Lithium phosphate (Li3PO4) is a promising candidate for solid electrolytes. However its ionic conductivity still stands at 3 × 10−7 S/cm which is very low compared to liquid electrolytes which are contained within widely distributed lithium ion batteries at 10−3 S/cm. This requires a solution to increase its conductivity which is the addition of dopants. The proposed dopants are lithium iodide (LiI) and lithium chloride (LiCl) which is mixed with the Li3PO4, creating the new solid electrolyte system Li3PO4(0.5)LiI(0.25)LiCl(0,25). The mixture had an ionic conductivity of 8 × 10−4 S/cm observed through electrochemical impedance spectroscopy (EIS). The crystal structure observation using x-ray diffraction identified the Li3PO4 belongs to the Hermann-Mauguinn symmetrical space group of P m n b.