Design of the sodium ionic conductor for all-solid-state battery

The high ionic conductivity of solid electrolyte plays a key role in the performance of all-solid-state batteries. Therefore, the crystal structure is very important in the design of solid ionic conductor. Recently, various solid electrolytes for all-solid-state lithium-ion batteries, especially lithium thiophosphate system, have been reported. These materials generally exhibit high ionic conductivity and can be obtained by easy preparation methods. Kandagal et al. theoretically predicted a new sodium-ion conductor having same crystal structure of lithium thiophosphates [1]. To date, however, it has been not experimentally demonstrated. In the present study, we synthesize a new sodium-ion conductor using a mechanochemical technique and subsequent optimized thermal treatments. The details of the crystal structural analysis and characterization of the AC impedance will be discussed.


[1] Kandagal et al. J. Mater. Chem. A 3, 12292 (2015).