Structure and ionic conductivity of cubic Li7La3Zr2O12 solid electrolyte prepared by chemical co-precipitation method

• Published in: Solid state ionics Vol. 287; pp. 13 - 16
• Main Authors: Shao, Chongyang, Liu, Hanxing, Yu, Zhiyong, Zheng, Zhenning, Sun, Nian, Diao, Chunli
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2016
• Subjects: co-precipitation; ionic conductivity; Li7La3Zr2O12; phase transformation; co-precipitation; ionic conductivity; phase transformation; Li7La3Zr2O12
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2016.01.042

Solid electrolyte Li7La3Zr2O12 (LLZO) powder was successfully synthesized by co-precipitation method. The LLZO powder calcined at 850°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 0.5~1μm. LLZO pellets were sintered at different temperatures from 1150 to 1200°C in air atmosphere. When the temperature was above 1150°C, tetragonal LLZO would completely transform into cubic phase. The total ionic conductivity of LLZO pellet sintered at 1180°C was 2.0×10−4Scm−1 at 30°C, and the activation energy was 0.25eV. This result indicates that high quality LLZO solid electrolytes can be obtained by chemical co-precipitation method. •Cubic Li7La3Zr2O12 electrolyte was synthesized by Chemical co-precipitation method.•Tetragonal LLZO transformed into cubic LLZO when the temperature was above 1150°C.•The particle size of LLZO precursor powder was in the range of 0.5~1μm.•The total ionic conductivity of sample sintered at 1180°C was 2.0×10−4Scm−1 at 30°C.•The activation energy was 0.25eV.