Schiavi Pier Giorgio, Altimari Pietro, Sturabotti Elisa, Giacomo Marrani Andrea, Simonetti Giulia, Pagnanelli Francesca
Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro n.5, 00185, Rome, Italy.
ChemSusChem. 2022 Sep 20;15(18):e202200966. doi: 10.1002/cssc.202200966. Epub 2022 Aug 10.
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, the role of the choline chloride-ethylene glycol DES decomposition products on metal oxides dissolution was investigated. The temperatures generally applied to carry on this DES leaching induced the formation of decomposition products that ultimately improved the ability to dissolve LIB metal oxides. The characterization of DES decomposition products revealed that the improved metal dissolution was mainly determined by the formation of Cl , which was proposed to play a pivotal role in the oxidative dissolution of LIB metal oxides.
将深共熔溶剂（DESs）应用于锂离子电池（LIBs）回收中溶解金属氧化物，是湿法冶金回收工艺中使用的无机酸的一种绿色技术替代方案。然而，DESs比无机酸贵得多，必须进行再利用以确保LIB回收的经济可行性。为了评估DES的可再利用性，研究了氯化胆碱 - 乙二醇DES分解产物对金属氧化物溶解的作用。通常用于进行这种DES浸出的温度会诱导分解产物的形成，这些分解产物最终提高了溶解LIB金属氧化物的能力。DES分解产物的表征表明，金属溶解能力的提高主要取决于Cl 的形成，Cl 被认为在LIB金属氧化物的氧化溶解中起关键作用。
