Li9.54Si1.74(P1-xSbx)1.44S11.7Cl0.3: A functionally stable sulfide solid electrolyte in air for solid-state batteries

The air stability of a new family of sulfide solid state electrolytes of Li9.54Si1.74(P1-xSbx)1.44S11.7Cl0.3 (LS(Sb)PS) is reported. The Sb doping further improves the ionic conductivity and cycling stability of the Li9.54Si1.74P1.44S11.7Cl0.3 (LSPS). The air stability of LS(Sb)PS is tested by both material characterization and electrochemical techniques. The structure and electrochemical property of LS(Sb)PS are maintained after 1-hour air exposure in an extreme humidity environment. The lithium metal anode solid-state battery with LiNi0.83Mn0.06Co0.11O2(NMC811) as the cathode and LS(Sb)PS as the electrolyte delivers a high specific capacity and shows a high capacity-retention after cycling.