007/s10008-008-0629-9

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