Abstract
High performance Al-doped Li7La3Zr2O12 (LLZO) solid electrolytes were successfully prepared by plasma activated sintering method. The effect of Al2O3 concentration on the microstructure and ionic conductivity of Li7La3Zr2O12 was investigated. Without addition of Al2O3, only tetragonal phase was obtained at temperature range of 1000-1200 °C. Pure cubic phase of LLZO was obtained with the addition of 1.2-1.8 wt.% Al2O3. The pellet sintered at 1150 °C with 1.5 wt.% content of Al2O3 had a maximum relative density of 99.8 % with total ionic conductivity of 5.7×10−4 S/cm at room temperature. Al2O3 can stabilize the cubic LLZO phase which promotes the transformation of LLZO from tetragonal to cubic phase.
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