Structure and ionic conductivity of cubic Li sub(7)La sub(3)Zr sub(2)O sub(12) solid electrolyte prepared by chemical co-precipitation method

Solid electrolyte Li sub(7)La sub(3)Zr sub(2)O sub(12) (LLZO) powder was successfully synthesized by co-precipitation method. The LLZO powder calcined at 850 degree C with a tetragonal phase was confirmed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) showed that the particles sizes of LLZO precursor powder were in the range of 0.5 ~ 1 mu m. LLZO pellets were sintered at different temperatures from 1150 to 1200 degree C in air atmosphere. When the temperature was above 1150 degree C, tetragonal LLZO would completely transform into cubic phase. The total ionic conductivity of LLZO pellet sintered at 1180 degree C was 2.0 10 super(- 4) S cm super(- 1) at 30 degree C, and the activation energy was 0.25 eV. This result indicates that high quality LLZO solid electrolytes can be obtained by chemical co-precipitation method.