The lithium-garnet electrolyte, nominally Li₇La₃Zr₂O₇ (LLZO), has attracted considerable attention as an electrolyte material for safer next-generation solid-state lithium batteries owing to its combination of high ionic conductivity (up to 10^-3 S/cm at room temperature, depending on dopants), apparent stability against metallic lithium, and wide electrochemical stability window. While LLZO’s properties are appealing, it is a difficult material to process with scalable techniques, e.g. tape casting, particularly because of the challenge of sintering LLZO ceramics to high density while controlling Li content. This talk will describe the development of a scalable process for producing thin LLZO sheets including the selection of a tape casting system and the optimization of sintering conditions and additives.