期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 36, 页码 12553-12557出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201907477
关键词
donor number; Li-O-2 battery; reaction mechanism; soluble catalyst; vanadium(III) acetylacetonate
资金
- Liaoning Revitalization Talents Program-Pan Deng Scholars [XLYC1802005]
- Liaoning BaiQianWan Talents Program, National Science Fund of Liaoning Province for Excellent Young Scholars, Science and Technology Innovative Talents Support Program of Shenyang [RC180166]
- Australian Research Council (ARC) [DE150101306, LP160100927]
- Faculty of Science Strategic Investment Funding 2019 of University of Newcastle
- CSIRO Energy
- Robert A. Welch Foundation [F-1841]
- Texas Advanced Computing Center
High donor number (DN) solvents in Li-O-2 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-O-2 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 O-2 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.
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