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<p>With the surging demand for lithium-ion batteries (LIBs), the recycling of spent LIBs has emerged as a critical endeavor for resource reuse and environmental protection. This study focuses on ion separation in the synergistic leaching solution derived from LiFePO<sub>4</sub> (LFP) and LiMn<sub>2</sub>O<sub>4</sub> (LMO) batteries, with the objective of efficiently removing Mn, Fe, and P while recovering Li and Mn. Analysis of the Eh-pH diagram confirms the feasibility of stepwise precipitation through pH regulation. Under optimal conditions (pH 8, temperature 40°C, sodium carbonate concentration 0.75 mol/L, and reaction time 60 min), sodium carbonate as the precipitant achieves precipitation efficiencies of 99.49% for Fe, 99.89% for <i>P</i>, and 99.89% for Mn, with a Li loss rate as low as 0.148%. Characterizations via X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) reveal that the precipitated product is spherical MnCO<sub>3</sub> which can be converted into polyhedral Mn<sub>3</sub>O<sub>4</sub> upon calcination. The lithium-rich filtrate, after further treatment, yields columnar Li<sub>2</sub>CO<sub>3</sub> that meets the specifications for crude lithium carbonate. This method offers an efficient and environmentally benign technical route for the recovery of Mn and Li from spent LIBs, thereby contributing to sustainable resource cycling and mitigating environmental impacts-aligning with the principles of cleaner production.</p>

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Efficient Removal of Manganese, Iron, and Phosphorus from Synergistic Leaching Solution of Spent LiFePO4 and LiMn2O4 Batteries via Stepwise Precipitation: Facilitating High-Value Recovery of Lithium and Manganese

  • 期刊论文

  • 发表日期：

    2025年11月23日

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  • Zhongtang Zhang,
  • Renhang Lu,
  • Ruguo Yan,
  • Zhilou Liu,
  • Huanping Nie,
  • Ruixiang Wang,
  • Zhifeng Xu,
  • Kang Yan

摘要

With the surging demand for lithium-ion batteries (LIBs), the recycling of spent LIBs has emerged as a critical endeavor for resource reuse and environmental protection. This study focuses on ion separation in the synergistic leaching solution derived from LiFePO4 (LFP) and LiMn2O4 (LMO) batteries, with the objective of efficiently removing Mn, Fe, and P while recovering Li and Mn. Analysis of the Eh-pH diagram confirms the feasibility of stepwise precipitation through pH regulation. Under optimal conditions (pH 8, temperature 40°C, sodium carbonate concentration 0.75 mol/L, and reaction time 60 min), sodium carbonate as the precipitant achieves precipitation efficiencies of 99.49% for Fe, 99.89% for P, and 99.89% for Mn, with a Li loss rate as low as 0.148%. Characterizations via X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) reveal that the precipitated product is spherical MnCO3 which can be converted into polyhedral Mn3O4 upon calcination. The lithium-rich filtrate, after further treatment, yields columnar Li2CO3 that meets the specifications for crude lithium carbonate. This method offers an efficient and environmentally benign technical route for the recovery of Mn and Li from spent LIBs, thereby contributing to sustainable resource cycling and mitigating environmental impacts-aligning with the principles of cleaner production.