2B-2
Time-Resolved Structural Analysis of Sulfide Electrolyte Degradation using XRD, PDF, and PCA, H. Uchiyam (Shimane Univ.) et al.

All-solid-state batteries are promising next-generation energy storage systems due to their high energy density and enhanced safety. However, their practical application is hindered by limited long-term stability, particularly the degradation of sulfide solid electrolytes accompanied by toxic gas generation under ambient conditions. In this study, the degradation behavior of Li₃PS₄ glass and glass-ceramic electrolytes under air exposure was systematically investigated using operando high-energy X-ray diffraction at SPring-8. By combining time-resolved diffraction measurements with pair distribution function (PDF) analysis and principal component analysis (PCA), the structural evolution during degradation was quantitatively characterized.