Effect of Ga-Bi Co-doped on Structural and Ionic Conductivity of Li7La3Zr2O12 Solid Electrolytes Derived from Sol–Gel Method

• DOI: 10.1007/s11664-019-07607-7
• Publication Date: 2019-09-10T18:04:47Z
• Authors: Jun Li; Kongjun Zhu; Xin Zhang; Tuo Wang; Xia Li; Jing Wang; Kang Yan; Jinsong Liu
• Keywords: Fast ion conductor; Relative density

In the present study, Li6.5−3xGaxLa3Zr1.5Bi0.5O12 (0 ≤ x ≤ 0.3) ceramics were obtained by the sol–gel method. Then, the influences of Ga contents on the crystal structure, micromorphology, and ionic conductivity of the above ceramics were systematically studied by X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. Our results show that all samples appear to be in cubic phase. Suitably doping Ga contents (x = 0.1) promoted the densification of ceramics with relative density of 93.5% and improved ionic conductivity of 1.7 × 10−4 S cm−1. This finding on improved ionic conductivity can be attributed to the enhanced densification and occupation of the octahedral 96 h site.