Fig. 2: Visualization and quantification of the lithium-ion diffusion front propagation within an NMC particle.
From: Asynchronous domain dynamics and equilibration in layered oxide battery cathode

a Images of a typical NMC particle acquired using an optical microscope during the first charge. b Sequential differential maps reveal the sub-particle active regions with high local current. c Normalized intensity evolution of several randomly selected pixels in the particle (colored) and that averaged over the entire particle (black). d The evolution of the current flow over the entire particle. Figures (a) and (b) share the scale bar which is 10 μm.