Method for manufacturing graphene/two-dimensional Co-Zn dual-core metal frame structure composite material

Abstract

The invention discloses a method for manufacturing a graphene / two-dimensional Co-Zn dual-core metal frame structure composite material. The method comprises: adding an aqueous solution of zinc nitratehexahydrate to a 2-methylimidazole aqueous solution, mixing uniformly, stirring, and performing water centrifugal washing, and then freezing and drying to obtain a precursor two-dimensional organometallic frame structure material ZIF-8; then dispersing the precursor two-dimensional organometallic frame structure material ZIF-8 into an aqueous solution of graphene oxide, stirring at room temperature to make the precursor two-dimensional organometallic frame structure material ZIF-8 uniformly dispersed, adding cobalt nitrate hexahydrate, and then continuing to stir and performing centrifugal washing to obtain an intermediate product; performing low temperature pyrolysis on the intermediate product under a nitrogen atmosphere, to obtain a target product graphene / two-dimensional Co-Zn dual-core metal frame structure composite material. The composite material prepared by the method has uniform morphology, stable structure and good toughness, and the process is green and energy saving, andis efficient and simple, and easy for scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a preparation method of a graphene / two-dimensional Co-Zn dual-core metal frame structure composite material. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, the development and utilization of new energy is imminent. Lithium-ion batteries have become a new type of energy that emerged under this background. Among the anode materials for lithium-ion batteries, the composite materials of transition metals and their oxides are favored by researchers due to their high theoretical capacity, good cycle performance and rate performance. [0003] Two-dimensional Co-Zn dual-core metal frame structure materials have poor anti-powdering ability when used as anode materials for lithium-ion batteries, so the capacity decay is more obvious during the charge and discharge process, and the cycle stabili...

AI Technical Summary

Problems solved by technology

[0003] Two-dimensional Co-Zn dual-core metal frame structure materials have poor anti-powdering ability when used as anode materials for lithium-ion batteries, so the capacity decay is more obvious during the charge and discharge process, and the cycle stability of the battery is generally poor.

The patent with the publication number CN107413204A discloses a method for preparing a highly oriented two-dimensional metal-organic framework nanosheet film by using graphene oxide-confined zinc oxide-induced growth. The active point is then introduced into a thin layer of graphene oxide film (GO) by pulling, and finally the carrier is placed in the MOFs nanosheet film synthesis solution and synthesized by a solvothermal system. After finely regulated growth, a continuous, uniform and highly oriented MOFs nanosheet is formed. Sheet-like membrane. Although the MOFs nano-sheet membrane obtained by this method has good stability and repeatability, the synthesis process is relatively cumbersome, and the layer of nano-scale ZnO used to locate the active site cannot be removed in subsequent work. So that pure graphene / MOFs composites cannot be obtained

The patent with the publication number CN108467490A discloses the preparation method and application of functionalized metal organic framework porous materials. The invention adopts a one-pot synthesis method to orderly dissolve graphene oxide-chitosan nanoparticles, zinc salts and organic ligands in DMF solvent, and then through continuous self-assembly reaction at room temperature to obtain functionalized metal-organic framework porous structure materials, this method uses a solvothermal method to synthesize the material, so the process is cumbersome and the efficiency is low, and the morphology of the product obtained by this method is uncontrollable and Graphene is easy to agglomerate

The patent with the publication number CN107983410A discloses a preparation method of a graphene / MOFs crystal composite hole catalyst, which uses a Lewis acid metallocene catalyst to uniformly disperse graphene in MOFs, and then removes the Lewis acid metallocene catalyst with an organic solvent to obtain Composite porous catalyst, which fully combines graphene and MOFs, and has good porosity, but the experimental process is cumbersome, the conditions are harsh, and it is not easy to mass produce

[0004] In summary, the current methods for synthesizing graphene / MOFs composites mainly include solvothermal synthesis, Pickering emulsion method, atomic layer deposition method, etc. However, these synthesis methods generally have defects such as complex process, harsh conditions and low yield.

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