Tailoring Lattice Oxygen Redox and Robust Structure Stability in High‐Entropy Superlattice Layered Cathode for Superior Potassium‐Ion Storage
Tailoring Lattice Oxygen Redox and Robust Structure Stability in High‐Entropy Superlattice Layered Cathode for Superior Potassium‐Ion Storage
研究概述
研究内容请参见论文原文。
谱图与表征信息
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.