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Effects of heating rate on morphology and performance of lithium iron phosphate synthesized by hydrothermal route in organic-free solution

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Abstract

Flake-like LiFePO4 were hydrothermally synthesized in an organic-free solution at heating rates of 0.5, 1.5, 3, and 5 °C min−1. The heating rate has a marked influence on crystal morphology but scarcely on phase purity. The reason for morphology variations is discussed based upon the solubility of precursors Li3PO4 and Fe3(PO4)2·8H2O. The optimum heating rate for hydrothermal synthesis of LiFePO4 is 3 °C min−1. The as-synthesized material exhibits a high specific capacity, excellent rate capability, good low-temperature performance and Li+ diffusivity after carbon coating, all of which could be ascribed to shortened Li+ diffusion distance and higher crystallization degree of the crystalline.

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Authors and Affiliations

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

    Changqing Min, Xiuqin Ou, Zhixiang Shi, Guangchuan Liang & Li Wang

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

    Xiuqin Ou, Guangchuan Liang & Li Wang

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  1. Changqing Min
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Correspondence to Xiuqin Ou.

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Min, C., Ou, X., Shi, Z. et al. Effects of heating rate on morphology and performance of lithium iron phosphate synthesized by hydrothermal route in organic-free solution. Ionics 24, 1285–1292 (2018). https://doi.org/10.1007/s11581-017-2287-3

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  • DOI: https://doi.org/10.1007/s11581-017-2287-3

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