Modification of NASICON electrolyte in solid sodium-ion batteries—A short review

In recent years, the development and research of electrochemical energy storage systems that can efficiently transform chemical energy into electrical energy with a long service life have become a key area of study. Sodium-ion batteries, leveraging their chemical similarity to lithium-ion batteries, along with their abundant resources and low cost, are seen as a viable alternative to lithium-ion batteries. Additionally, all-solid-state sodium-ion batteries have drawn significant attention due to safety considerations. Among the solid electrolytes for all-solid-state sodium-ion batteries, the NASICON solid-state electrolyte emerges as one of the most promising choices for sodium battery solid electrolytes. However, to date, there has not been a comprehensive review summarizing the existing problems of NASICON electrolyte materials and the corresponding specific modification methods. This review simply summarizes the present issues of NASICON for all-solid-state sodium-ion batteries, such as, the low ionic conductivity, the poor interface stability and compatibility, and the dendrite formation. Then, the corresponding solutions to address these issues are discussed, including the ion doping, the interface modification, the sintering parameters optimization, and the composite electrolytes regulation. Finally, the perspectives of NASICON solid-state electrolyte are discussed.