Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. Powder XRD patterns of as-synthesized P2-NaNM and P2-NaNMT samples.
  • fig. S2. In situ XRD patterns of P2-NaNM and P2-NaNMT powders at different temperatures.
  • fig. S3. SEM images of P2-NaNM and P2-NaNMT sample.
  • fig. S4. TEM and HRTEM images of P2-NaNMT sample.
  • fig. S5. Cycling performance comparison of P2-NaNM and P2-NaNMT
    electrodes at 0.1 C in the voltage range of 2.5 to 4.15 V during 100 cycles.
  • fig. S6. SEM images of P2-NaNM and P2-NaNMT electrodes after long cycles.
  • fig. S7. Charge/discharge profiles of P2-NaNM and P2-NaNMT electrodes between 2.5 and 4.3 V.
  • fig. S8. Cycling performance comparison of P2-NaNM and P2-NaNMT electrodes at 0.1 C in the voltage range of 2.5 to 4.3 V during 100 cycles.
  • fig. S9. CVs of P2-NaNM and P2-NaNMT electrodes.
  • fig. S10. XPS spectra of P2-NaNM and P2-NaNMT powders.
  • fig. S11. Variation of lattice constants and unit cell volume during cycling.
  • fig. S12. Schematic illustration for P2-O2 phase transition.
  • fig. S13. In situ XRD patterns of P2-NaNM and P2-NaNMT electrodes between 2.5 and 4.3 V.
  • fig. S14. GITT curves and the quasi-equilibrium potential as a function of the stoichiometry.
  • fig. S15. Calculated Na chemical diffusion coefficients from GITT.
  • fig. S16. OCV decay of P2-NaNM and P2-NaNMT electrodes.
  • fig. S17. Nyquist plots of EIS and the fit for P2-NaNM and P2-NaNMT electrodes.
  • fig. S18. MSD curves for each kind of ions in P2-Na0.58NMT.
  • table S1. Crystallographic parameters of P2-NaNM refined by the Rietveld method.
  • table S2. Crystallographic parameters of P2-NaNMT refined by the Rietveld method.
  • table S3. Atomic distances, slab thickness, and d-spacing of the Na layer and interslab distance for as-prepared materials.
  • table S4. Summary of Na+ diffusion coefficients and activation energies in layered oxides.

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