RESEARCH / A0304
Tailoring Lattice Oxygen Redox and Robust Structure Stability in High‐Entropy Superlattice Layered Cathode for Superior Potassium‐Ion Storage
Read the original paper · 10.1002/anie.202513581 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 1. Structural aspect of KMNCFCL0.1 solid solution. a) Rietveld refined XRD pattern of KMNCFCL0.1 with inset of K─O─Li configuration. b) Structure schematic showing the short-range ordering superlattice structure and the P3 stacking sequence of the MO2 layers. HAADF-STEM images along the c) [010] and d) [001] projections of KMNCFCL0.1. e) SAED pattern recorded along the c-zone axis. f) HRTEM micrograph with inset of line profiles. g) STEM-EDS mapping images. h) XANES spectra at the Mn K-edge. i) Calculated pDOS of Mn 3d in KMO and KMNCFCL0.1.
Figure 4. Charge compensation mechanisms in the high-entropy KMNCFCL0.1 system. a) Normalized Co, Mn, and Cu K-edge XANES spectra collected at different states of charge. WT-EXAFS spectra of b) Mn and c) Cu K-edge in various charge states. d) FT-EXAFS spectra of Mn K-edge in different charge states. e) Schematic view of the coordination environment around one Mn atom. f) Fitted K-edge FT-EXAFS spectra at 4.2 V in the case of Cu. The inset is the corresponding fitted EXAFS, shown in k3 weighted k-space. g) Bond length and h) Debye–Waller factor σ 2 of TM–O interaction, collected from the fitted FT-EXAFS data.