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Decomposition of Deep Eutectic Solvent Aids Metals Extraction in Lithium-Ion Batteries Recycling.

The application of Deep Eutectic Solvents (DESs) to dissolve metal oxides in lithium-ion batteries (LIBs) recycling represents a green technological alternative to the mineral acids employed in hydrometallurgical recycling processes. However, DESs are much more expensive than mineral acids and must be reused to ensure economic feasibility of LIB recycling. To evaluate DES reusability, we investigate the role of the choline chloride-ethylene glycol DES decomposition products on metal oxides dissolution. We demonstrate that the temperatures generally applied to carry on this DES leaching induce the formation of decomposition products that ultimately improve the ability to dissolve LIB metal oxides. The characterization of DES decomposition products reveals that the improved metal dissolution is mainly determined by the formation of [[EQUATION]] for which we propose a pivotal role in the oxidative dissolution of LIB metal oxides.