Sodium ion batteries (NIBs) are promising candidates for large-scale energy storage system applications. However, NIBs with organic liquid electrolytes suffer from the risk of flammability, leakage, and volatilization. All-solid-state NIBs with Na-ion-conducting solid electrolytes can prevent these safety issues mentioned above.
In this work, β"-alumina-based ceramic materials have been synthesized as electrolytes for all-solid-state NIBs. The β"-alumina-based ceramic materials were synthesized by using high temperature solid state reaction methods. The ionic conductivities of solid-state β"-alumina-based ceramic electrolytes were optimized by varying the concentration of precursors and additives, as well as the calcination and annealing temperatures. The calcination temperature affected the morphology and crystallinity of β"-alumina-based ceramic materials thus influenced the electrical properties. The morphology and structure of the β"-alumina-based ceramic electrolytes were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD), respectively. The electrical properties of theβ" -alumina-based ceramic electrolytes were measured by using electrochemical impedance spectroscopy (EIS) and chronoamperometry measurement system in order to demonstrate its potential for all-solid-state NIB applications.