Abstract
Cubic Ga-doped Li7La3Zr2O12 (LLZO) tubes with one closed end were produced by a 3D printing-reactive sintering process. For the first time, the structural stability of Ga-doped LLZO tubes (relative density: ∼88 %, cubic LLZO fraction > 90 %) was evaluated after immersion in eutectic PbLi, a candidate molten breeder, at 350 and 450 °C. The high ionic conductivity cubic LLZO phase was maintained after immersion at 350 °C for 100 h, while secondary phase formation and conversion of cubic LLZO to the tetragonal polymorph was observed after 6 h at 450 °C. Li was successfully pumped through the tubes during linear voltage sweeps at 350 °C, indicating that Ga-doped LLZO is a possible candidate for hydrogen isotope extraction in PbLi via direct electrolysis.
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