Fig. 3: Comparing Li positions and insertion sites.

The relaxed delithiated structure of Ti₂O₄ (a), Mn₃NiO₈ (b), and Ti₂(PS₄)₃ (c). The insertions sites with the three lowest average charge densities are shown in green, yellow, and blue sequentially. The original sites of the removed working ions are indicated with a transparent blue spheres.