A NASICON-type (Na ion super conductor) structured Li1.3Al0.3Ti1.7(PO4)(3) (LAW) solid electrolyte with high lithium ion conductivity was synthesized using a simple solution method with 85% H3PO4 solution. In comparison with conventional solid-state reaction and sol-gel method, the pure LATP powders and dense LATP pellets were obtained at a relatively lower temperature. The LATP powders and the resultant pellets were characterized by X-ray diffraction, scanning electron microscopy (SEM) and AC impedance spectroscopy. The LATP pellet obtained at 800 degrees C for 12 h shows the highest total conductivity of 1.21 x 10(-3) S cm(-1) at room temperature and the lowest activation energy of 0.26 eV. These results imply that the LAW electrolytes obtained using this method can be considered as candidates for solid state electrolytes. (C) 2016 Elsevier B.V. All rights reserved.