In this paper, a green, efficient and low-cost process for the selective recovery of lithium from spent LiFePO₄ by anodic electrolysis is proposed. The leaching rates of Li, Fe and P under different conditions were explored and the optimal conditions are obtained. In the optimal conditions, Li, Fe and P leaching rates were 96.31%, 0.06% and 0.62% respectively. The Li/Fe selectivity was over 99.9%. The product obtained is isostructural FePO₄ and retains the original particle morphology. The FePO₄ obtained can be synthesised into LiFePO₄/C by direct regeneration process or impurity removal regeneration process. The material synthesized by the latter process has a better electrochemical performance, with a discharge specific capacity of 144.5 mAh/g at 1.0C and a capacity retention of 92.0% over 500cycles. The superior performance can be attributed to an impurity removal process that reduced agglomeration and improved particle morphology.

本文提出了一种绿色、高效、低成本的阳极电解从废旧LiFePO ₄中选择性回收锂的工艺。探讨了不同条件下Li、Fe、P的浸出率，得出最佳浸出条件。在最佳条件下，Li、Fe、P的浸出率分别为96.31%、0.06%和0.62%。 Li/Fe选择性超过99.9%。获得的产物是同结构的FePO ₄并保留了原始颗粒形态。得到的FePO ₄可以通过直接再生工艺或除杂再生工艺合成LiFePO ₄ /C。后一种工艺合成的材料具有更好的电化学性能，1.0C放电比容量为144.5mAh/g，500次循环容量保持率为92.0%。卓越的性能可归因于减少团聚并改善颗粒形态的杂质去除过程。