Fig. 1. Schematic illustrations of the cation reordering and symmetry change upon lithiation/delithiation within different Li_xTM_yO₂ phases.

The 3a, 16c, 16d, and 4a octahedral sites are represented by gray octahedrons, while the 3b octahedral sites and 8a tetrahedral sites are shown as green octahedrons and tetrahedrons, respectively. Transition metal ions, Li ions, and oxygen ions are shown as purple, green, and red balls, respectively, and the probable occupancies of vacancies are marked as green dashed cycles.