- Title
- Vanadium(III) acetylacetonate as an efficient soluble catalyst for lithium-oxygen batteries
- Creator
- Zhao, Qin; Katyal, Naman; Seymour, Ieuan D.; Henkelman, Graeme; Ma, Tianyi
- Relation
- ARC.DE150101306 http://purl.org/au-research/grants/arc/DE150101306
- Relation
- Angewandte Chemie Vol. 58, Issue 36, p. 12553-12557
- Publisher Link
- http://dx.doi.org/10.1002/anie.201907477
- Publisher
- Wiley - V C H Verlag GmbH
- Resource Type
- journal article
- Date
- 2019
- Description
- 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.
- Subject
- donor number; Li-O₂ battery; reaction mechanism; soluable catalyst; vanadium(III) acetylacetonate
- Identifier
- http://hdl.handle.net/1959.13/1416821
- Identifier
- uon:37126
- Identifier
- ISSN:1433-7851
- Rights
- This is the peer reviewed version of above article, which has been published in final form at https://doi.org/10.1002/anie.201907477. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
- Language
- eng
- Full Text
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