ORCID Profile
0000-0001-8451-8648
Current Organisation
Deakin University
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Publisher: American Chemical Society (ACS)
Date: 12-09-2018
Publisher: The Electrochemical Society
Date: 05-2023
Abstract: 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 Co 2+ . This improved electrochemistry seems to be related to changes of Co 2+ 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 Co 2+ in solution from secondary sources.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1GC00361E
Abstract: The application of a fluorine-free ionic liquid electrolyte has enabled cleaner and sustainable Nd recovery via electrodeposition.
Publisher: The Electrochemical Society
Date: 2014
DOI: 10.1149/2.0721414JES
Publisher: The Electrochemical Society
Date: 19-10-2021
Publisher: American Chemical Society (ACS)
Date: 02-09-2020
Publisher: MDPI AG
Date: 17-09-2021
Abstract: Neodymium (Nd) is one of the most essential rare-earth metals due to its outstanding properties and crucial role in green energy technologies such as wind turbines and electric vehicles. Some of the key uses includes permanent magnets present in technological applications such as mobile phones and hard disk drives, and in nickel metal hydride batteries. Nd demand is continually growing, but reserves are severely limited, which has put its continued availability at risk. Nd recovery from end-of-life products is one of the most interesting ways to tackle the availability challenge. This perspective concentrates on the different methods to recover Nd from permanent magnets and rechargeable batteries, covering the most developed processes, hydrometallurgy and pyrometallurgy, and with a special focus on electrodeposition using highly electrochemical stable media (e.g., ionic liquids). Among all the ionic liquid chemistries, only phosphonium ionic liquids have been studied in-depth, exploring the impact of temperature, electrodeposition potential, salt concentration, additives (e.g., water) and solvation on the electrodeposition quality and quantity. Finally, the importance of investigating new ionic liquid chemistries, as well as the effect of other metal impurities in the ionic liquid on the deposit composition or the stability of the ionic liquids are discussed. This points to important directions for future work in the field to achieve the important goal of efficient and selective Nd recovery to overcome the increasingly critical supply problems.
Publisher: Elsevier BV
Date: 05-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA12004A
Abstract: Application of high current density demonstrated enhanced cycling efficiency and the formation of a stable and LiF dominated SEI providing a new path to enable fast charge battery technologies.
Publisher: Wiley
Date: 16-02-2017
No related grants have been discovered for Kalani Periyapperuma.