Solution combustion synthesis of NaFePO4 and its electrochemical performance

In the current research work, submicron size single-phase NaFePO4 (NFP) nanoparticles are successfully synthesized using the solution combustion method. The calcination of as synthesized NFP powder is done at 700 °C for 5h in the air atmosphere and it shows the maricite phase crystallized into an orthorhombic structure with a surface area of 9.29 m2/g. The intermolecular vibrations of the (PO4)3− group are identified in the FTIR spectra. The XPS spectra of NFP confirms the presence of Fe and P in +2 and +5 oxidation states, respectively. The coin cell assembled using calcined NFP powder shows a pair of redox peaks at 2.42 and 2.69 V vs. Na/Na+ owing to Na-ion insertion and extraction. NFP material delivers a specific capacity of 28 mAh/g at 0.1 C with 92% capacity retention after 35 cycles.