Effect of Ga-Bi Co-doped on Structural and Ionic Conductivity of Li7La3Zr2O12 Solid Electrolytes Derived from Sol–Gel Method
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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.
Keywordssolid state electrolyte co-doped ionic conductivity sol–gel
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This work was supported by the National Nature Science Foundation of China (NSFC Nos. 51672130 and 51572123), the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and astronautics) (Grant No. MCMS-0518K01), the special fund of 333 high-level talents training project in Jiangsu province (BRA2017424), the Key Research and Development Program of Jiangsu Province (Grant No. BE2018008-2), the Innovation Fund, Nanjing University of Aeronautics and Astronautics (2018CX00147) and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).