Sol-gel method for synthesis of Li~+-stabilized Na-β'-alumina for solid electrolytes in sodium-based batteries

摘要

Li~+-stabilized Na-β"-alumina was synthesized through sol-gel based on the Pechini method with Al(NO_3)_3, NaNO_3, and LiNO3 as the metal precursor. Evaluations were done to several different sodium content in order to counterbalance Na2O losses during sintering, as well as different sintering temperature between 1500 - 1700°C. The evaluations were done by density measurement, impedance spectroscopy, X-ray diffraction, and Scanning Electron Microscopy. The synthesized powder exhibits Na-β"-alumina with measured relative density up to 2.96±0.01 g/cm~3. The ionic conductivity achieved was up to 0.23 S/cm at 300°C with lowest activation energy for conduction of 0.17 eV. Moreover, the Na-β"-alumina phase content achieved was up to 84%.