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A kind of graphite foil with high strength, high conductivity and bending resistance and preparation method thereof

A technology of graphite foil and graphene, applied in coating and other directions, can solve the problems of graphite foil's high temperature resistance and chemical resistance, low thermal decomposition temperature and chemical instability, sacrificing graphite's electrical conductivity and thermal conductivity, etc. Achieve the effect of good folding capacitor performance, good application prospects, and obvious reduction in ohmic resistance

Active Publication Date: 2020-06-09
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A kind of graphite foil with high strength, high conductivity and bending resistance and preparation method thereof
  • A kind of graphite foil with high strength, high conductivity and bending resistance and preparation method thereof
  • A kind of graphite foil with high strength, high conductivity and bending resistance and preparation method thereof

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Embodiment 1

[0049]Preparation of graphene oxide: Add 3.0g 325 mesh flake graphite powder into a 500mL flask, slowly add 138mL 98wt% concentrated sulfuric acid in 12mL deionized water, mix well and cool to room temperature, slowly add diluted concentrated sulfuric acid into the 500mL flask , keep stirring while controlling the temperature of the reaction system to always be lower than 5°C. Under the condition of keeping stirring, slowly add 9.0g potassium permanganate powder, this process lasts for 2 hours, control the system temperature below 5°C, and continue the reaction for 48 hours, pour the above reaction mixture system into the ice-water mixing bath to terminate the reaction , under the condition of keeping stirring, slowly add 30wt% hydrogen peroxide aqueous solution dropwise until no bubbles are generated. At this moment, the solution turned from brown to yellow, and the above-mentioned yellow solution was vacuum filtered, and the resulting filter cake was washed with 500 mL of di...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C08L25/06C08L67/02
CPCC08J7/06C08J2325/06C08J2367/02
Inventor 李春曲良体吴明懋
Owner TSINGHUA UNIV
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