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<p>The effective reuse of iron phosphate residue (IPR) is the key issue in the recycling of spent LiFePO<sub>4</sub> batteries. Therefore, in this study, the reduction leaching of IPR in H<sub>2</sub>SO<sub>4</sub> solution by adding iron powder as reducing agent was investigated and compared with direct leaching. The results show that the leaching rate of IPR reached 97% under the optimum reduction leaching conditions. Kinetic studies show that the activation energy for reduction leaching is 12.71 kJ/mol, while that of direct leaching is 21.57 kJ/mol. Moreover, the reduction leaching time is reduced by half and the acid consumption is reduced by 30% compared to direct leaching with the same leaching rate. This work provides a scientific guidance to the treatment of iron phosphate residue from the recycling of spent LiFePO<sub>4</sub> batteries.</p>

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High efficiency reduction leaching of iron phosphate residue from the recycling of spent LiFePO4 battery

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Huaijun Liu,
  • Liangxing Jiang,
  • Hengfa Ni,
  • Shenghai Yang,
  • Zongliang Zhang,
  • Fangyang Liu

摘要

The effective reuse of iron phosphate residue (IPR) is the key issue in the recycling of spent LiFePO4 batteries. Therefore, in this study, the reduction leaching of IPR in H2SO4 solution by adding iron powder as reducing agent was investigated and compared with direct leaching. The results show that the leaching rate of IPR reached 97% under the optimum reduction leaching conditions. Kinetic studies show that the activation energy for reduction leaching is 12.71 kJ/mol, while that of direct leaching is 21.57 kJ/mol. Moreover, the reduction leaching time is reduced by half and the acid consumption is reduced by 30% compared to direct leaching with the same leaching rate. This work provides a scientific guidance to the treatment of iron phosphate residue from the recycling of spent LiFePO4 batteries.