The intercalation of alkali metals in graphene monolayers and bilayers has been studied using first-principles calculations in particular density functional theory. Alkali metals intercalate into graphite, leading to the formation of M-graphene layered materials (with M = Li, Na, K, Rb, and Cs). Intercalated species can modify the very electronic structure of graphene and consequently its electron mobility. Thanks to various experimental studies, it has been

possible to demonstrate that alkali metal intercalation can be used to modify the electronic structure close to the Fermi level of the M-graphene materials and manipulate the carrier mobility and therefore we want to do this also with computational studies. These materials have a wide variety of applications, especially for the development of new batteries and other devices. The first principles are discussed on the effects of the intercalation of a heavy-alkali metal (K) on the electronic structure of graphene monolayers and bilayers.