RESEARCH / A0252
Tailoring Cathode Interphase Chemistry for High‐Voltage Li‐ion Batteries
Read the original paper · 10.1002/anie.202518546 ↗
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 4. Characterizations of LCO cathode and CEI. Top-view and cross-sectional SEM images of LCO cathode after 100 cycles between 3.0 and 4.55 V using a,b) BE and c,d) NFA-assisted electrolytes. HAADF-STEM images of LCO cathode after 100 cycles between 3.0 and 4.55 V using e) BE and f) NFA-assisted electrolytes. The surface region marked by orange and blue dashed square in (e,f) has been FFT-filtered and shown in insets, and the corresponding atomic model has been drawn in insets. g) Normalized XANES spectra of Co of cycled LCO using different electrolytes. Wavelet transform images of the EXAFS spectra of LCO after 100 cycles using h) BE and i) NFA-assisted electrolytes. The color mapping from blue to red represents the magnitude of the wavelet coefficient from low to high. j) XPS C 1s, N 1s, O 1s, and F 1s spectra for LCO cathode after 100 cycles between 3.0 and 4.55 V using different electrolytes.