Park, Jin-Bum Lee, Seon Hwa Jung, Hun-Gi Aurbach, Doron Sun, Yang-Kook 2024-01-19T23:33:21Z 2024-01-19T23:33:21Z 2021-09-03 2018-01-04 0935-9648 https://pubs.kist.re.kr/handle/201004/121817 Li-O-2 batteries have received much attention due to their extremely large theoretical energy density. However, the high overpotentials required for charging Li-O-2 batteries lower their energy efficiency and degrade the electrolytes and carbon electrodes. This problem is one of the main obstacles in developing practical Li-O-2 batteries. To solve this problem, it is important to facilitate the oxidation of Li2O2 upon charging by using effective electrocatalysis. Using solid catalysts is not too effective for oxidizing the electronically isolating Li-peroxide layers. In turn, for soluble catalysts, red-ox mediators (RMs) are homogeneously dissolved in the electrolyte solutions and can effectively oxidize all of the Li2O2 precipitated during discharge. RMs can decompose solid Li2O2 species no matter their size, morphology, or thickness and thus dramatically increase energy efficiency. However, some negative side effects, such as the shuttle reactions of RMs and deterioration of the Li-metal occur. Therefore, it is necessary to study the activity and stability of RMs in Li-O-2 batteries in detail. Herein, recent studies related to redox mediators are reviewed and the mechanisms of redox reactions are illustrated. The development opportunities of RMs for this important battery technology are discussed and future directions are suggested. English WILEY-V C H VERLAG GMBH LITHIUM-OXYGEN BATTERY REDUCED GRAPHENE OXIDE LI-AIR BATTERIES LI2O2 OXIDATION ELECTROLYTE CATHODE ELECTROCATALYSTS EVOLUTION SOLVENTS BEHAVIOR Redox Mediators for Li-O-2 Batteries: Status and Perspectives Article 10.1002/adma.201704162 1 ADVANCED MATERIALS, v.30, no.1 ADVANCED MATERIALS 30 1 scie scopus 000419033700019 2-s2.0-85035147565 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Review LITHIUM-OXYGEN BATTERY REDUCED GRAPHENE OXIDE LI-AIR BATTERIES LI2O2 OXIDATION ELECTROLYTE CATHODE ELECTROCATALYSTS EVOLUTION SOLVENTS BEHAVIOR additives electrolytes lithium-oxygen batteries redox mediators soluble catalysts