Finally, we evaluate the chemical compatibility of sulfide and oxide anolytes with the fluoride catholytes listed in Table . Figures and show the heatmaps for their reac-tion enthalpies. It can be observed that Li 3 PS 4 (among the sulfides) and Li 3 PO 4 (among the oxides) show the mildest reactivity, i.e., the best chemical compatibility, with the fluoride catholytes. The sulfide and oxide anolytes show the least reactivity with LiYF 4 and Li 3 AlF 6 . In contrast, the oxide anolytes appear most reactive with Li 3 InF 6 . The reaction products are shown as pie charts in Figure -S7 of the SI. We note that, for the fluoride catholytes, the ∆H and the reaction products do not change significantly upon applying the second thermodynamic correction to the DFT results. Thus, this second correction is ignored. We find that bilayer interfaces with Li 3 PS 4 , LGPS, Li 3 PO 4 as anolytes and LiYF 4 , Li 3 AlF 6 as catholytes have positive ∆H. Thus, these six interfaces are predicted to be chemically compatible.