Novel Approach for Enhancing Ionic Conductivity of Na Superionic Conductor-Type Li_1.3Al_0.3Ti_1.7(PO₄)₃ Solid Electrolyte Prepared Using Hydrothermal Method

In this study, the hydrothermal synthesis technique was employed to successfully fabricate Li_1.2Al_0.2Ti_1.7(PO₄)₂ (LATP), a solid electrolyte renowned for its outstanding electrochemical properties. The research aimed to identify optimal synthesis conditions for LATP, achieving material with exceptional ionic conductivity and high purity. The optimal conditions included sintering the material with an additional 15% lithium hydroxide at 850 °C, which significantly enhanced the ionic conductivity to 3.01 × 10^-4 S cm^-1. This approach also resulted in a notable purity enhancement, exceeding 92%, and increased sample density by 36% compared to samples sintered without protective powder. The use of lithium hydroxide as a protective powder during sintering was crucial in curbing impurity formation, minimizing lithium loss, and enhancing overall densification. These findings underscore the potential of LATP solid electrolytes synthesized under these conditions for advanced energy storage technologies.