Enhanced Cathode Reactions of the Solid-State Li-Air Battery By Operating Under Humidified Atmosphere

摘要

Lithium-air (Li-air) battery has been considered to be a promising next-generation energy storage system owing to its high theoretical specific energy of 3,458 Wh/kg. Despite the progresses that have been made to improve the cell performance and reaction kinetics of Li-air battery, achieving its sustained reversibility still remains as a highly challenging goal because of the use of liquid electrolyte and carbonaceous materials in the cathode. These components could easily decompose by side reactions against highly oxidative radicals during cycling, leading to a poor cycle life of the cell. To address this instability issue, stable all-solid-state cathode has attracted research attention in accordance with the recent development of oxide-based solid electrolytes. Although a few meaningful approaches to demonstrate oxide-based solid-state cathodes have been reported, such cells were operated under pure oxygen atmosphere (Li-O_2 battery), resulting in limited active interfaces for oxygen redox reactions and low specific capacity to the total weight of the cathode structure.