In ASSBs, the SE, alongside the AMs, plays a critical role by providing chemical stability and an ionic conductivity exceeding several mS.cm -1 at room temperature, which is necessary to match the performance of conventional LIBs. Among a multitude of material classes of solid electrolytes, lithium thiophosphates demonstrate the highest conductivities, some of which exceed 20 mS.cm -1 . Beyond their high conductivity, thiophosphate-based SEs stand out also due to their unique mechanical properties, especially their malleability caused by low Young's moduli, which allows the electrodes to be densified at low temperatures without the need for energy-intensive sintering processes .