Understanding the Behaviors of λ-MnO2in Electrochemical Lithium Recovery: Key Limiting Factors and a Route to the Enhanced Performance

Seoni Kim, Jin Soo Kang, Hwajoo Joo, Yung Eun Sung, Jeyong Yoon

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Recently developed electrochemical lithium recovery systems, whose operation principle mimics that of lithium-ion battery, enable selective recovery of lithium from source waters with a wide range of lithium ions (Li+) concentrations; however, physicochemical behaviors of the key component - Li+-selective electrode - in realistic operation conditions have been poorly understood. Herein, we report an investigation on a λ-MnO2 electrode during the electrochemical lithium recovery process with regards to the Li+ concentration in source water and operation rate of the system. Three distinctive stages of λ-MnO2 originating from different limiting factors for lithium recovery are defined with regard to the rate of Li+ supply from the electrolyte: depleted, transition, and saturated regions. By characterization of λ-MnO2 at different stages using diverse X-ray techniques, the importance of Li+ concentration in the vicinity of the electrode surface is revealed. On the basis of this understanding, increasing the density of the electrode/electrolyte interface is suggested as a realistic and general route to enhance the overall lithium recovery performance and is experimentally corroborated at a wide range of operation environments.

Original languageEnglish
Pages (from-to)9044-9051
Number of pages8
JournalEnvironmental Science and Technology
Volume54
Issue number14
DOIs
StatePublished - 21 Jul 2020

Bibliographical note

Funding Information:
J.Y. would like to acknowledge financial support from Industrial Facilities & Infrastructure Research Program (17IFIP-B065893-05) funded by Ministry of Land, Infrastructure and Transport of Korean government. Y.-E.S. would like to acknowledge that this work was supported by the Institute for Basic Science (IBS) in Republic of Korea (Project Code: IBS-R006-A2).

Publisher Copyright:
Copyright © 2020 American Chemical Society.

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