Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39341-39346Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c09688
Keywords
Li-CO2 battery; redox mediator; singlet oxygen; energy storage; isotope labeling
Funding
- National Natural Science Foundation of China [51773092, 22008117, 21975124]
- Opening Project of State Key Laboratory of High-Performance Ceramics and Superfine Microstructure [SKL201911SIC]
- Natural Science Project by Higher Education Institutions of Jiangsu Province [20KJB530009]
- Research Foundation of State Key Lab [ZK201717]
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Rechargeable Li-CO2 batteries directly using CO2 as the reactant have the potential for deeper energy storage penetration and CO2 utilization, but face challenges. The addition of a redox mediator phenoxathiin has been found to reduce over-potential during charging and provide insights into the reaction mechanism of the Li-CO2 battery.
Rechargeable Li-CO2 batteries as a novel system developed in recent years directly use CO2 as the reactant, which enables deeper penetration of energy storage and CO2 utilization. The Li-CO2 battery system, however, is at an early stage, and many challenges remained to be overcome urgently, especially the problem of high over-potential during the charging process. Here, we report a redox mediator, phenoxathiin, to assist the decomposition of Li2CO3 during the charging process, which effectively reduces the over-potential and improves the cycling performance of the battery. Furthermore, we detect the presence of singlet oxygen during the oxidation of Li2CO3 by phenoxathiin, which reveals more of the underlying science of the reaction mechanism of the Li-CO2 battery.
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