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Influence of synthesis parameters on the properties of FePO4·2H2O used for the precursor of LiFePO4 cathode material

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Abstract

A series of FePO4·2H2O particles were prepared via rapid precipitation method for process parameters optimizing. The influences of surfactant type, its amount, aging time, and ultrasound time were systematically investigated. The obtained FePO4·2H2O particles were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FTIR), and iron–phosphorus ratio (n(Fe):n(P)). Results show that surfactant, aging time, and ultrasound time have significant effects on the agglomeration and morphology of FePO4·2H2O particles. The best conditions for preparing FePO4·2H2O particles with good dispersity are surfactant CTAB with adding 1.5% of the iron powder mass, 4 h aging, and 60 min of ultrasonic treatment, respectively. This work suggests that the optimized rapid precipitation method is a promising method to synthesize FePO4·2H2O used in industrialization.

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Acknowledgments

Financial support from the National Natural Science Foundation of China (Grant No. 51364021), the Project of Natural Science Foundation of Yunnan Province (Grant No. 2018HB012), and the Program for Innovative Research Team in the University of Ministry of Education of China (No. IRT_17R48) are gratefully acknowledged by the authors.

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Authors and Affiliations

  1. School of Metallurgy and Mining, Kunming Metallurgy College, Yunnan Province, 650033, Kunming, China

    Li Yongjia

  2. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, Yunnan Province, China

    Li Yin, Zhang Keyu, Xu Ruhui, Yuan Meimei & Yao Yaochun

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  1. Li Yongjia
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  2. Li Yin
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  3. Zhang Keyu
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  4. Xu Ruhui
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  5. Yuan Meimei
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  6. Yao Yaochun
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Correspondence to Yuan Meimei or Yao Yaochun.

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Yongjia, L., Yin, L., Keyu, Z. et al. Influence of synthesis parameters on the properties of FePO4·2H2O used for the precursor of LiFePO4 cathode material. Ionics 27, 983–991 (2021). https://doi.org/10.1007/s11581-020-03864-3

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