Fig. 4
From: Lattice doping regulated interfacial reactions in cathode for enhanced cycling stability
Secondary and primary particle morphological and structural evolution upon cycling. a, b SEM images of NC and NCA from cross-sectional view, showing the secondary particle pulverization after 100 cycles. c, d Phase transition on NC and NCA surfaces. The white dashed lines outline the contour of surface reconstruction layers. The d3 and d4 represent the thickness of disordered rock salt (Fm\(\bar 3\)m) layers and cation mixing layers in NC and NCA group, respectively. Scale bar, 4 μm (a, b), 2 nm (c, d)
