Probing Distinctive Redox Mechanism in Ni‐Rich Cathode Via Real‐Time Quick X‐Ray Absorption Spectroscopy

Abstract

Figure 5. The Fourier transformed Co K-edge EXAFS spectra of LNC during a) the first charge and b) the first discharge by conventional step mode XAS, and c) the first charge and d) the first discharge by QXAS.

Elevating Operation Voltage and Suppressing Phase Transition for Honeycomb‐Layered Cathodes by a Dual‐Honeycomb Structure Strategy

“…The normalized K‐edge X‐ray absorption near‐edge structure (XANES) spectra of Ni in Te−0.8 during the first cycle process at the states of the pristine, charged to 3.7 V, charged to 4.3 V, discharged to 2.4 V, and discharged to 2.0 V, are shown in Figure 6a. According to previous research, [ 41,42 ] the weak absorption peak A for 1 s → 3 d quadrupole‐allowed transition appears at about 8333 eV with Ni 3 d −4 p orbital mixing by the structural distortion of NiO 6 octahedra. Two strong absorption peaks for the 1 s → 4 p dipole‐allowed transitions with and without shakedown process of ligand to metal charge transfer (LMCT) are observed at about 8342 eV (peak B) and 8351 eV (peak C), respectively.…”