Synthesis of Ga-doped Li7La3Zr2O12 solid electrolyte with high Li+ ion conductivity

Garnet-type Li7La3Zr2O12 (LLZO) Li+ ion solid electrolyte is a promising candidate for next generation high-safety solid-state batteries. Ga-doped LLZO exhibits excellent Li+ ion conductivity, higher than 1 x 10(-3) S cm(-1). In this research, the doping amount of Ga, the calcination temperature of Ga-LLZO primary powders, the sintering conditions and the evolution of grains are explored to demonstrate the optimum parameters to obtain a highly conductive ceramics reproducibly via conventional solid-state reaction methods under ambient air sintering atmosphere. Cubic LLZO phase is obtained for Li6.4Ga0.2La3Zr2O12 powder calcined at low temperature 850 degrees C. In addition, ceramic pellets sintered at 1100 degrees C for 320 min using this powder have relative densities higher than 94% and conductivities higher than 1.2 x 10(-3) S cm(-1) at 25 degrees C.

Automated summary

The study found that by using Li6.4Ga0.2La3Zr2O12 powder calcined at 850 degrees Celsius, a cubic LLZO phase can be obtained, and ceramic pellets sintered at 1100 degrees Celsius for 320 minutes using this powder have relative densities higher than 94%, with conductivities higher than 1.2 x 10(-3) S cm(-1) at 25 degrees Celsius.