Abstract
Herein, we conducted IEC 62660-1 cycle, high-temperature cycle, and high-temperature storage tests on sulfide-based all-solid-state batteries to evaluate their durability and degradation mechanism. On the basis of the high-temperature cycle test and cell analysis, the increase in the resistance of the batteries was attributed to the oxidation of the sulfide electrolyte at the positive electrode. Moreover, the decrease in the capacity caused by the consumption of active Li+ was attributed to the reduction of the sulfide electrolyte at the negative electrode. We also considered that the degradation mechanisms follow the Arrhenius law on the basis of the high-temperature storage tests.
