We synthesized a novel Al 3+ -doped Na 3 V 1.97 Al 0.03 (PO 4 ) 3 material through a high-temperature solid-phase method using MIL-53(Al) as the Al source. Al 3+ doping in the Na 3 V 2 (PO 4 ) 3 material optimized its crystal structure and enhanced its electronic conductivity and sodiumion diffusion coefficient, resulting in excellent rate performance and cycling stability of the Na 3 V 1.97 Al 0.03 (PO 4 ) 3 cathode.