Three-dimensional porous graphene nanomaterial and its preparation method and application

Abstract

The invention discloses a three-dimensional porous graphene nanomaterial and a preparation method and an application thereof. The three-dimensional porous graphene nanomaterial adopts a three-dimensional porous conductive network structure formed by layered graphene; and the pore diameters of big pores in the three-dimensional porous conductive network structure are 50-500nm. The preparation method comprises the steps of preparing a precursor-catalyst mixture, preparing a graphene-coated inorganic matter nanosphere composite material and removing inorganic matter nanospheres and impurities from the material. The three-dimensional porous graphene nanomaterial has the quick conduction three-dimensional conductive network, high conductivity, rich graded hole structures and large specific surface area and pore volumes, particularly rich and uniformly distributed mesoporous or big-porous structure; the preparation method has the advantages of simplicity and convenience, good on-site graphene catalyst growth effect and the like; and the graphene material has wide application prospects in new energy devices, such as a supercapacitor, a lithium ion battery, a lithium-sulfur battery and the like.

Description

Technical field [0001] The invention belongs to the field of nano carbon materials and their preparation, and relates to a three-dimensional porous graphene nano material and a preparation method and application thereof. Background technique [0002] Graphene is a kind of sp 2 A two-dimensional carbon material with a monoatomic layer formed by hybridizing carbon atoms with six-membered ring benzene units and infinitely extended. After the Geim group prepared stable single-layer graphene by mechanical exfoliation for the first time in 2004, graphene is due to its unique structure And excellent electrical properties, thermal properties, mechanical properties and optical properties. It has great application prospects in the fields of electronics, information, energy, materials and biomedicine, and has attracted widespread attention in research fields such as physics, chemistry, and materials science. How to prepare graphene materials on a large scale and at low cost is the basis for...

AI Technical Summary

Problems solved by technology

These graphene preparation methods have their own shortcomings: mechanical exfoliation, epitaxial growth, chemical vapor deposition, and arc methods are difficult to achieve large-scale production, and the yield is low; redox methods have long growth cycles, large environmental pollution, and graphene The product is easy to agglomerate, etc.; the production efficiency of the liquid phase stripping method is low

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