Cycle Degradation Analysis by High Precision Coulometry for Sulfide-Based All-Solid-State Battery Cathode under Various Potentials

All-solid-state batteries (ASSBs) using sulfide-based solid electrolytes (SEs) are promising energy storage devices beyond the present liquid-type lithium-ion (LIBs) organic solvents, which expected to realize adaptation of new systems such as higher-voltage cathodes. However, in recent years, undesirable side reactions being reported nanometer-order region at interface cathode active materials/SEs. Therefore, we evaluated cycle durability all-solid-state half-cells an argyrodite-structured electrolyte various potentials 60 °C and then measured coulombic behavior by high precision coulometry. Furthermore, interfaces material/SE were observed secondary electron microscopy (SEM), transmission spectroscopy (TEM), diffraction (ED). In conclusion, a strong correlation was found between material decomposition interface.