Investigation on the Synthesis, Structure, and Transport Properties of Double-Perovskite-Type Tungsten-Substituted NaLa2TaO6 as a Solid Electrolyte for All-Solid-State-Sodium Batteries

All-solid-state sodium batteries (SSSBs) with improvedenergy density,broad electrochemical windows, and reduced safety issues have beenregarded as propitious energy storage systems to substitute for commercialorganic liquid electrolytes. This study summarizes the electricalproperties of solid-state Na-ion conductors Na1-x La2Ta1-x W x O6 (x =0, 0.01, 0.02, 0.05, and 0.1) possessing a double perovskite-oxide-likestructure. The title compounds were synthesized by a solid-state reactionmethod. The phase identification, structural characterization, andmorphological studies were performed by powder X-ray diffraction (PXRD),Raman spectroscopy, and scanning electron microscopy; in addition,impedance spectroscopy was used to study their sodium-ion (Na+) conductivity. Among the investigated compounds, Na0.99La2Ta0.99W0.01O6 exhibitsa maximized Na+ conductivity of 10(-5) Scm(-1) at 30 & DEG;C. Moreover, Na0.99La2Ta0.99W0.01O6 is chemicallyand electrochemically stable (up to 4.2 V) against the sodium metalanode.

Automated summary

This study summarizes the electrical properties of solid-state Na-ion conductors with a double perovskite-oxide-like structure. The compound Na0.99La2Ta0.99W0.01O6 exhibits the highest Na+ conductivity and shows stability against the sodium metal anode. These findings suggest the potential of these solid-state sodium batteries as a safer and more efficient energy storage system.