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Method for preparing graphene composite conductive paste by microwave-ultrasonic and products obtained therefrom

A technology of graphene composite and conductive paste, which is applied in the direction of chemical instruments and methods, circuits, carbon compounds, etc., can solve the problems of sheet thickness, easy agglomeration, poor stability of paste, etc., and achieve improved conductivity and small viscosity changes , good stability

Active Publication Date: 2020-09-18
海科技术创新服务(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical problems of thick graphene sheets, poor slurry stability, and easy agglomeration in the above-mentioned background technology. The present invention provides a method for preparing graphene composite conductive paste using microwave-ultrasound and the resulting product, and the prepared graphite Oxygen composite conductive paste has good stability, thin lamellar structure, and high conductivity

Method used

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  • Method for preparing graphene composite conductive paste by microwave-ultrasonic and products obtained therefrom
  • Method for preparing graphene composite conductive paste by microwave-ultrasonic and products obtained therefrom
  • Method for preparing graphene composite conductive paste by microwave-ultrasonic and products obtained therefrom

Examples

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Effect test

Embodiment 1

[0046] Weigh 2000 mesh flake graphite, use potassium permanganate as oxidant, concentrated sulfuric acid and potassium permanganate as intercalation agent (the mass ratio of flake graphite, potassium permanganate and concentrated sulfuric acid is 1:1:4) in a water bath at 35 °C, stirred for 60 min for acidification intercalation. After acidification and intercalation, wash with 5% dilute hydrochloric acid deionized water to neutral in turn, and use suction filtration to put the expandable graphite suspension washed to neutral into the Buchner funnel of the suction filter bottle, and use qualitative filter paper Suction filtration, the filter cake is left on the filter paper, and the filtrate enters the suction filtration bottle. The filter cake was vacuum-dried at 60 °C for 16 h to obtain expandable graphite. The expandable graphite was put into a microwave reactor, and under a nitrogen protective atmosphere, the power was controlled at 1500W for microwave expansion treatment...

Embodiment 2

[0055] Weigh 2000 mesh flake graphite, use potassium permanganate as oxidant, concentrated phosphoric acid and potassium permanganate as intercalation agent (mass ratio of flake graphite, potassium permanganate and concentrated phosphoric acid is 5:1:4), in a water bath Stir at 35°C for 60 min for acidification intercalation. Wash with 8% dilute hydrochloric acid and deionized water until neutral, and use suction filtration to put the expandable graphite suspension washed to neutral into the Buchner funnel of the suction filter bottle, and use qualitative filter paper for suction filtration. The filter cake is left on the top, and the filtrate enters the suction filter flask. Vacuum-dry the filter cake at 100°C for 24 hours to obtain expandable graphite. Put the expandable graphite into a microwave reactor, and in a nitrogen atmosphere, control the power to 500W for microwave expansion treatment for 200s to obtain expanded graphite. 0.25g of expanded graphite obtained in the ...

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Abstract

The invention discloses a method for preparing graphene composite conductive paste by using microwave-ultrasound and a product thereof, belonging to the technical field of graphene preparation. The method comprises the following steps: 1) acidifying and intercalating graphite, washing and drying in sequence to obtain expandable graphite; 2) subjecting expandable graphite to a microwave expansion treatment under atmosphere protection to obtain expanded graphite; 3) expanding the graphite Graphite is mixed with a solvent and a carbon black conductive agent, and the resulting mixture is subjected to secondary microwave expansion treatment under the protection of the atmosphere to obtain a pre-slurry; 4) The pre-slurry and glue are mixed and then ultrasonically stirred to obtain graphene Composite conductive paste. The graphene composite conductive paste prepared by the method provided by the invention has a complete lamellar structure, good stability and good electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing graphene composite conductive paste by using microwave-ultrasound and a product obtained therefrom. Background technique [0002] Graphene is a two-dimensional material with a honeycomb crystal structure composed of a single layer of carbon atoms in the form of hexagonal close packing. Graphene has many excellent properties, such as excellent electrical conductivity, thermal conductivity, mechanical properties, super high specific surface area, etc. , has received widespread attention from everyone, and has been widely used in many fields such as energy storage, solar photovoltaic devices, transistors, sensors, and detectors. However, due to the poor quality of graphene in the graphene slurry, the graphene sheets tend to accumulate and agglomerate, which greatly reduces the specific surface area. The poor stability of the slurry greatly limits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/08C01B32/225H01M4/62H01M10/0525C04B111/94
CPCC04B26/08C04B2111/94C04B2201/10C01B32/225H01M4/625H01M10/0525C04B14/024C04B14/022C04B24/008Y02E60/10
Inventor 牛庆荣马俊青李荣苗力孝
Owner 海科技术创新服务(江苏)有限公司
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