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Effects of surfactant-assisted synthesis Fe3(PO4)2∙8H2O and its purity and morphology on the performance of LiFePO4/C cathode materials

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Abstract

The synthesis of high purity and crystallinity Fe3(PO4)2·8H2O precursor by polyvinyl pyrrolidone (PVP)–assisted co-precipitation method is reported, and the morphology-controlled tiny and uniform primary particles material has also been obtained. Moreover, the fore-mentioned Fe3(PO4)2∙8H2O was used to synthesize LiFePO4/C via carbothermal reduction. All the materials were systematically characterized by various analytical, spectroscopic, and imaging techniques. Fe3(PO4)2∙8H2O exhibits stronger affinities within primary particles and homogeneity, attributed to PVP, which can greatly improve the properties of LiFePO4/C. The resulting high purity Fe3(PO4)2∙8H2O gave highly crystalline of LiFePO4/C. In addition, LiFePO4/C prepared with PVP demonstrated excellent electrochemical performance of initial discharge capacities at 0.2 C, 0.5 C, 1 C, 2 C, and 5 C are 163.4, 160.9, 155.1, 146.2, and 126.5 mAh g−1, respectively.

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Funding

This study was financially supported by the State Natural Science Foundation of Hebei Province (grant number E2015202356).

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Authors and Affiliations

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

    Yi Zheng, Weichao Tian, Jingrui Cao, Kaicheng Zhang, Shiyu Tian, Li Wang & Guangchuan Liang

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

    Li Wang & Guangchuan Liang

  3. 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. Yi Zheng
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  2. Weichao Tian
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  3. Jingrui Cao
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  4. Kaicheng Zhang
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  6. Li Wang
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  7. Guangchuan Liang
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Correspondence to Guangchuan Liang.

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Zheng, Y., Tian, W., Cao, J. et al. Effects of surfactant-assisted synthesis Fe3(PO4)2∙8H2O and its purity and morphology on the performance of LiFePO4/C cathode materials. Ionics 26, 5445–5453 (2020). https://doi.org/10.1007/s11581-020-03698-z

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