A Novel Cathodic Combination in Sodium-Ion Battery Based on NaNi0.7Co0.3O2, Na2MnO3, and NaCoO2 Combination: Synthesis and Characterization

Abstract

Several combinations, including (1-x-y) NaNi0.7Co0.3O2, xNa2MnO3, and yNaCoO2 systems, have been prepared by the sol-gel methods. Stoichiometric amounts of the NaNO3, Mn (Ac) 2∙4H2O, Co (Ac)2⋅4H2O, Ni(NO3)2⋅ 6H2O for testing of 28 samples have been applied. We demonstrated that samples, including Na1.5Ni0.117Co0.366Al0.017Mn0.5O2 with Al-doped are the best composition for cathode materials in NIBTs due to the amount of cobalt (Co) in this combination, that is lower compared to NiCoO2. This is important in the viewpoint of expenditure and toxic position of Co usage. Charges and discharges behavior of the cathode materials were analyzed via performing cycle tests in the range of 2.0-4.0V. Our results have shown that these kinds of samples could help to remove the unsuitable disadvantage of Co with high efficiency and also to replace Na that is cheaper instead of Li.