Controlling the Ionic and Electronic Transport at the All-solid-state Battery Interfaces

Abstract

All-solid-state Li batteries attract considerable attention as a next-generation energy storage device due to their higher energy density and safety than conventional Li-ion batteries with a liquid electrolyte. To further improve battery performance, it is crucial to reduce the large resistance at the interfaces in the batteries. Here, we discuss the fundamental understanding of interface resistances from surface science and semiconductor physics. We reveal that the atomic arrangement of electrode-electrolyte interfaces plays a key role in reducing interface resistance. In addition, we evaluate the interface resistance between electrodes and current collectors. We stress that fundamental understandings based on surface and interfacial physics are critical for developing all-solid-state Li batteries.