Recent advances in charge mechanism of noble metal-based cathodes for Li-O2 batteries

Lithium-oxygen (Li-O 2 ) batteries are considered as the next generation for energy storages systems due to the higher theoretical energy density than that of Li-ion batteries. However, the high charge over -potential caused by the insulated Li2O2 results in low energy efficiency, side reaction from electrolyte and cathode, and therefore poor battery performance. Designing noble metal-based catalysts can be an effective strategy to develop high-performance Li-O 2 batteries with low charge overpotentials and out-standing cycle stability. However, the charge mechanism for noble metal-based catalysts is not clear and even contradictory. Herein, several charge mechanisms of Li2O2 are first discussed. Subsequently, the pos-sible charge processes of Li-O 2 batteries with noble metal-based catalysts are illustrated. In addition, the future development for noble metal-based catalysts is outlined.(c) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.