Development of vanadium-doped cathode materials for sodium-ion batteries and investigation of battery performance

In this thesis, Na0.67 Mn0.5-x Vx Fe0.43 M0.07 O2 (M=Al,Ti) (x: 0.1, 0.2, 0.3, 0.4, 0.5) was synthesized by a modified solid state method by doping vanadium into the cathode material. XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy), FTIR (Fourier Transform Infrared Spectroscopy), BET (Surface Area and Pore Size) and RAMAN analyses were performed to investigate the characteristics of the produced material. CR2032 battery cells were produced using cathode active materials prepared with stoichiometric ratios. Electrochemical, i.e. CV (cyclic voltimetry), EIS (electrochemical impedance spectroscopy) and charge/discharge cycling properties of the produced CR2032 button-type batteries were examined by applying different current ratios at different temperature environments and battery performance analyzes were performed. It was found that low vanadium doping improves the battery performance.