High-strength, high-conductivity and bending-resistant graphite foil and preparation method thereof

Abstract

The invention discloses a high-strength, high-conductivity and bending-resistant graphite foil and a preparation method thereof. The method comprises the following steps: uniformly mixing a graphene oxide water solution and delaminated expansion graphene sheets based on certain ratio to obtain high-viscosity hydrogel; uniformly coating a substrate with the hydrogel according to a coating method; performing an evaporation-induced self-assembling method to obtain a layered graphite oxide and delaminated graphene sheet composite foil; chemically reducing under room temperature; allowing standingstill to obtain the corresponding graphene foil. The method is simple and convenient in preparation processes; the production process is environmentally friendly; the used raw material cost is low; equipment industry is compatible, so that massive production and application can be performed; in addition, the prepared graphene foil is outstanding in mechanical strength, high in conductivity, and high in chemical stability and temperature stability; wide-range bending can be performed; the graphene foil has a good application prospect in flexible electronic devices and has extremely high competitiveness in the existing market.

Description

technical field [0001] The invention relates to a graphite foil with high strength, high conductivity and bending resistance and a preparation method thereof. Background technique [0002] Graphite is a mineral crystallized by carbon. The lattice is a hexagonal layered structure. Because of its special structure, graphite has the following good properties: high temperature resistance (melting point 3850 ° C), low density, excellent electrical and thermal conductivity , chemical stability, plasticity and so on. Graphite foil is a foil-shaped material made of expanded graphite as a raw material through simple hot pressing. This material has inherited the characteristics of graphite itself and has been widely used in petrochemical, thermal and conductive substrates, sealing gaskets, Electromagnetic shielding and energy-related equipment and other fields. However, the mechanical properties of graphite foil materials prepared by this traditional method are poor (tensile strengt...

AI Technical Summary

Problems solved by technology

However, these two methods require the use of non-conductive and heat-conducting commercial polymers as reinforcements, which will greatly sacrifice the electrical and thermal conductivity of graphite itself. In addition, the low thermal decomposition temperature and chemical instability of the polymer itself, and It will make the high temperature resistance and chemical stability of the graphite foil itself no longer exist

In addition, high-temperature heat treatment (higher than 2500°C) can also enhance the mechanical strength of graphite foil, but this method is very expensive and has strict requirements on industrial equipment, so it is difficult to compete with the price in the market. cheap way to compete

Images