Effects of storage humidity on the crystal structure and on the sheet properties of the lithium borosilicate glass for solid electrolyte

Abstract

Solid electrolytes for secondary batteries offer advantages over liquid ones, enhancing application range and scalability. While oxide-based solid electrolytes are actively researched for all-solid-state batteries, studies on the atmospheric stability of lithium borosilicate (LBS) glass are limited. Notably, LBS glass green sheets show significant changes in mechanical properties under varying humidity. This study investigates the aging of LBS glass materials, both as powder and green sheets, in controlled humid environments. Analysis using thermal gravimetric analysis-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) revealed that moisture evaporation and crystal formation occur over time. Both forms reacted with atmospheric H₂O, forming new crystal structures, especially under high humidity. In conclusion, LBS glass undergoes structural and chemical changes due to humidity and time, highlighting the importance of considering environmental conditions in practical applications.