Oxidation Stability of Organic Redox Mediators as Mobile Catalysts in Lithium-Oxygen Batteries
- Title
- Oxidation Stability of Organic Redox Mediators as Mobile Catalysts in Lithium-Oxygen Batteries
- Author
- 선양국
- Keywords
- LI-O-2 BATTERIES; ELECTROLYTE; CHEMISTRY; DESIGN; CELLS
- Issue Date
- 2020-06
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS ENERGY LETTERS, v. 5, no. 6, page. 2122-2129
- Abstract
- Employing organic redox mediators (ORMs) for lithium-oxygen (Li-O-2) batteries has emerged as an important strategy to suppress charging overpotentials. Judicious molecular designs of ORMs can also tailor their redox potential and electron-transfer rate to optimize the catalytic efficiency. However, the stability of ORMs in Li-O-2 cells was scarcely studied. Here, the catalytic efficiency and stability of several important ORMs are assessed through in situ gas analysis and reactivity tests with singlet oxygen. Some well-known ORMs are detrimentally decomposed during the first cycle in Li-O-2 cells, whereas nitroxyl-radical-based ORMs bear the most stable and efficient response. Analogous nitroxyl-radical derivatives further increase round-trip energy efficiency and electron-transfer kinetics. This study underlines chemical stability aspects of ORMs, which are mandatory for the long-term cyclability in Li-O-2 cells. We emphasize that besides the importance of ORMs in these systems and their proper selection, an effective operation of Li-O-2 cells depends also strongly on the stability of the carbonaceous cathodes and the electrolyte solutions. The stability of all the components in these systems is inter-related.
- URI
- https://pubs.acs.org/doi/10.1021/acsenergylett.0c00883https://repository.hanyang.ac.kr/handle/20.500.11754/168883
- ISSN
- 2380-8195
- DOI
- 10.1021/acsenergylett.0c00883
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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