▎ 摘　　要

NOVELTY - Preparing three-dimensional graphene involves removing non-graphene components through selective physical and chemical reactions of materials containing a graphene structure to generate three-dimensional graphene having 10-90 vol.% graphene component, preferably 20-80 vol.%. It is also preferred that the generated three-dimensional graphene contains a through hole, and its porosity is greater than or equal to 10%. USE - Method for preparing three-dimensional graphene for the composite electrode material used as an electrode of electrochemical energy storage device including an ion battery comprising lithium ion battery, sodium ion battery, magnesium ion battery and aluminum ion battery, an ion capacitor comprising lithium ion capacitor, sodium ion capacitor, potassium ion capacitor, magnesium ion capacitor and aluminum ion capacitor, and an electrochemical capacitor (all claimed). ADVANTAGE - The method allows large-scale industrial production of three-dimensional graphene, is efficient, energy-saving, continuous and large-scale industrial production with low cost. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a composite electrode material, which involves preparing an electrode base material having through holes; passing the precursor of the dopant into the through hole of the electrode base material, and leaving the dopant in the hole as a simple substance, alloy or compound to form a dopant-containing material; and sealing dopant-containing material with the dopant so that the dopant is enclosed in the through hole of the material to prevent the dopant from coming into contact with the external gas or liquid to obtain desired composite electrode material, where the raw materials of the electrode base material include three-dimensional graphene and other electrode materials; and (2) a device for implementing the three-dimensional graphene production method, which includes a reactor for performing a gasification reaction, an inlet system for conveying a raw material gas into the reactor, a feeding system for conveying solid raw materials into the reactor, and a product collection system for directing the gas produced by gasification reaction out of the reactor and condensing for collection, where the reactor is provided with temperature control equipment, the middle portion of the reactor is a main reaction zone for filling solid raw materials, and the lower portion of the reactor is provided with a distributor; the bottom of reactor is provided with a raw material gas inlet and a solid slag discharge port, and a solid feed port and a product gas outlet are set at the top; a product gas outlet is provided with a filter, a air inlet system that includes a gas source for storing gas raw materials, and the gas source is connected to a raw material gas inlet at the bottom of the reactor through a pipeline; a feeding system is a multi-stage lock bucket feeding system, and the multi-stage lock buckets are arranged in series, a valve is arranged on the pipeline between adjacent lock buckets, and the solid raw material storage tank is connected to the inlet of first-stage lock bucket through the pipeline; a outlet of the final lock bucket is connected to the solid feed port of the reactor through a pipeline and a valve is also provided on the pipeline; a product collection system includes a condenser, the upstream end of the condenser is connected to the product gas outlet at the top of the reactor, and the downstream end of the condenser is connected in series with a condensed liquid collection device and an exhaust gas treatment device; the reactor is an entrained bed reactor, a fluidized bed reactor, a spouted bed reactor, a fixed bed reactor or a moving bed reactor; the lining and distributor of the reactor are made of a corrosion-resistant material includes quartz, graphite, ceramic, or stainless steel; a material containing a graphene structure is used to remove non-graphene components through a selective physicochemical reaction to generate a three-dimensional graphene.