reported the partial substitution of lithium (Li) sites with Al 3+ /B 3+ in Li 6 PS 5 X (X = Cl and Br), and Li 5.4 Al 0.2 PS 5 Br exhibited an increased ionic conductivity of 2.4 × 10 -3 S cm -1 at RT . In another study, tellurium (Te) doping in Li 6.25 PTe 0.125 S 5.125 Cl 0.75 resulted in a relatively high ionic conductivity of 4.5 × 10 -3 S cm -1 at RT . Additionally, various aliovalent substitutions have been explored to enhance ionic conductivity .