▎ 摘　　要

NOVELTY - The method involves mixing (S100) a swelling material with an aqueous slurry solution to obtain the mixed slurry. The mixed slurry is mixed (S200) with the electrode active material and ground to obtain a coating solution. The coating liquid is coated (S300) on the current collector, dried, and cut to obtain a three-dimensional electrode. The swelling material includes at least one of lithium magnesium silicate, montmorillonite and kaolin. The electrode active material includes at least one of silicon oxide, silicon, lithium iron phosphate, nickel-cobalt-manganese (NCM) type ternary material, and nickel-cobalt-aluminum (NCA) type ternary material. The aqueous slurry includes at least one of carbon nanotube aqueous solution, MXene aqueous solution, graphene aqueous solution, superconducting carbon aqueous solution, chitosan aqueous solution, and polyacrylamide aqueous solution. The current collector included with copper foil. USE - Method for preparing three-dimensional electrode for an energy storage device i.e. lithium battery system, of an electric automobile. Can also be used for an intelligent power grid. ADVANTAGE - The method does not need to agglomerant, and has simple operation, low production cost and can be used for industrial mass production, and has high energy density, higher conductivity and higher mechanical strength. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a three-dimensional electrode; and a application of three-dimensional electrodes in lithium-ion batteries. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the method for preparing three-dimensional electrode for energy storage device (Drawing includes non-English language text). S100Step for mixing swelling material with aqueous slurry solution to obtain mixed slurry S200Step for mixing mixed slurry with electrode active material and ground to obtain coating solution S300Step for coating liquid on current collector, dried, and cut to obtain three-dimensional electrode