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<p>LiMn<sub>x</sub>Fe<sub>1−x</sub>PO<sub>4</sub> (LMFP) suffers from low electronic conductivity and inferior electrochemical kinetics, limiting its practical application in lithium-ion batteries. This study proposes a cobalt doping strategy to modify LMFP nanoparticles via a two-step process, inducing lattice parameter reduction and lattice contraction to enhance the cathode material’s electrical conductivity and lithium ion diffusion coefficient. X-ray diffraction (XRD) refinement confirms successful incorporation of Co<sup>2+</sup> into the LMFP lattice. The optimized 2% Co-doped sample (Co-D2) exhibited enhanced electronic conductivity (3.33 × 10<sup>− 3</sup> S/cm), improved Li<sup>+</sup> diffusion coefficient, and reduced charge transfer resistance. Electrochemical tests showed Co-D2 delivered a reversible capacity of 158.76 mAh/g at 0.1&#xa0;C, retained 108.39 mAh/g at 5&#xa0;C, and maintained 91.21% capacity after 230 cycles at 1&#xa0;C. This doping regulation strategy significantly enhances the rate performance and cycling stability of LMFP, opening a promising new pathway for high-performance cathode materials in lithium-ion batteries.</p>

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Co-doped LiMn0.4Fe0.6PO4@C via two-step synthesis for advanced Li-Ion battery cathodes

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yuanlong Shi,
  • Xida Li,
  • Lijun Liu,
  • Zhonglin Li,
  • Jialong Shen,
  • Jie Wang,
  • Yingxinjie Wang,
  • Jie Zhu,
  • Yibing Li

摘要

LiMnxFe1−xPO4 (LMFP) suffers from low electronic conductivity and inferior electrochemical kinetics, limiting its practical application in lithium-ion batteries. This study proposes a cobalt doping strategy to modify LMFP nanoparticles via a two-step process, inducing lattice parameter reduction and lattice contraction to enhance the cathode material’s electrical conductivity and lithium ion diffusion coefficient. X-ray diffraction (XRD) refinement confirms successful incorporation of Co2+ into the LMFP lattice. The optimized 2% Co-doped sample (Co-D2) exhibited enhanced electronic conductivity (3.33 × 10− 3 S/cm), improved Li+ diffusion coefficient, and reduced charge transfer resistance. Electrochemical tests showed Co-D2 delivered a reversible capacity of 158.76 mAh/g at 0.1 C, retained 108.39 mAh/g at 5 C, and maintained 91.21% capacity after 230 cycles at 1 C. This doping regulation strategy significantly enhances the rate performance and cycling stability of LMFP, opening a promising new pathway for high-performance cathode materials in lithium-ion batteries.