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Enhanced electrochemical performance of LiFePO4/C prepared by sol–gel synthesis with dry ball-milling

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Abstract

LiFePO4/C was prepared by a modified aqueous sol–gel route developed by incorporating an additional ball-milling step where the dry gel was milled with the additives of synthetic graphite and carbon black. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM), high resolution TEM (HRTEM) and elemental analysis. Results showed that the LiFePO4/C synthesized by suitable ball-milling process had pure, fine and homogenous LiFePO4 particles. Results of cyclic voltammetry and charge/discharge plateaus demonstrated that the LiFePO4/C composite synthesized by milling for 2 h had much better electrochemical kinetics. High performances were achieved with its discharge capacities of 157 mA h g−1 at 0.1 C and 133 mA h g−1 at 1 C between 2.5 and 4.2 V (1 C = 170 mA g−1). And no obvious capacity fading was observed upon cycling. The simple and convenient synthesis route is promising for large-scale production of LiFePO4/C.

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Acknowledgements

This work was financially supported by Project of Taizhou Science and Technology Plan (102XCP07), Scientific Research Fund of Zhejiang Provincial Education Department (Y201016923).

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Authors and Affiliations

  1. College of Physics and Electronic Engineering, Taizhou University, Taizhou, 318000, China

    Yan Lin, Jianbo Wu & Weiping Chen

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  1. Yan Lin
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  2. Jianbo Wu
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  3. Weiping Chen
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Correspondence to Yan Lin.

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Lin, Y., Wu, J. & Chen, W. Enhanced electrochemical performance of LiFePO4/C prepared by sol–gel synthesis with dry ball-milling. Ionics 19, 227–234 (2013). https://doi.org/10.1007/s11581-012-0735-7

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  • DOI: https://doi.org/10.1007/s11581-012-0735-7

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