fig6
![Enhanced all-climate sodium-ion batteries performance in a low-defect and Na-enriched Prussian blue analogue cathode by nickel substitution](https://image.oaes.cc/9959e570-1a9a-4e1b-b4b7-6c608b92e083/5397.fig.6.jpg)
Figure 6. First-principles calculations. Electronic density of states of (A) CoHCF and (B) Co0.7Ni0.3HCF at different Na concentrations, including Na-1.5, Na-1, and Na-0.5. (C) The schematic of the calculated Na+ migration paths within the lattice of the Co0.7Ni0.3HCF and CoHCF model structures. (D) Migration energy barriers of the Na+-ion diffusion within the lattice of the Co0.7Ni0.3HCF and CoHCF.