Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) measurements were performed using a Zeiss EVO 15 device equipped with an integrated EDX system to study the morphology and composition of the pristine as-synthesized and recycled materials. Powder samples were fixed on an SEM sample holder using carbon tape and sputtered with gold. The sputtering was conducted inside an Ar-filled glovebox, to avoid oxidation and hydration of the air-sensitive solid electrolyte. Particle size distribution was analyzed using ImageJ software. A total of 100 individual particles were measured to obtain statistically representative size distribution data.