Theoretical formulation of Na3AO4X (A = S/Se, X = F/Cl) as high-performance solid electrolytes for all-solid-state sodium batteries

It is very important and yet extremely challenging to develop solid state electrolytes to make sodium ion batteries (SIBs) safer, since the much larger size of Na⁺ than that of Li⁺ makes transport of Na⁺ rather difficult.