NaFePO4 is a material known as maricite that is expected to function as a battery cathode, showing the properties of an analogue with LiFePO4 which has been commercialized for a long time. The as-synthesized NaFePO4 samples were calcined under argon atmosphere for 10 hours with the varying temperature. The successfully synthesized NaFePO4 was identified by XRD and SEM/EDX characterisations. The XRD result showed the formation of NaFePO4 phase accompanied by the appearance of a secondary phase. Confirmation of phase formation was carried out using XRD and EDX measurements with all elements (Na, Fe, P, O). The sample's morphology shows agglomerated particles with non-uniform particles size. The formation of the NaFePO4 phase with somewhat high purity indicates the appropriate process of Na-ion battery cathode using the sol-gel method.