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<p>LiMn<sub>0.8</sub>Fe<sub>0.2</sub>PO<sub>4</sub> (LMFP) cathode has emerged as a promising candidate for high-energy–density lithium-ion batteries due to its cost-effectiveness, high voltage plateau and intrinsic safety. However, drawbacks such as low electrical conductivity, Jahn–Teller effect and Mn<sup>2+</sup> dissolution severely limit its application potential. Herein, we propose a strategy that couples B-F co-doping with HAP@PP separator modification to simultaneously boost the conductivity of LMFP and mitigate Mn<sup>2+</sup> leaching using a facile solid-phase method. The optimized LiMn<sub>0.8</sub>Fe<sub>0.2</sub>P<sub>0.99</sub>B<sub>0.01</sub>O<sub>3.97</sub>F<sub>0.03</sub> (LMFP-BF1) exhibits superior rate capability and excellent cycle stability, which delivers a discharge capacity of 137.4&#xa0;mAh&#xa0;g<sup>−1</sup> and retains 92.6% of that capacity at 1C after 300 cycles. Moreover, HAP@PP separator exhibits an excellent manganese capture effect, which reduces the precipitation of manganese content from 134.647 to 14.056&#xa0;mg&#xa0;kg<sup>−1</sup>. The LMFP-BF1|HAP@PP cell remains a discharge capacity of 140.6&#xa0;mAh&#xa0;g<sup>−1</sup> at 0.5–45&#xa0;℃ after 100 cycles, with a capacity retention rate of 88.31%. This study offers insights into integrating ion doping and separator modification for phosphate-based high-energy–density lithium-ion batteries.</p> Graphical abstract <p>B-F co-doping and modified HAP@PP separator can simultaneously boost the conductivity of LMFP and mitigate Mn<sup>2+</sup> leaching, delivering superior cycling stability.</p>

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Innovative synergy of BF co-doping and modified HAP@PP separator for high-performance LMFP batteries

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Li-Qian Cheng,
  • Yi Gong,
  • Kai Chen,
  • Xuxia Hao,
  • Min Jiang,
  • Yu Dai,
  • Xinyuan Xie

摘要

LiMn0.8Fe0.2PO4 (LMFP) cathode has emerged as a promising candidate for high-energy–density lithium-ion batteries due to its cost-effectiveness, high voltage plateau and intrinsic safety. However, drawbacks such as low electrical conductivity, Jahn–Teller effect and Mn2+ dissolution severely limit its application potential. Herein, we propose a strategy that couples B-F co-doping with HAP@PP separator modification to simultaneously boost the conductivity of LMFP and mitigate Mn2+ leaching using a facile solid-phase method. The optimized LiMn0.8Fe0.2P0.99B0.01O3.97F0.03 (LMFP-BF1) exhibits superior rate capability and excellent cycle stability, which delivers a discharge capacity of 137.4 mAh g−1 and retains 92.6% of that capacity at 1C after 300 cycles. Moreover, HAP@PP separator exhibits an excellent manganese capture effect, which reduces the precipitation of manganese content from 134.647 to 14.056 mg kg−1. The LMFP-BF1|HAP@PP cell remains a discharge capacity of 140.6 mAh g−1 at 0.5–45 ℃ after 100 cycles, with a capacity retention rate of 88.31%. This study offers insights into integrating ion doping and separator modification for phosphate-based high-energy–density lithium-ion batteries.

Graphical abstract

B-F co-doping and modified HAP@PP separator can simultaneously boost the conductivity of LMFP and mitigate Mn2+ leaching, delivering superior cycling stability.