The process of high-throughput screening for +1 valence electrides in this work is shown in Figure . Our screening starts from the Materials Project database which includes more than 140,000 inorganic compounds and uses the Vienna ab initio Simulation Package (VASP) to calculate them. As the definition of electrides requires an excess electron, in the first step, we identify the materials with the total valence as +1, such as 𝐶𝑎 2 𝑁. This is accomplished by mapping the most common oxidation states for each element, identified in a previous study, to chemical formulae in the database and summing the component values. In total this screening provides 3,804 candidates.