▎ 摘　　要

The intercalation process of Li underneath a graphene layer grown on a Cu foil has been studied by means of synchrotron radiation photoemission spectroscopy and X-ray photoelectron spectroscopy. The deposition of Li on the graphene surface at room temperature results in a charge transfer from the adsorbed Li atoms to graphene. After annealing the as-deposited Li/graphene/Cu sample at 300 degrees C for 10 min, the Li atoms intercalate into the interface of graphene/Cu. These interfacial Li atoms show strong passivation from the oxidation environment due to the protection by the gaphene layer on top.