LITI2 (PO4) 3 BASED COMPOUNDS WITH NASICON TYPE STRUCTURES ARE KNOWN AS LOW TEMPERATURE SOLID ELECTROLYTES WITH FAST LI+ION TRANSPORT. SUBSTITUTION OF TI4+→M3++LI+ IN THE SYSTEM LI1+X MXTI2−X (PO4) 3 (WHERE M=FE, SC, AL, Y, B, IN, GA) LEADS TO HIGHER CONDUCTIVITIES BY SEVERAL ORDERS HIGHER THAN THOSE OF HOST COMPOUNDS. LI1.3AL0.3TI1.7 (PO4)3 (LATP) IS ONE OF THE MOST HIGHLY CONDUCTIVE, AIR STABLE, LITHIUM CERAMIC ELECTROLYTES THAT HAVE BEEN USED IN LI-AIR BATTERIES RECENTLY AS SOLID ELECTROLYRE INTERFACE. THE SIGNIFICANT ADVANTAGE OF CERAMIC BASED ARTIFICIAL SEI IN LI AIR BATTERIES IS THAT IT PROTECTS THE LITHIUM METAL FROM ALL ATMOSPHERIC CONTAMINATION. MOST STUDIES ON LATP HAVE ADOPTED SOLID STATE REACTION AND MELTING–QUENCHING METHODS FOR THE LATP PREPARATION. THESE METHODS CANNOT BE EASILY APPLIED TO THE MASS PRODUCTION DUE TO HIGH ENERGY CONSUMPTION AND CONTAMINATION OF IMPURITIES IN THE FINAL PRODUCTS. ON THE OTHER HAND SOLUTION BASED SYNTHESIS METHOD FAVORS THE PREPARATION OF POWDER WITH CONTROLLED COMPOSITION AND METALLURGY. IN THIS STUDY WE HAVE PREPARED LATP POWDERS BY A SOLUTION BASED SYNTHESIS METHOD CONTINUED BY SINTERING TO OBTAIN THE HIGHEST IONIC CONDUCTIVITY.50 ML OF NH4OH AND 25 ML OF TI (OC3H8) 4 WAS USED AS PRECURSOR PRODUCING A WHITE GELATINOUS PRECIPITATE. THE PRECIPITATE WAS WASHED WITH 500 ML OF DEIONIZED WATER TO REMOVE THE EXCESS BASE AND PLACED IN 100 ML OF DEIONIZED WATER. TO THIS SOLUTION WAS ADDED 200 ML OF A 1 M SOLUTION OF ANHYDROUS OXALIC ACID. AL (NO3) 3·9H2O, (NH4) 2HPO4, AND 5% EXCESS LINO3 WERE ADDED UNDER STIRRING WITH STOICHIOMETRIC RATIOS TO THE SOLUTION. THE FINAL SOLUTION WAS THEN HEATED ON A HOT PLATE UNTIL ALL THE WATER WAS EVAPORATED, WHICH PRODUCES A WHITE PRECIPITATE OF WELL MIXED PRECURSORS FOR ANNEALING.