The LMR material evolves crystallographically both during and after the conclusion of lithiation. During lithiation, a lattice parameter contraction (Figure and) is consistent with Mn oxidation, followed by thermal expansion after the conclusion of oxidation. The c/a ratio of the final, layered phase (Figure and) stays above the theoretical cubic value of 4.9 throughout lithiation, again supporting that the lithiated material exhibits layered ordering throughout calcination. The increase in this parameter following lithiation indicates an increase in the extent of this layered ordering. During the high-temperature hold (Figure , g, and h), the decrease in c/a ratio and convergence of Li