Abstract
Li4GeO4-based solid electrolytes can be synthesized at low temperatures, and their formability is improved by adding Li2SO4. Glass–ceramic Li4GeO4 exhibits a relatively high ionic conductivity of approximately 10−6 S cm−1 at room temperature, which is higher than that of glass Li4GeO4. Thus, Li4GeO4 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 glass–ceramic Li4GeO4 and 80Li4GeO4·20Li2SO4 (Li3.6Ge0.8S0.2O4) were observed by transmission electron microscopy (TEM). Since Li3.6Ge0.8S0.2O4 glass exhibits a halo diffraction pattern, the addition of Li2SO4 to Li4GeO4 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.
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