8 1 I H I G H L I G H T S 2 0 2 2
LiDFP, but the significance varies as indicated by the different length of the red arrows. It can be observed that the LiDFP-induced suppression of both the SOC variation
and the anisotropic polarisation is more pronounced in the particles with smaller volume and with higher sphericity, as shown in Figure 70d.
Fig. 70: a) Three-dimensional rendering of the composite electrode from the cell with baseline electrolyte. b) Particle volume and sphericity are extracted and compared in both conditions. c) The anisotropic polarisation
behaviour of all particles is plotted as a function of their corresponding SOC variation. d) The centroids of the contour lines are plotted for different particle groups with and without the LiDFP additive.
Fig. 71: a) X-ray nanotomography cross-section results of NMC particles
after 200 cycles between 2.8~4.8 V using additive-containing electrolyte
(lower) and baseline electrolyte (upper). b) The relative frequency of
the porosity values of all extracted particles in both conditions. The
suppression of particles with severe damage in the electrode with
additive-containing electrolyte is indicated by an arrow in inset. c) Pie
charts showing the percentages of particles at different porosity levels.