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A Self‐Supported λ‐MnO2 Film Electrode used for Electrochemical Lithium Recovery from Brines

A Self‐Supported λ‐MnO2 Film Electrode used for Electrochemical Lithium Recovery from Brines Lithium recovery from an aqueous resource was accelerated by electrochemically driving the transformation of MnIV/MnIII with a spinel λ‐MnO2 film electrode. A λ‐MnO2 electrode without binders or conductive additives is preferred for achieving a large capacity at high current density and long‐term cycling capability. In this study, a film of Mn(OH)2 was first deposited on the surface of Pt or graphite substrates owing to alkalization near the cathode, then it was oxidized to a Mn3O4 film by air, followed by being hydrothermally lithiated to LiMn2O4 spinel and, finally, it was turned into the λ‐MnO2 film electrode through potentiostatic delithiation. The results show that the charging/discharging electric capacity of the fabricated λ‐MnO2 film electrode was up to ≈100 mAh g−1 at a current density of 50 mA g−1 in 30 mm Li+ aqueous solution, twice that of the λ‐MnO2 powder electrode. Also, 82.3 % lithium capacity remained after 100 cycles of an electrochemically assisted lithium recovery process, indicating high availability and good stability of the λ‐MnO2 spinel on the electrode. The energy consumption for each cycle is estimated to be approximately 1.55±0.09 J, implying that only 4.14 Wh is required for recovery of one mole of lithium ions by this method. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png ChemPlusChem Wiley

A Self‐Supported λ‐MnO2 Film Electrode used for Electrochemical Lithium Recovery from Brines

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References (46)

Publisher
Wiley
Copyright
© 2018 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
2192-6506
eISSN
2192-6506
DOI
10.1002/cplu.201800185
Publisher site
See Article on Publisher Site

Abstract

Lithium recovery from an aqueous resource was accelerated by electrochemically driving the transformation of MnIV/MnIII with a spinel λ‐MnO2 film electrode. A λ‐MnO2 electrode without binders or conductive additives is preferred for achieving a large capacity at high current density and long‐term cycling capability. In this study, a film of Mn(OH)2 was first deposited on the surface of Pt or graphite substrates owing to alkalization near the cathode, then it was oxidized to a Mn3O4 film by air, followed by being hydrothermally lithiated to LiMn2O4 spinel and, finally, it was turned into the λ‐MnO2 film electrode through potentiostatic delithiation. The results show that the charging/discharging electric capacity of the fabricated λ‐MnO2 film electrode was up to ≈100 mAh g−1 at a current density of 50 mA g−1 in 30 mm Li+ aqueous solution, twice that of the λ‐MnO2 powder electrode. Also, 82.3 % lithium capacity remained after 100 cycles of an electrochemically assisted lithium recovery process, indicating high availability and good stability of the λ‐MnO2 spinel on the electrode. The energy consumption for each cycle is estimated to be approximately 1.55±0.09 J, implying that only 4.14 Wh is required for recovery of one mole of lithium ions by this method.

Journal

ChemPlusChemWiley

Published: Jan 1, 2018

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