Ionic Conductivity and Microstructure of Li₄GeO₄-Based Solid Electrolytes

Abstract

Li 4 GeO 4 -based solid electrolytes can be synthesized at low temperatures, and their formability is improved by adding Li 2 SO 4 . Glass ceramic Li 4 GeO 4 exhibits a relatively high ionic conductivity of approximately 10 ¹6 S cm ¹1 at room temperature, which is higher than that of glass Li 4 GeO 4 . Thus, Li 4 GeO 4 has promising applications in all-solid-state lithium ion batteries. To understand the correlation between the ionic conductivity, formability, and microstructure of the synthesized materials, the microstructures and crystallization process of glass and glassceramic Li 4 GeO 4 and 80Li 4 GeO 4 •20Li 2 SO 4 (Li 3.6 Ge 0.8 S 0.2 O 4 ) were observed by transmission electron microscopy (TEM). Since Li 3.6 Ge 0.8 S 0.2 O 4 glass exhibits a halo diffraction pattern, the addition of Li 2 SO 4 to Li 4 GeO 4 stabilizes its amorphous phase. In addition, glass ceramic samples were found to be characterized by an amorphous state containing nanocrystallites with a crystallinity degree of approximately 40%, which improves the ionic conductivity of the material.

Mechanism Exploration of Li2S–Li2O–LiI Positive Electrodes with High Capacity and Long Cycle Life via TEM Observation

“…Scattering intensity profiles extracted from ED patterns can be used to identify the precipitated crystalline phase by comparing the intensity profile and XRD patterns. Image Pro software was used to extract the crystal size distribution from HCDF images to investigate the effects of crystal size on cell performance. , …”

“…Image Pro software was used to extract the crystal size distribution from HCDF images to investigate the effects of crystal size on cell performance. 25,26 Pair Distribution Function (PDF) Analysis. PDF analysis is a powerful method used in materials science to characterize the atomic or molecular structure of a material.…”