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Influence of iron phosphate on the performance of lithium iron phosphate as cathodic materials in rechargeable lithium batteries

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Abstract

Iron phosphate (FePO4·2H2O) has emerged as the mainstream process for the synthesis of lithium iron phosphate (LiFePO4), whereas FePO4·2H2O produced by different processes also has a great influence on the performance of LiFePO4. In this paper, FePO4·2H2O was produced by two different processes, in which FeSO4 ferrous and Fe(NO3)3·9H2O ferric were used, respectively. After dehydration under the same conditions, a carbon-coated lithium iron phosphate (LiFePO4/C) cathode material was synthesized by a high-temperature solid phase method. The results demonstrated that FePO4·2H2O contained different impurities due to different raw materials, which led to different particle sizes, specific surface areas, microscopic morphology, and crystal structures. The difference of FePO4·2H2O eventually resulted in the difference of LiFePO4/C cathode materials in micro-morphology and crystal structure, which affected the electrochemical performance. Under the premise of comprehensively considering the cost and quality of FePO4·2H2O, improving the purity of FePO4·2H2O is an important method to improve the electrochemical performance of LiFePO4/C cathode materials. Simultaneously, it is also expected to provide theoretical guidance for the preparation of lower-cost and better-quality LiFePO4/C cathode materials.

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Acknowledgements

This work was supported by the National Nature Foundation Regional Joint Fund (U21A20311), the Research Initiation Program for High-level Talents of Sichuan University of Arts and Sciences (2023RC005Z), the Dazhou Science and Technology Program (22ZDYF0047) and the Research Institute of Intelligent Manufacturing Industry Technology of Sichuan University of Arts and Sciences (ZNZZ2304).

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Authors and Affiliations

  1. Intelligent Manufacturing College, Sichuan University of Arts and Sciences, Dazhou, China

    Caihong Zhang, Yan Zhong, Hong Tu, Zhihao Yang, Guangping Chen & Xinghua Zhu

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  1. Caihong Zhang
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  2. Yan Zhong
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  3. Hong Tu
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  4. Zhihao Yang
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  5. Guangping Chen
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Contributions

Caihong Zhang: conceptualization, data curation, formal analysis, funding acquisition, writing – review and editing. Yan Zhong: formal analysis, review and editing. Hong Tu: formal analysis, review and editing. Zhihao Yang: formal analysis, review and editing. Guangping Chen: resources, conceptualization, formal analysis, supervision. Xinghua Zhu: resources, conceptualization, formal analysis, supervision.

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Correspondence to Caihong Zhang, Guangping Chen or Xinghua Zhu.

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Zhang, C., Zhong, Y., Tu, H. et al. Influence of iron phosphate on the performance of lithium iron phosphate as cathodic materials in rechargeable lithium batteries. Ionics (2024). https://doi.org/10.1007/s11581-024-05572-8

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