Caption
Figure 2: The calculated formation energies of AM-GICs (AM = Li, Na) for different alkali metal concentrations (6 ≤ x ≤ 72) and the lowest-energy graphite layer stacking. The black dashed line separates the AM-GICs compounds with the AA- (left-hand side) and AB- (right-hand side) stacking preference of the graphite layers.