Deep eutectic solvent for spent lithium-ion battery recycling: comparison with inorganic acid leaching.

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ID: 276093
2022
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Ranked #60 of 184 articles by views in Physical chemistry chemical physics : PCCP

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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 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.
Reference Key
li2022deepphysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Bensheng;Li, Qingzhu;Wang, Qingwei;Yan, Xuelei;Shi, Miao;Wu, Chao;
Journal Physical chemistry chemical physics : PCCP
Year 2022
DOI
10.1039/d1cp05968h
URL
Keywords
recycling hydrometallurgy wasted alkaline batteries zinc recovery

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