The size distribution of the particle's equivalent diameter ranges from 100 nm up to 9.5 µm, with a median size of 1.9 µm, i.e. half of the powder volume is composed of the particles with an equivalent diameter smaller than this. Previous reports suggest that single crystals with a size between 1 and 4 µm are sufficiently small to preserve (dis)charge rate capability in NMC. The largest particles ( ≤ 5 µm) represent more than 10% v , which is non negligi- ble, and likely degrades the rate capability of the total active material. In addition, substantial volumes of large particles can have detrimental effects on the homogeneity of the electrode slurry deposition process, and electrode cohesion during cycling. These parameters should therefore be carefully controlled during crystal growth. Shape is an important microstructural parameter, since it controls both the surface area to volume ratio, and often the crystallographic facets exposed on the particle surface, which are directly related to intercalation kinetics and degradation phenomena. The sphericity factor S, is the volume ratio of an inscribed sphere, which fits entirely within a particle, to the circumscribing sphere which encompasses the complete particle (Fig. ). Given their respective radii, r ins and r cir , sphericity is defined as: