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...

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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.

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