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LiFePO4/C composites derived from precipitated FePO4 precursor: effects of mixing processes

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Abstract

Grinding, general incipient wetness and competitive incipient wetness were investigated on the preparation of LiFePO4/C (LFP) composites from precipitated FePO4 precursor. This article focuses on the fundamental details of mixing processes for LFP production, of which the literature is sparse. The structure features of LiFePO4/C composites were analyzed by X-ray diffraction (XRD), while the morphologies were characterized by field emission scanning electron microscopy (FESEM). The electrochemical performances were studied by galvanostatic charge/discharge measurements. Both mixing processes and lithium sources are capable of affecting the electrochemical performances by altering the crystallinity, the quality of carbon coating, or even the impurity formation of LiFePO4/C composites. Liquid alkalis caused the formation of impurities and mild decrease of crystallinity, whereas competitive cations did not produce impurities but significantly decreased the crystallinity of LiFePO4/C composites.

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Acknowledgments

We thank the projects sponsored by the Henan Provincial Foundation for University Youth Key Faculty (2013GGJS-112), Henan Provincial Scientific Research Foundation for the Returned Overseas Scholars, Zhengzhou Science & Technology Project (10PTGG381-2), and Research Funding for Ph.D. Faculty of Zhengzhou University of Light Industry.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China

    Zhenxin Liu

  2. Henan Provincial Key Laboratory of Surface and Interface Science, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, China

    Zhenxin Liu, Jingjing Li, Yu Xing, Lizhen Wang, Shaoming Fang & Bei Xu

  3. School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China

    Xiongwei Qu

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  1. Zhenxin Liu
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  2. Jingjing Li
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  3. Yu Xing
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  4. Lizhen Wang
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  5. Shaoming Fang
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  6. Bei Xu
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  7. Xiongwei Qu
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Correspondence to Yu Xing, Shaoming Fang or Xiongwei Qu.

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Liu, Z., Li, J., Xing, Y. et al. LiFePO4/C composites derived from precipitated FePO4 precursor: effects of mixing processes. Ionics 20, 1511–1516 (2014). https://doi.org/10.1007/s11581-014-1110-7

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  • DOI: https://doi.org/10.1007/s11581-014-1110-7

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