Interface behavior between garnet-type lithium-conducting solid electrolyte and lithium metal

Al2O3 was doped (0.5, 1.0. and 2.0 wt.%) into the garnet-type lithium ion-conducting solid electrolyte with a nominal composition of Li7La3Zr2O12 (LLZ) by solid state reaction at 1180 °C. The effect of the Al2O3 content in LLZ on the interface behavior with lithium metal was investigated. The lowest interface resistance was observed for 0.5 wt.% Al2O3-doped LLZ, which had the highest relative density of 93.7%. The Li/Al2O3-doped LLZ/Li cell showed a short circuit after a limited polarization period. Short circuiting is considered to be due to lithium dendrite formation. The longest period until short circuit was 1000 s of polarization at 0.5 mA cm− 2 and room temperature for the 0.5 wt.% Al2O3 doped LLZ.