Graphene lithium battery and preparation method thereof

The invention relates to a graphene lithium battery. The graphene lithium battery comprises a lithium metal anode, a cathode and an electrolyte arranged between the lithium metal anode and the cathode, the cathode further comprises a graphene layer, a polymer layer and a catalyst loading the graphene layer, the polymer layer has a hydrophobic outer surface, and the hydrophobic outer surface of the polymer layer is exposed in an ultraviolet/ozone environment in a preparation process of the cathode to convert the hydrophobic outer surface into a hydrophilic surface. According to the graphene lithium battery provided by the invention, a three-dimensional metal substrate is formed by a mask method, and then a step of self-assembling graphene sheets to form three-dimensional framework graphene by adopting a method of coating a polymer and graphene oxide gel; and in addition, according to the graphene lithium battery provided by the invention, a photosensitive polymer is arranged between the substrate and a model w