Composite electrode material and preparation method thereof

The invention belongs the technical field of composite electrode materials and preparation methods thereof, and specifically relates to a 3D tree-shaped nickel hydroxide/reduction-oxidation graphite composite electrode material and a preparation method thereof. According to the invention, foamed nickel is used as a 3D skeleton, a current collector, a reducing agent and a nickel source; a low-concentration graphite oxide is used as an oxidizing agent a nickel hydroxide support body, a carbon source, an active material and a connection part between nickel hydroxide and the current collector; and a hydrothermal method is further adopted to synthesize the composite material of a 3D tree-shaped structure, wherein foamed nickel is used as the trunk, reduction-oxidation graphite is used as branches, and the graphite oxide is used as leafs. In the 3D tree-shaped structure, reduction-oxidation graphite is respectively connected with the graphite oxide and foamed nickel, so that the electricity conductivity is better,