Influence of sintering atmosphere on the phase, microstructure, and lithium-ion conductivity of the Al-doped Li7La3Zr2O12 solid electrolyte

Al-doped Li7La3Zr2O12 (Al-LLZO) solid electrolytes were sintered at 1150.C for 8 h in atmosphere of oxygen, argon and air (named as Al-LLZO-O-2, Al-LLZO-Ar and Al-LLZO-Air, respectively). All the Al-LLZO samples exhibited a single cubic garnet-type structure. The sample of Al-LLZO-O-2 possessed the highest relative density (95.60%) and the largest average grain size among the three Al-LLZO samples. Furthermore, owing to its high relative density and small number of grain boundaries, Al-LLZO-O-2 demonstrated a higher lithium-ion conductivity than Al-LLZO-Ar and Al-LLZO-Air.

Automated summary

Al-LLZO-O-2 sample with the highest relative density and largest grain size demonstrates higher lithium-ion conductivity.