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Facile synthesis and electrochemical properties of high tap density LiFePO4/C

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Abstract

A facile way of synthesizing LiFePO4/C with high tap density was introduced. LiFePO4/C composites were synthesized by a combination of wet ball milling, spray drying, and carbothermal reduction technology using inexpensive FePO4. The effect of sphericity of secondary microsphere on electrochemical properties and tap density of LiFePO4/C composite was systematically investigated. The sphericity of the secondary microsphere is controlled by particle size of primary particle with varying the ball grinding time. The composites were characterized in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), and tap density testing. The particle size of primary particle can effectively influence the sphericity of the secondary microsphere, and consequently change the electrochemical properties and tap density of LiFePO4/C. The optimum LiFePO4/C with high tap density of 1.68 g cm−3 contains 2.1 wt% carbon and shows an excellent rate capability and cycle performance, with the initial discharge capacities of 164.0, 159.6, 154.9, 148.3, and 138.3 mAh g−1 at 0.2 C, 0.5 C, 1 C, 2 C, and 5 C. The good electrochemical properties are attributed to the smaller particle, uniform primary particle size distribution, and the uniform carbon coating. The high tap density of LiFePO4/C composite is attributed to the better sphericity of secondary microsphere. With the primary particle size decreasing, the secondary microsphere sphericity is better.

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Authors and Affiliations

  1. Institute of Power Source and Ecomaterials Science, Hebei University of Technology, Tianjin, 300130, China

    Xiaoyan Wang, Lizhi Wen, Yi Zheng, Hao Liu & Guangchuan Liang

  2. Qinggong College, North China University of Science and Technology, Tangshan, 063000, China

    Xiaoyan Wang

  3. Automobile & Rail Transportation School, Tianjin Sino-German University of Applied Sciences, Tianjin, 300350, China

    Lizhi Wen

  4. Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin, 300130, China

    Guangchuan Liang

  5. Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin, 300130, China

    Guangchuan Liang

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  1. Xiaoyan Wang
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  2. Lizhi Wen
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  3. Yi Zheng
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  4. Hao Liu
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  5. Guangchuan Liang
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Correspondence to Guangchuan Liang.

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Wang, X., Wen, L., Zheng, Y. et al. Facile synthesis and electrochemical properties of high tap density LiFePO4/C. Ionics 25, 4589–4596 (2019). https://doi.org/10.1007/s11581-019-03025-1

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  • DOI: https://doi.org/10.1007/s11581-019-03025-1

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