fig8
Figure 8. XPS of NCM90 electrodes after three formation cycles at 0.1C with (A, C, E, G) STD and (B, D, F, H) 0.2% PFP-containing electrolyte: (A, B) C 1s spectra; (C, D) O 1s spectra; (E, F) F 1s spectra; (G, H) N 1s spectra. XPS: X-ray photoelectron spectroscopy; PFP: pentafluoropyridine; STD: standard electrolyte.
