Abstract
In this part, a comparative kinetic study for several RMs for OER by investigating the RM-assisted charging focusing on the chemical decomposition rate of discharge product and the RM diffusivity in the controlled lithium–oxygen cells. It was revealed that the overall RM kinetics have a positive correlation with the RM redox potential, and, the RM with multi-redox capability can display kinetic properties depending on its oxidation states. Among the investigated RMs, DMPZ2+ (5,10-dihydro-5,10-dimethylphenazine) exhibits the highest lithium peroxide decomposition rate, while TEMPO+ (2,2,6,6-tetramethyl-1-piperidinyloxy) shows the highest mass diffusion rate. Furthermore, the selection of electrolytes is observed to greatly influence the rate capability of the RM-assisted charge, and thereby be carefully considered.
The essence of this chapter has been published in Journal of Materials Chemistry A. Reproduced with permission from [Ko, Y. et al., J. Mater. Chem. A, 2019, 7, 6491–6498] Copyright (2019) Royal Society of Chemistry.
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Ko, Y. (2021). Investigation on the Kinetic Property of Redox Mediators. In: Development of Redox Mediators for High-Energy-Density and High-Efficiency Lithium-Oxygen Batteries. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-16-2532-9_3
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DOI: https://doi.org/10.1007/978-981-16-2532-9_3
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