Lowering lithium content and finding less critical compositions in SEs, along with optimized composite route preparation, is crucial for SSBs to effectively replace lithium-ion batteries (LIBs). Although considered safer, the increased safety of SSBs needs unequivocal proof, as there are potential safety risks associated with short circuits, toxic SEs, and percolation of the liquid electrolytes to the anode. Note that binaries are simple compounds that can be used as coating materials to prohibit elecrolyte degradation. In particular halides have been identified as suitable coating materials due to their favorable electrochemical stability together with exhibiting a suitable ionic mobility. Ternary materials such as inorganic oxides, hydrides, and chalcogenides display commendable bulk ionic conductivities. Among these, chalcogenide spinel lattices have been recognized as ionic conductors with high ion mobility,