Solid state ionics for the development of artificial intelligence components

Solid state ionics is a field that elucidates and applies the phenomena of ion transport in solids, in contrast to electronics which elucidates and applies the phenomena to electron transport. In recent years, unique functional solid state ionics devices have been developed for information and communication equipment, using not only solid electrolyte but also mixed conductors that transport ions and electrons in solids, and the fused field of solid state ionics devices and electronics devices is gaining importance. Herein we provide an overview of solid state ionics and various solid state ionics devices that have been developed to date, with emphasis on recently introduced solid state ionics devices made of solid electrolytes and mixed conductors. Such devices are expected to be indispensable for the future development of information and communication equipment, especially in relation to artificial intelligence, where electronic devices have been predominant.