Controllable and stable organometallic redox mediators for lithium oxygen batteries

Won Jin Kwak, Atif Mahammed, Hun Kim, Trung Thien Nguyen, Zeev Gross, Doron Aurbach, Yang Kook Sun

Research output: Contribution to journalArticle

Abstract

The use of electrocatalysis in lithium-oxygen batteries is mandatory for reducing the over-potentials of the oxygen evolution reaction (OER), below the levels that endanger the anodic stability of the electrolyte solutions and the carbon electrodes. The most effective catalysts for the OER are solubilized redox mediators that may be oxidized at relatively low potentials, but still capable of oxidizing Li2O2 back to molecular oxygen. Since for the effective and long-term utilization of redox mediators in lithium-oxygen cells a clear evaluation of their stability is essential, we have developed a useful methodology for that purpose. This revealed, quite surprisingly, that most commonly used redox mediators are unstable in lithium-oxygen cells, even under argon atmosphere and without being in contact with Li anodes. Using the abovementioned methodology for evaluating efficiency, we now introduce corrole-chelated metal complexes as stable redox mediators in lithium oxygen batteries. This was achieved by taking advantage of the facile methods for introducing changes in the corrole ligands and by choosing properly the central transition metal cation, two aspects that allow for adjusting the redox properties of the metal complexes for the operative voltage window. We outline further directions and believe that this work will promote optimized selection of redox mediators for lithium-oxygen batteries.

Original languageEnglish
Pages (from-to)214-222
Number of pages9
JournalMaterials Horizons
Volume7
Issue number1
DOIs
StatePublished - 2020 Jan

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Organometallics
Lithium
Oxygen
Coordination Complexes
Metal complexes
Electrocatalysis
Molecular oxygen
Argon
Oxidation-Reduction
Electrolytes
Transition metals
Cations
Anodes
Carbon
Positive ions
Ligands
Electrodes
Catalysts
Electric potential

Cite this

Kwak, W. J., Mahammed, A., Kim, H., Nguyen, T. T., Gross, Z., Aurbach, D., & Sun, Y. K. (2020). Controllable and stable organometallic redox mediators for lithium oxygen batteries. Materials Horizons, 7(1), 214-222. https://doi.org/10.1039/c9mh01043b
Kwak, Won Jin ; Mahammed, Atif ; Kim, Hun ; Nguyen, Trung Thien ; Gross, Zeev ; Aurbach, Doron ; Sun, Yang Kook. / Controllable and stable organometallic redox mediators for lithium oxygen batteries. In: Materials Horizons. 2020 ; Vol. 7, No. 1. pp. 214-222.
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Kwak, WJ, Mahammed, A, Kim, H, Nguyen, TT, Gross, Z, Aurbach, D & Sun, YK 2020, 'Controllable and stable organometallic redox mediators for lithium oxygen batteries', Materials Horizons, vol. 7, no. 1, pp. 214-222. https://doi.org/10.1039/c9mh01043b

Controllable and stable organometallic redox mediators for lithium oxygen batteries. / Kwak, Won Jin; Mahammed, Atif; Kim, Hun; Nguyen, Trung Thien; Gross, Zeev; Aurbach, Doron; Sun, Yang Kook.

In: Materials Horizons, Vol. 7, No. 1, 01.2020, p. 214-222.

Research output: Contribution to journalArticle

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Kwak WJ, Mahammed A, Kim H, Nguyen TT, Gross Z, Aurbach D et al. Controllable and stable organometallic redox mediators for lithium oxygen batteries. Materials Horizons. 2020 Jan;7(1):214-222. https://doi.org/10.1039/c9mh01043b