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Article Abstract
Efficient and clean extraction lithium (Li) from spent LiFePO batteries (LIBs) still remains a challenge. In this paper, a green deep eutectic solvent (DES) based on ethylene glycol (EG) and choline chloride (CC), combined with ozone (O) from air source, realized highly selective leaching Li from LiFePO in situ for the first time. The influence of experimental parameters on Li and Fe leaching efficiencies (η, η) were studied by orthogonal and single-factor tests, and η ≥ 92.2% while η ≤ 1.6% were obtained under the optimal conditions (6 h, 20 g/L, 8EG:1CC, 40 °C). The impurity Fe in the filtrate was completely precipitated as amorphous FePO·3HO after heating (150 °C, 0.5 h), achieving a pure Li-solution. The leaching mechanism elucidated that the synergistic effect (acidification, replacement and oxidation reaction) between the DES and O determined the phase transition of Li and Fe, promoting the efficient selective extraction of Li and in-situ separation of Fe (FePO). The average η and η were separately 85.4% and 2.0% after ten cycles of the 8EG:1CC, indicative of its' excellent reusability. Meanwhile, LiCl was recovered from the filtrate. This process avoided the use of strong acid/alkali and discharge of waste water, providing fresh perspectives on the green recovery of spent LiFePO batteries.
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| http://dx.doi.org/10.1016/j.envres.2023.117393 | DOI Listing |
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