Amorphous oxyhalide solid electrolytes with improved ionic conductivity and reductive stability for all-solid-state batteries

Amorphous oxyhalide solid electrolytes, Li 4 x La x Ta 1− x O 2 x Cl 5−2 x , synthesized using LiLaO 2 , demonstrate an impressive conductivity of 4.9 mS cm −1 , along with an exceptionally high critical current density of 40 mA cm −2 in symmetric cells.