Deep eutectic solvent for spent lithium-ion battery recycling: comparison with inorganic acid leaching. Issue 32 (8th August 2022)

• Record Type: Journal Article
• Authors: Li, Bensheng; Li, Qingzhu; Wang, Qingwei; Yan, Xuelei; Shi, Miao; Wu, Chao
• Is Part Of: Physical chemistry chemical physics. Volume 24:Issue 32(2022)
• Page Start: 19029
• Page End: 19051
• Publication Date: 2022-08-08
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d1cp05968h
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Deep eutectic solvents (DESs) as novel green solvents are potential options to replace inorganic acids for hydrometallurgy. Abstract : Deep eutectic solvents (DESs) as novel green solvents are potential options to replace inorganic acids for hydrometallurgy. Compared with inorganic acids, the physicochemical properties of DESs and their applications in recycling of spent lithium-ion batteries were summarized. The viscosity, metal solubility, toxicological properties and biodegradation of DESs depend on the hydrogen bond donor (HBD) and acceptor (HBA). The viscosity of ChCl-based DESs increased according to the HBD in the following order: alcohols < carboxylic acids < sugars < inorganic salts. The strongly coordinating HBDs increased the solubility of metal oxide via surface complexation reactions followed by ligand exchange for chloride in the bulk solvent. Interestingly, the safety and degradability of DESs reported in the literature are superior to those of inorganic acids. Both DESs and inorganic acids have excellent metal leaching efficiencies (>99%). However, the reaction kinetics of DESs are 2–3 orders of magnitude slower than those of inorganic acids. A significant advantage of DESs is that they can be regenerated and recycled multiple times after recovering metals by electrochemical deposition or precipitation. In the future, the development of efficient and selective DESs still requires a lot of attention.