Mg0.5Ti2(PO4)3 having NASICON-lattice was prepared by sol–gel method and evaluated as a cathode material for magnesium cells. The crystalline phase could be successfully obtained after heating at 600°C. Electrochemical magnesium insertion from a propylene carbonate solution into this host was found possible and one Mg2+ ion could be accommodated per unit formula. However, the magnesium insertion process was under kinetic control of Mg2+ diffusion due to the low mobility of Mg2+ in this host.