Synthesis and characterization of a new perovskite-type solid-state electrolyte of Na1/3La1/3Sr1/3ZrO3 for all-solid-state sodium-ion batteries

Abstract

Abstract All-solid-state batteries have shown excellent safety property, making them promising candidates for large scale energy storage applications. Solid-state electrolyte (SSE) with high ionic conductivity and chemical stability is crucial for practical application of all-solid-state batteries. Herein, a cubic perovskite-type SSE with an optimal composition of Na1/3La1/3Sr1/3ZrO3 has been synthesized by a conventional solid-state reaction, which was investigated by XRD, SEM and electrochemical impedance spectroscopy. Na1/3La1/3Sr1/3ZrO3 (NLSZO) shows a high Na-ion conductivity of 1.025\u202f×\u202f10−5\u202fS\u202fcm−1 at 25\u202f°C. The effects of composition and sintering temperature on the lattice parameter, relative density and Na-ion conductivity of SSE have been explored in detail. The increase of Sr doping amount in NLSZO and sintering temperature leads to an augment of lattice parameter and densification of SSE, which contributed to an enhanced ionic conductivity.