fig2

Figure 2. SEM images of the pristine NCM particles and NCM/AC/GN composites. (A and B) pristine NCM523 particles; (C and D) NCM523/AC/GN composites; (E and F) pristine NCM811 particles; (G and H): NCM811/AC/GN composites; (I and J) pristine NCM9055 particles; (K and L) NCM9055/AC/GN composites. SEM: Scanning electron microscopy; NCM: lithium nickel cobalt manganese oxide; AC: activated carbon; GN: graphene.