Effects of Mg Doping on Electrical Performance of LiNi0.8Mn0.1Co0.1O2 Cathode Materials

The electrical and structural performance of LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC 811) is analyzed with the doping of magnesium using a solution combustion synthesis (SCS) procedure with precursors LiNO 3 , Ni(NO) 3 .6H 2 O, Mn(NO 3 ) 2 .4H 2 O, and Co(NO 3 ) 2 .6H 2 O. The doping was done with stoichiometric calculation for the addition of MgCl 2 .6H 2 O. The reactants were dissolved in still water and stirred using a hot plate magnetic stirrer at room temperature. After fully dissolved, the solution is heated at 185 o C for 2-3 hours for the solution combustion to occur. After the product was obtained, the NMC 811 powder was calcined at 800 o C for 4 hours to obtain a fine powder. The synthesized powder morphology was analyzed through scanning electron microscopy (SEM) with an obtained surface area of 4.3 μm. X-ray Diffraction (XRD) was further employed to identify the crystal structure of the powder showing changes in microstructure in the presence of lithium nickel oxide (LNO) as a contaminant. To measure the resistance and determine how it affected the cathode's electrical conductivity, electrical impedance spectroscopy (EIS) was utilized. The outcomes demonstrated that adding a certain quantity of magnesium might improve the NMC 811's electrical conductivity. An investigation using cyclic voltammetry (CV) revealed multiple oxidation-reduction peaks as a sign of contamination.