In this study, we expand upon the previous work of Hofmann et al., where the reactivity of different electrolyte compositions on sodium metal was tested extensively. Here, we utilize DFT calculations to better understand the electrolyte decomposition process by calculating the thermodynamic stability of possible fragments and comparing these results to the established experimental data. In the first step, we screened the adsorption energies of hypothesized decomposition products on surfaces likely to exist at the metal-electrolyte interface. A compilation of the considered decomposition products is illustrated in Fig. .