The invention provides a cathode current collector, a battery positive electrode pole piece, and a lithium ion battery. The cathode current collector comprises a graphene composite aluminum foil material layer, wherein the graphene composite aluminum foil material layer comprises: an aluminum foil substrate; a planar graphene layer, located in parallel on the aluminum foil substrate; and a vertical graphene layer, vertically located on the planar graphene layer. The invention utilizes a graphene composite aluminum foil with a vertical graphene layer as a cathode current collector of a lithiumion battery for enhancing the peel strength of the positive electrode pole piece of the lithium ion battery. Compared with the common aluminum foil current collector, the peel strength of the electrode material is greatly improved, which is advantageous for improving the yield of the electrode pole piece manufacturing process and the cycle stability of the lithium ion battery.