Li7La3Zr2O12 (LLZO) has proven to be a feasible material for use in all-solid-state battery electrolytes with adequate stability and ionic conductivity at room temperature. New applications such as liquid metal-based batteries and nuclear fusion utilize high-temperature processes have accelerated the development of lithium-ion ceramic conductors with improved functionality in these temperature regimes. For this application, solid electrolyte candidates must be stable at high temperatures (~600 ║C) while in contact with molten Li and Li alloys, and have negligible electrical conductivity but high ionic conductivity (> 0.1 S/cm at 450 ║C). Electrode synthesis methods developed in this work consist of 3D printing followed by reactive furnace sintering of LLZO-based tubes with sizes that can be utilized in both the engineering-scale fusion demonstrations. Optimized compositions including dopant incorporation, processing, and properties such as the melt solution calorimetry determined enthalpy of formation, high temperature conductivity and long-term stability measurements will be discussed.