Abstract
To realize efficient recycling of lithium manganese oxide (LMO) from spent Li-ion batteries, microwave-assisted deep-eutectic solvent (DES) treatment is proposed. The effects of the DES, temperature, time, and liquid/solid (L/S) ratio on the leaching efficiency were studied by orthogonal and single-factor experiments. The results of the orthogonal experiments indicated that the effects of each factor on the leaching of Li and Mn ions lay in the following order: DES > L/S ratio > temperature > time. The results of the single-factor experiments indicated that the leaching efficiencies of both Li and Mn ions reached 96% under the condition of choline chloride–oxalic acid (ChCl–OA), 15 min, 75°C, and L/S ratio of 6 g/0.1 g. Microwave-assisted DES treatment is highly efficient for recycling LMO from Li-ion batteries, greatly decreasing the leaching time from several days to less than 1 h even at 75°C in comparison with the traditional heating method.
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Acknowledgements
The authors gratefully acknowledge the contribution of the Xi’an Science and Technology Plan Program (2017xasj1006), and the Key Research and Development Program of 369 Shaanxi Province (2018ZDCXL-GY-10-01).
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Xu, Z., Shao, H., Zhao, Q. et al. Use of Microwave-Assisted Deep Eutectic Solvents to Recycle Lithium Manganese Oxide from Li-Ion Batteries. JOM 73, 2104–2110 (2021). https://doi.org/10.1007/s11837-021-04641-x
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DOI: https://doi.org/10.1007/s11837-021-04641-x