To further verify the depletion of indium in the electrolyte after the recycling process, ICP-MS analysis was conducted on all Li3InCl6 electrolyte samples. These measurements assessed their detailed chemical compositions and identify potential cross-contamination from recycling with different electrode materials (see Table -S7). All measurements were normalized to lithium (or chlorine), revealing deviations in the molar ratios of ions after recycling (see Table ). A noticeable increase in lithium content in the recrystallized fraction was observed, likely due to ion exchange processes, such as Li + /H + exchange between the electrode material and H2O. Li + ions from the electrode materials dissolve in H2O 16, and likely co-precipitate along with Li3InCl6 during recrystallization.