Dendrite-free, interfacially compatible Na 2 ZrCl 6 composite halide solid-state electrolyte for solid-state sodium-ion batteries

The Na 2 ZrCl 6 –PAN composite solid electrolyte achieves an excellent ionic conductivity of 1.21 × 10 −4 S cm −1 at 30 °C a wide electrochemical window of 4.37 V, and exhibits favorable interfacial stability when contact with Na metal and Na 3 V 2 (PO 4 ) 3 .