▎ 摘　　要

NOVELTY - Preparation of three-dimensional graphene comprises mixing water-soluble polymer solution with transition metal salt solution, adding pore-forming agent solution, and mixing; and drying, crushing, and carbonizing. USE - The method is used for preparation of three-dimensional graphene for electrode sheet for super capacitor of sodium ion battery or lithium ion battery (all claimed). ADVANTAGE - The three-dimensional graphene has different specific surface area and pore size which can be used in different fields and controllable specific surface area and pore size. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) electrode sheet comprising current collector and coating layer comprising three-dimensional graphene; (2) sodium ion battery comprising positive electrode and a negative electrode; and (3) lithium ion battery comprising positive electrode and a negative electrode.