Yingling Liao

3.2. Electron Microscopy Analysis Scanning electron microscopy (SEM) combined with energy-dispersive spectroscopy (EDS) mapping was carried out to explore the morphology and elemental distribution of Zn-substituted and unsubstituted materials, as shown in Figure 4 .

Optimisation of a P3 phase with superior high voltage reversibility Activation of oxygen anion redox represents an effective method of increasing the specific capacity as well as raising the operating voltage of layered sodium transition metal oxides. However, these reactions are often accompanied by irreversible structural transformations and detrimental side‑reactions between the electrolyte and electrode interface which accelerate degradation, thereby impeding their practical application.