Fig. 7: HAADF-STEM/EELS analysis of cycled NMC622 cathodes.

a Pristine NMC622 and cycled NMC622 cathodes with different electrolytes, b Gen 2 electrolyte after 100 cycles, c (PMpyrf)0.8Li0.2FSI electrolyte after 100 cycles, and d (PMpyrf)0.5Li0.5FSI electrolyte after 300 cycles. (i–ii) HAADF-STEM images, (iii) BF-STEM images, and (iv) EELS line scan from primary particle surface to bulk of cathode.