fig6

Figure 6. TEM images of (A) fresh NCM90 and the NCM90 cycled in the (B) STD and (C) 0.2% PFP-containing electrolytes after three formation cycles at 0.1C between 3.0 and 4.3 V at 30 °C. TEM: Transmission electron microscopy; STD: standard electrolyte; PFP: pentafluoropyridine.