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Enhanced Electrochemical Properties of Cobalt by Varying the Ethylene Glycol - Choline Chloride Composition in a Deep Eutectic Solvent Mixture

Version 2 2024-06-03, 23:16
Version 1 2023-06-07, 05:50
journal contribution
posted on 2024-06-03, 23:16 authored by Isuri N Perera, Jenny PringleJenny Pringle, Kalani Periyapperuma, Anthony SomersAnthony Somers, Amal Siriwardana, Guillermo Pozo, Cristina Pozo-GonzaloCristina Pozo-Gonzalo
The increased demand for portable electronic devices and electric vehicles has resulted in an exponential increase in lithium-ion battery (LIB) waste, and becoming in turn an important secondary source for critical metals. Electrowinning is a commonly used method to recover base and precious metals from a solution, which can also be used to recover valuable metals from spent LIBs. This study unveiled the cobalt electrochemical recovery using model Co sources in increasing amounts of ethylene glycol (EG), 67 molar %, 82 molar % and 100 molar %, in a mixture with choline chloride. The electrochemical results show that increasing the amount of EG together with a small concentration of sulfate anions, in conjunction with chloride anions, in the solution mixture favours the reduction of Co2+. This improved electrochemistry seems to be related to changes of Co2+ speciation easing the reduction process. Additionally, the nature of the Co salt has a significant impact on the recovery efficiency, morphology, and purity of the Co electrodeposit. This work will underpin the science to design safe electrolyte mixtures to enhance the electrochemical recovery of Co2+ in solution from secondary sources.

History

Journal

Journal of The Electrochemical Society

Volume

170

Article number

052503

Location

Pennington, N.J.

ISSN

0013-4651

eISSN

1945-7111

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Issue

5

Publisher

The Electrochemical Society

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