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- In relation to this article, we declare that there is no conflict of interest.
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Received November 4, 2024
Accepted August 5, 2024
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Recovery of Cobalt from Cathode of Lithium-Ion Battery Using Ternary Deep Eutectic Solvent
Abstract
A new ternary deep eutectic solvents, consisting of choline chloride, ethylene glycol, and benzoic acid, were designed for
effi cient leaching of valuable metals from lithium oxide of spent lithium-ion batteries. The infl uence of experiment parameters
on the leaching of cobalt was systematically investigated and optimized by response surface methodology. The leaching
kinetics were elucidated in detail. The leaching effi ciency of cobalt reached almost 100%, when the temperature was
443.15 K, the time of 3 h, and the molar ratio of the choline chloride: ethylene glycol: benzoic acid of 1:1.6:0.4. The kinetics
of Co leaching showed good agreement to the shrinking core model, in which the diff usion of solid product layers was the
limiting step, and the apparent activation energy was about 77.22 kJ/mol. Infrared spectroscopy indicated that hydrogen
donors provided multiple ligands to facilitate the solubilization of cobalt. The SEM analysis of the leachates showed that the
edge of particles changed signifi cantly, the particle size decreased, and the dissolution process appeared. The simultaneous
realization of high effi ciency green process is expected to bring the DES into practical application for recovery of cathode
from spent lithium-ion batteries.
