Journal
ACS CATALYSIS
Volume 9, Issue 11, Pages 9914-9922Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b01337
Keywords
lithium oxygen batteries; redox mediator; singlet oxygen; singlet oxygen quencher
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Funding
- Human Resources Development program of a Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Ministry of Trade, Industry and Energy of the Korean government [20184010201720]
- European Research Council (ERC) [636069]
- KAIST
- European Research Council (ERC) [636069] Funding Source: European Research Council (ERC)
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Li-O-2 batteries are plagued by side reactions that cause poor rechargeability and efficiency. These reactions were recently revealed to be predominantly caused by singlet oxygen, which can be neutralized by chemical traps or physical quenchers. However, traps are irreversibly consumed and thus only active for a limited time, and so far identified quenchers lack oxidative stability to be suitable for typically required recharge potentials. Thus, reducing the charge potential within the stability limit of the quencher and/or finding more stable quenchers is required. Here, we show that dimethylphenazine as a redox mediator decreases the charge potential well within the stability limit of the quencher 1,4-diazabicyclo[2.2.2]octane. The quencher can thus mitigate the parasitic reactions without being oxidatively decomposed. At the same time the quencher protects the redox mediator from singlet oxygen attack. The mutual conservation of the redox mediator and the quencher is rational for stable and effective Li-O-2 batteries.
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