Production of Mg modified Na0.67(Mn0.5Fe0.5)1-xCoxO2 (x=0.05-0.3) cathode materials and investigation of battery performances

In this thesis, firstly, the changes in the structural properties of Na0.67(Mn0.5Fe0.5)1-xCoxO2 (x=0.05-0.3) cathode material by Co doping were investigated. Then, electrochemically inactive Mg doping was made and the effect of sodium ions on the deterioration of the crystal structure during the movement of sodium ions was investigated. Structural properties of the produced samples were carried out with XRD, SEM, FTIR, and Raman analyses. Mg+2 doping in the structure was performed at a rate of 0.1- 0.3 - 0.5%. The structural properties of the doped and undoped Mg+2 Na0.67(Mn0.5Fe0.5)1-x CoxO2 produced cathodsamples were investigated by X-ray diffraction analysis (XRD), FTIR spectroscopy, scanning electron microscope (SEM) analysis. By using the obtained cathode active materials, CR2032 button type batteries were produced. Electrochemical, cyclic voltammetry (CV), battery charge/discharge characteristics at different current densities and EIS (Electrochemical impedance spectroscopy) performance analyzes of the produced CR2032 button-type batteries were performed. As a conclusion, it was found that low Mg doping in the structure increases battery performance.