fig7

Figure 7. SEM images of (A, D) fresh NCM90 electrode and those cycled in (B, E) STD and (C, F) 0.2% PFP-containing electrolyte after 200 cycles at 1C between 3.0 and 4.3 V at 30 °C. [Magnification: (A-C) 10000×; (D-F) 20000×]. SEM: Scanning electron microscopy; STD: standard electrolyte; PFP: pentafluoropyridine.