RESEARCH / A0275
Tandem Topotactic Reactions for Low-Temperature Synthesis of Ni-Rich Layered Oxide Cathodes without Anti-site Defect
Read the original paper · 10.1021/jacs.5c08560 ↗
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 3. Tracking Ni chemical evolution. (a) Schematic diagram of Ni valence changes within NiO6 octahedron during topotactic synthesis. (b) XANES spectra of the hydroxide precursor NCMOH, the oxyhydroxide intermediate NCMOOH, LS-NCM and HS-NCM. (c) sXAS spectra of NCMOH, NCMOOH and LS-NCM. The average valence state of Ni was determined for each spectrum through linear combination fitting (Figure S19) and labeled at the center of the spectrum. (d,e) In-depth XPS analysis of (d) LS-NCM and (e) HS-NCM. (f) Corresponding Ni3+ percentages as a function of etching time of LS-NCM and HS-NCM.