Based on the alternate crenels structure of sodium layer and transition metal layer in layered transition metal oxides, it is proposed to construct transition metal components with weak hybridization with oxygen orbitals by doping ions with slightly larger radius and different Fermi energy levels in the transition metal layer for removing iron by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC. It promotes the transfer of more charge on sodium atoms to oxygen, forming stronger Na-O binding, and then inhibits the loss of sodium in active lattice and the embedding of heterogeneous molecules, significantly improving its air stability.
Based on this idea, two typical O3 materials (NaFe0.5Co0.5O2(NaFC) and NaNi0.5Mn0.5O2(NaNM)) were modified by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC. Mg2+(radius)/Ti4+(Fermi level) was used to replace Fe3+ in NaFC, and NaFe0.3Co0.5Mg0.1Ti0.1O2(NaFCMT) was obtained. Substituting Mn4+ in NaNM with Ti4+(radius consideration and Fermi level consideration) gives NaNi0.5Mn0.25Ti0.25O2(NaNMT).
Through the fitting analysis of the results of XPS of oxygen element, it was found that the surface residual alkali content of NaFC and NaNM samples increased significantly after exposure to air, while the change of NaFCMT and NaNMT was not obvious. The depth analysis of TOF-SIMS of aging samples showed that the Na− and NaCO3- signals were more evenly distributed in NaFCMT and NaNMT samples modified by PTMS LITHIUM COBALT ACID MATERIAL MAGNETIC. The results showed that the modified sample effectively inhibited the spontaneous removal of active sodium and the formation of residual alkali.
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