A volume of 64 µm × 64 µm × 24 µm of NMC powder has been systematically analysed,i.e. 3200 particles. Selected regions of interest inside the reconstructed volume displaying several NMC particles are shown in Figure . While many of the particles appear single crystal in nature (Fig. ), a significant fraction of polycrystalline material is also detected (Fig. ). The morphology of these particles is complex, and they appear to be 'welded' into porous aggregates, or have a faceted structure but with apparent porosity. The quantity of highly defective particles which exhibit inner pores, or an aggregated / welded structure, represents 17% of the total number of NMC particles imaged. The presence of these aggregates is evidence that the larger single crystals are formed through coalescence of smaller crystallites.