Kwak, Won-Jin Freunberger, Stefan A. Kim, Hun Park, Jiwon Trung Thien Nguyen Jung, Hun-Gi Byon, Hye Ryung Sun, Yang-Kook 2024-01-19T19:01:11Z 2024-01-19T19:01:11Z 2021-09-05 2019-11 2155-5435 https://pubs.kist.re.kr/handle/201004/119388 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. English AMER CHEMICAL SOC LI-O-2 BATTERIES SUPEROXIDE ANION SOLID-ELECTROLYTE STABILITY RECHARGEABILITY DISMUTATION LIMITATIONS GENERATION DISCHARGE CELLS Mutual Conservation of Redox Mediator and Singlet Oxygen Quencher in Lithium-Oxygen Batteries Article 10.1021/acscatal.9b01337 1 ACS CATALYSIS, v.9, no.11, pp.9914 - 9922 ACS CATALYSIS 9 11 9914 9922 scie scopus 000494549700023 2-s2.0-85073251069 Chemistry, Physical Chemistry Article LI-O-2 BATTERIES SUPEROXIDE ANION SOLID-ELECTROLYTE STABILITY RECHARGEABILITY DISMUTATION LIMITATIONS GENERATION DISCHARGE CELLS lithium oxygen batteries redox mediator singlet oxygen singlet oxygen quencher