Effect of sintering temperature on sol–gel synthesized NASICON-type Li_1.3Al_0.3Ti_1.7(PO₄)₃ ceramic solid electrolyte

NASICON (Sodium (Na⁺) Super-Ionic CONductor) type structured Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) solid electrolyte with high lithium-ion conductivity was synthesized by sol–gel method. The structural, microstructural, and ionic conductivity studies were carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), and AC impedance spectroscopy, respectively. Infrared (IR) spectra have been studied to know the structural groups present in ceramic samples. The LATP sample sintered at 1000 °C for 1 h with a relative density of 95.52% exhibits the highest ionic conductivity of 0.9023 mS cm⁻¹ at 25 °C and lowest activation energy of 0.171 eV. The highest conductivity of this sample is mainly attributed to high density resulting in the good sintering capability of the studied ceramic electrolyte material.