FAST IONIC CONDUCTOR FOR SODIUM-ION BATTERIES

Abstract

Sodium-ion batteries are viewed as the next generation of batteries to replace current lithium-ion batteries because of the abundance of sodium, their low price, and their safety. One of the most critical components of sodium-ion batteries is the solid-state electrolyte, which should have superior operational safety and design simplicity, yet provide reasonable room-temperature ionic conductivity. Solid electrolyte further simplifies battery cell design since it often offers acceptable mechanical performance and eliminates the requirement for extra containment or separator components during battery assembly. Ceramic electrolytes based on phosphate are a good option for all-solid-state Na-ion cells. By doping and structural tuning, the NASICON (Na Super Ionic Conductor) structured electrolytes can be adapted to the necessary qualities. Metal oxide MO6-octahedra, which are coupled to PO4-tetrahedra, respectively, make up the NASICON framework. The Na-ions are moving along the c-axis, from occupied to unoccupied lattice sites, in this three-dimensional structure.