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https://hdl.handle.net/2440/121205
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Type: | Journal article |
Title: | Vanadium(III) acetylacetonate as an efficient soluble catalyst for lithium-oxygen batteries |
Author: | Zhao, Q. Katyal, N. Seymour, I.D. Henkelman, G. Ma, T. |
Citation: | Angewandte Chemie International Edition, 2019; 58(36):12553-12557 |
Publisher: | Wiley |
Issue Date: | 2019 |
ISSN: | 1433-7851 1521-3773 |
Statement of Responsibility: | Qin Zhao, Naman Katyal, Ieuan D. Seymour, Graeme Henkelman, and Tianyi Ma |
Abstract: | High donor number (DN) solvents in Li-O₂ batteries that dissolve superoxide intermediates in lithium peroxide (Li₂O₂) formation facilitate high capacities at high rates and avoid early cell death. However, their beneficial characteristics also result in an instability towards highly reactive superoxide intermediates. Furthermore, Li-O₂ batteries would deliver a superior energy density, but the multiphase electrochemical reactions are difficult to achieve when operating with only solid catalysts. Herein we demonstrate that vanadium(III) acetylacetonate (V(acac)₃) is an efficient soluble catalyst that can address these problems. During discharge, V(acac)₃ integrates with the superoxide intermediate, accelerating O₂ reduction kinetics and reducing side reactions. During charge, V(acac)₃ acts as a redox mediator that permits efficient oxidation of Li₂O₂. The cells with V(acac)₃ exhibit low overpotential, high rate performance, and considerable cycle stability. |
Keywords: | Donor number; Li-O₂ battery; reaction mechanism;·soluble catalyst; vanadium(III) acetylacetonate |
Rights: | © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/anie.201907477 |
Grant ID: | http://purl.org/au-research/grants/arc/DE150101306 http://purl.org/au-research/grants/arc/LP160100927 |
Published version: | http://dx.doi.org/10.1002/anie.201907477 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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