Kim, Hun Kwak, Won-Jin Jung, Hun-Gi Sun, Yang-Kook 2024-01-19T18:01:27Z 2024-01-19T18:01:27Z 2021-09-05 2020-03-21 2050-7488 https://pubs.kist.re.kr/handle/201004/118841 Redox mediators have been studied intensively to improve the energy efficiency and cycle life of lithium-oxygen batteries by facilitating the decomposition of the discharge product (lithium peroxide), thus reducing the side reactions at a high potential during charging. Nevertheless, the cycling performance of lithium-oxygen batteries with redox mediators is unsatisfactory; this problem must be resolved for the successful application of redox mediators. In this study, we confirmed that a redox mediator cannot decompose the by-products on the cathode, leading to the passivation of the cathode surface despite the successful decomposition of lithium peroxide by the redox mediator. By schematizing the routes for by-product formation, we described the processes by which the by-products are accumulated on the cathode in the absence and presence of a redox mediator. Based on the intuitive verification of the unproven relationship between a redox mediator and the by-products, we proposed a complementary strategy to overcome the limitations of the redox mediator and prevent the accumulation of the by-products, which is essential for the improvement of lithium-oxygen batteries. English ROYAL SOC CHEMISTRY LI-O-2 BATTERIES SOLID-ELECTROLYTE CYCLING STABILITY CARBON PERFORMANCE DISCHARGE LIMITATIONS REDUCTION CAPACITY Limited effects of a redox mediator in lithium-oxygen batteries: indecomposable by-products Article 10.1039/c9ta13612f 1 JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.11, pp.5622 - 5628 JOURNAL OF MATERIALS CHEMISTRY A 8 11 5622 5628 scie scopus 000521109000020 2-s2.0-85082527568 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article LI-O-2 BATTERIES SOLID-ELECTROLYTE CYCLING STABILITY CARBON PERFORMANCE DISCHARGE LIMITATIONS REDUCTION CAPACITY