Selective cobalt and nickel electrodeposition for lithium-ion battery recycling through integrated electrolyte and interface control.

ABSTRACT: Molecularly-selective metal separations are key to sustainable recycling of Li-ion battery electrodes. However, metals with close reduction potentials present a fundamental challenge for selective electrodeposition, especially for critical elements such as cobalt and nickel. Here, we demonstrate the synergistic combination of electrolyte control and interfacial design to achieve molecular selectivity for cobalt and nickel during potential-dependent electrodeposition. Concentrated chloride allows for the speciation control via distinct formation of anionic cobalt chloride complex (CoCl₄^2-), while maintaining nickel in the cationic form ([Ni(H₂O)₅Cl]⁺). Furthermore, functionalizing electrodes with a positively charged polyelectrolyte (i.

SUBMITTER: Kim K 

PROVIDER: S-EPMC8590046 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature