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<p>Olivine-type LiFePO<sub>4</sub> (LFP) has become the mainstream choice of cathode material for Li-ion power batteries due to its excellent safety and long cycle life. However, its lower electronic conductivity and Li-ion diffusion coefficient limit the potential for further commercialization applications. In this study, Mn ion-doped LiFe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>PO<sub>4</sub>/C composites were designed and prepared. The incorporation of Mn ions induced lattice distortion in LFP, significantly enhancing its electrochemical performance. Both experimental results and theoretical calculations demonstrated that optimal Mn<sup>2+</sup> doping expanded Li<sup>+</sup> diffusion pathways, reduced diffusion resistance, and improved both the Li<sup>+</sup> diffusion rate and electronic conductivity. At 1 C current density, LiFe<sub>1−<i>x</i></sub>Mn<sub><i>x</i></sub>PO<sub>4</sub>/C exhibits a discharge specific capacity of up to 149.4&#xa0;mA&#xa0;h&#xa0;g<sup>−1</sup>. This work provides an efficient and scalable strategy for improving the performance of electrode materials, offering valuable insights for advancing the development of high-performance lithium-ion batteries.</p>

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Adding the Finishing Touch: Introduction of Mn2+ to Accelerate LiFePO4 Reaction Kinetics for a High-Performance Lithium-Ion Battery Cathode

  • 期刊论文

  • 发表日期：

    2025年2月15日

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  • Shengkun Jia,
  • Jinxia Nong,
  • Ziyin Lu,
  • Fangan Liang,
  • Shenglin Zhong,
  • Zhengguang Zou,
  • Shuchao Zhang

摘要

Olivine-type LiFePO4 (LFP) has become the mainstream choice of cathode material for Li-ion power batteries due to its excellent safety and long cycle life. However, its lower electronic conductivity and Li-ion diffusion coefficient limit the potential for further commercialization applications. In this study, Mn ion-doped LiFe1−xMnxPO4/C composites were designed and prepared. The incorporation of Mn ions induced lattice distortion in LFP, significantly enhancing its electrochemical performance. Both experimental results and theoretical calculations demonstrated that optimal Mn2+ doping expanded Li+ diffusion pathways, reduced diffusion resistance, and improved both the Li+ diffusion rate and electronic conductivity. At 1 C current density, LiFe1−xMnxPO4/C exhibits a discharge specific capacity of up to 149.4 mA h g−1. This work provides an efficient and scalable strategy for improving the performance of electrode materials, offering valuable insights for advancing the development of high-performance lithium-ion batteries.