  We present first-principles calculations on systems consisting of a few
layers of graphene and lithium. In particular, we investigate the evolution of
the electron-phonon coupling strength with increasing number of layers. We find
that, for intercalated systems such as C6-Li-C6 or C6-Li-C6-Li-C6, the
electron-phonon coupling is weak. However, for systems of equal number of
graphene and lithium layers, such as C6-Li or C6-Li-C6-Li, the electron-phonon
coupling is strong. We investigate the optimal configuration that yields the
highest superconducting transition temperature.
