▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene multi-level network material by using composite template, comprises e.g. (i) chemically or physically modifying three-dimensional metals to improve hydrophilicity, (ii) preparing a precursor solution by using a water-soluble salt, a carbon source and deionized water, (iii) placing the modified three-dimensional metal in the precursor solution, removing the air remaining in the three-dimensional metal, and sufficiently contacting the precursor solution, (iv) drying the modified three-dimensional metal attached with the precursor solution to obtain a precursor block, and (v) placing the precursor block in a tube furnace, heating to 700-800 degrees C for 20-40 seconds under a flowing protective gas atmosphere, carbonizing the carbon source, forming the carbon network/graphene hybrid structure by using catalytic action of the three-dimensional metal matrix and confinement of salt template to obtain a carbon network/three-dimensional metal material. USE - The material is useful for energy storage device (claimed). DETAILED DESCRIPTION - Preparing three-dimensional graphene multi-level network material by using composite template, comprises (i) chemically or physically modifying three-dimensional metals to improve hydrophilicity, (ii) preparing a precursor solution by using a water-soluble salt, a carbon source, and deionized water, (iii) placing the modified three-dimensional metal in the precursor solution, removing the air remaining in the three-dimensional metal, and sufficiently contacting the precursor solution, (iv) drying the modified three-dimensional metal attached with the precursor solution to obtain a precursor block, (v) placing the precursor block in a tube furnace, rapidly heating to 700-800 degrees C for 20-40 seconds under a flowing protective gas atmosphere, carbonizing the carbon source, simultaneously forming the carbon network/graphene hybrid structure by using the catalytic action of the three-dimensional metal matrix and the confinement of the salt template to obtain a carbon network/three-dimensional metal material, and rapidly cooling to room temperature, (vi) removing the three-dimensional metal template from the carbon network/three-dimensional metal material to obtain a black block, and removing the template, and (vii) immersing the black block in absolute ethanol, and supercritically drying.