Enhanced total ionic conductivity of NASICON-type solid-state electrolyte Li1+xAlxTi2−x(PO4)3

The LATP solid electrolyte is the most promising material for high Li-ion and electronic conductivity compared to other fast ionic conductors. Herein, we intend to develop a three-dimensional Li1+xAlxTi2−x(PO4)3 solid electrolyte to facilitate the migration of lithium ions from substituting Al3+ for Ti4+ through a simple, effective sol–gel technique. Thermal treatment over ceramic pellet at 1123 K resembles the NASICON-type Rhombohedral structure by X-ray and Raman analysis. A study of dielectric relaxation and ionic behaviour of conducting materials was carried out due to their potential application in electronic devices. Analogous to the ion conduction mechanism, pelletised LATP was achieved with excellent ionic conductivity σ = 1.919 × 10−4 S/cm at room temperature. Similarly, the temperature-dependent ion conduction mechanism was carried out at various temperatures, and the activation energy was determined to be 0.10 eV. In addition, the LiCoO2/LATP/AC device is constructed by sandwiching the composite electrolyte LATP between activated carbon (AC) and LiCoO2. Such a solid-state device achieved a remarkable energy density of 2.10 Wh/kg and a power density of 141.17 W/kg. This exhibits enhanced rate capability and cycling performance of 93% over 10,000 cycles. This analysis may provide a promising strategy for designing high-performance energy storage systems.