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

Abstract

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.

Keywords

iron phosphate residue / reduction leaching / dissolution-reprecipitation / kinetic study

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University of Science and Technology Beijing