Microscopic Insights into Enhancing Mechanical Properties and Ionic Conductivity in Sodium Solid Electrolytes

Solid-state sodium batteries offer a safer and more stable alternative to traditional liquid electrolyte batteries, significantly reducing risks such as leaks and fires. Additionally, sodium's abundance and cost-effectiveness relative to lithium make these batteries a promising option for scalable, sustainable energy storage. Sodium-ion solid electrolytes, particularly sodium zirconium phosphate (NaSICON), are distinguished by their low manufacturing costs, superior ionic conductivity, broad electrochemical windows, and robust chemical and thermal stability, making them outstanding candidates for all-solid-state sodium batteries. However, challenges such as limited mechanical properties and high interfacial resistivity limit their practical application. In this presentation, I will share our recent studies that elucidate the microscopic origins of these limitations and explore potential microstructural enhancements. A comparison of different ceramic solid electrolytes will also be provided.