State-by-state, atom-by-atom projected density of states (PDOS) analysis was carried out for the surface structures of all CMO compositions. PDOS analysis offers a chemically intuitive description of the DFT charge density, and is used here to quantify the filling of specific orbitals for the transition metals in material, which are then used to assign the oxidation states of the metal sites in the model surfaces. In general, the oxidation states of the metals in the pristine surfaces (prior to the introduction of defects) are consistent across all formulations, with Co and Al always being 3 + , Ti and Mn being 4 + and Ni always being 2 + . Fe and V are the only metals with varied oxidation states from 2 + to 3 + . The band gap (E gap ) was tabulated from the electronic band structure for the bulk and surface, with the surfaces having smaller values of E gap , relative to bulk counterparts. The largest variation in E gap was found in NMC, with a difference of 0.8012 eV and the smallest was FTA and FTV with a 0.03 eV difference. We find that the values of E gap for surfaces are not drastically different from those of the bulk solid solutions.