We now investigate the synthetic pathway for a different distribution of Li 2 CO 3 particle sizes in order to better understand the impact of Li 2 CO 3 particle size on calcination mechanism and investigate the TGA feature that is inconsistently present in LMR calcination. In the SL-LMR pathway, all mass loss concludes below the Li 2 CO 3 melting point (723°C ). As already noted, this is in contradiction to other literature in which rapid mass loss is observed upon melting of Li 2 CO 3 . To probe this discrepancy, we characterize LMR calcination pathway using as-received Li 2 CO 3 (denoted AR-LMR). See SI Figure .