Among the single halide argyrodites, Li 6 PS 5 Cl exhibits the highest ionic conductivity at ambient temperature, approximately 10 -3 S cm -1 , followed by Li 6 PS 5 Br with around 10 -4 S cm -1 , while Li 6 PS 5 I displays the lowest ionic conductivity, approximately 10 -6 S cm -1 , as illustrated in Fig. ). The origin of such high ionic conductivity in Li 6 PS 5 Cl and Li 6 PS 5 Br has been the focus of several investigations. It has been observed that disorder involving S 2-/X -site occupancy plays a significant role, resulting in ionic conductivity that is three orders of magnitude lower in fully ordered Li 6 PS 5 I. However, some studies argue that an increase in Li-ion concentration and Li-site disorder is the primary contributing factor .