Figure 7.

a) Enlarged views of a region of interest at different states of charge, where lithiation occurs on one side only (outside to inside). The progression of lithium into the Li_xMnO₂ is observed by the strain front propagating through the material during discharge, as seen in the regions highlighted by the gray boxes. The evolution of this process can be seen in Movie S5 (Supporting Information). b) Averaged strain in the vertical direction of the boxed regions of interest showing the evolution of strain across the Li_xMnO₂ layer during one‐sided lithiation. The blue arrows indicate the direction of measurement.