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<p>Lithium iron phosphate (LiFePO<sub>4</sub>) has emerged as a promising cathode material for lithium-ion batteries featured by its inherent safety, long cycle life, and low cost. Recently, iron(III) phosphate dihydrate (FePO<sub>4</sub>⋅2H<sub>2</sub>O) is widely used as the precursor for the synthesis of high-performance LiFePO<sub>4</sub>. The physicochemical properties of FePO<sub>4</sub>⋅2H<sub>2</sub>O critically affect the electrochemical performance of the final LiFePO<sub>4</sub> product. Herein, we systematically investigate the effect of four different iron sources on the material properties of FePO<sub>4</sub>⋅2H<sub>2</sub>O precursors. A comprehensive characterization was performed to analyze the crystal structure, morphology, hydration behavior and surface properties of the FePO<sub>4</sub>⋅2H<sub>2</sub>O precursors. Precursors were subsequently converted into LiFePO<sub>4</sub>/C composites of which phase purity, carbon coating uniformity, and electrochemical properties were studied. The LiFePO<sub>4</sub>/C composite derived from the metallic iron-based precursor demonstrated superior electrochemical performance. The precursor derived from metallic iron can be readily converted to the olivine structure with facile Li<sup>+</sup> diffusion.</p> Graphical Abstract <p></p>

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Comparative Study about Nano-Structured FePO4·2H2O as Precursors for the LiFePO4/C Cathode

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Haneul Hong,
  • Jeongwoo Lim,
  • Subramanian Nithiananth,
  • Jooyoung Lee,
  • Gyu-Seok Choi,
  • Chunjoong Kim

摘要

Lithium iron phosphate (LiFePO4) has emerged as a promising cathode material for lithium-ion batteries featured by its inherent safety, long cycle life, and low cost. Recently, iron(III) phosphate dihydrate (FePO4⋅2H2O) is widely used as the precursor for the synthesis of high-performance LiFePO4. The physicochemical properties of FePO4⋅2H2O critically affect the electrochemical performance of the final LiFePO4 product. Herein, we systematically investigate the effect of four different iron sources on the material properties of FePO4⋅2H2O precursors. A comprehensive characterization was performed to analyze the crystal structure, morphology, hydration behavior and surface properties of the FePO4⋅2H2O precursors. Precursors were subsequently converted into LiFePO4/C composites of which phase purity, carbon coating uniformity, and electrochemical properties were studied. The LiFePO4/C composite derived from the metallic iron-based precursor demonstrated superior electrochemical performance. The precursor derived from metallic iron can be readily converted to the olivine structure with facile Li+ diffusion.

Graphical Abstract