Continuous-phase spongy graphene material as well as preparation method thereof

Abstract

The invention provides a continuous-phase spongy graphene material. The core part of the material is provided with a foamed nickel substrate; the outer surface of the foamed nickel substrate is coated with graphene obtained by a CH4 gas via CVD (chemical vapor deposition); the graphene material is integrated continuous-phase spongy block graphene. The invention also provides two preparation methods of the continuous-phase spongy graphene material, wherein one preparation method provided by the invention is characterized in that the preparation material is the continuous-phase spongy graphene material two end surfaces of which are not provided with graphene, and can serve as the positive electrode or the negative electrode material of a lithium ion battery, and the advantages of maximum current carrier, favorable cycle stability, good heat conduction, rapid electric conduction, increase of electrolyte contact surface, and volume conservation can be realized; the other preparation method provided by the invention is characterized in that the preparation material is an integral continuous-phase spongy graphene heat radiation material, serves as a heat radiation material of heat radiation devices of a computer CPU, an LED light source, a tablet personal computer, a mobile phone and the like, and has better heat conduction and heat radiation effects compared with a traditional heat radiation material.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a graphene material, in particular to a continuous-phase spongy graphene material deposited on the surface of foamed nickel and a preparation method thereof. Background technique [0002] Nickel foam is a piece of nickel mesh with many tiny pores made of metallic nickel. This kind of mesh plate called foam nickel is mostly used as the electrode plate of high-efficiency batteries. Because there are many tiny pores, the nickel plate is fully in contact with the battery liquid, and the contact area is increased, thereby improving the battery life. Performance, so it is widely used as a manufacturing material for battery electrode plates. However, because nickel foam is a flake, its use as an electrode material has certain limitations, such as many impurities, poor dispersion, and poor electrical conductivity. The power density and energy density of batteries made with it cannot...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a continuous phase spongy graphene material deposited on the surface of a foamed nickel substrate and a preparation method thereof, which puts the foamed nickel substrate that has been cut to size and sprayed at both ends or pasted and sealed into the CVD gas phase. In the deposition furnace, by vacuuming and exhausting, adding H 2 Protective gas, then gas CH 4 , after heating up, vapor deposition and heat preservation are carried out, and a continuous phase spongy graphene material that can meet the power density and energy density requirements of high-efficiency batteries is deposited on the surface of the nickel foam substrate. It has good cycle stability and high thermal conductivity. , high electrical conductivity, good electrical conductivity, and extremely high electron transmission speed, which solves the problem that the existing sheet-shaped discontinuous phase graphene materials cannot achieve the nature of graphene

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