Mechanical stripping method for preparing high-concentration graphene slurry from graphite and application of mechanical stripping method in preparation of polar plate material

A mechanical exfoliation and graphene technology, applied in graphene, chemical instruments and methods, fuel cells, etc., can solve the problems of difficult molding process, poor corrosion resistance, and difficult machining, and achieve convenient size adjustment, low equipment requirements, Inexpensive effect

Pending Publication Date: 2022-03-18
安徽大学绿色产业创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphite bipolar plate is currently the most commonly used bipolar plate for PEMFC in China. It has good electrical conductivity, thermal conductivity, stability, and corrosion resistance, but its mechanical properties are relatively poor, brittle, and d

Method used

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  • Mechanical stripping method for preparing high-concentration graphene slurry from graphite and application of mechanical stripping method in preparation of polar plate material
  • Mechanical stripping method for preparing high-concentration graphene slurry from graphite and application of mechanical stripping method in preparation of polar plate material
  • Mechanical stripping method for preparing high-concentration graphene slurry from graphite and application of mechanical stripping method in preparation of polar plate material

Examples

Experimental program
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Effect test

Example Embodiment

[0057] Example 1: Mechanical peeling method for graphene in graphite

[0058] 360 g of commercial graphite powder, 15 g of polyacrylic acid, and 5 g of carboxymethylcellulose (CMC), lithium chloride 10g and sodium borohydride were placed in a bucket of the sand mill, and then 1800 ml of deionized water was added, and the stirring was opened. The paddle is slowly rotated to preplute the deionized water with the bucket, and then the rotational speed of the stirring paddle allows the slurry to be uniformly stirred (speed at 200-300 r / min), and thoroughly stir the slurry 30min; 1.3kg diameter zircon beads were added to the grinding chamber, first set the speed of 400r / min, adjust the start of the extract pump (about 4 to 5 s for one, then increase the speed 500R / MIN until the speed reaches 2400R / min; record the grinding time (around 8h, the first grinding time can be appropriately extended).

[0059] After 8 h, the sand mill is closed, take some polishing slurry in the petri d...

Example Embodiment

[0062] Example 2: Mechanical stripping method for graphene in graphite

[0063] 360g commercial graphite powder, 10 g of polyacrylic acid, 5 g of waterborne polyurethane (waterborne polyurethane is solvent, no pollution, safe and reliable, superior mechanical properties, good compatibility and easy modification) and 5 g of carboxymethylcellulose sodium CMC), lithium chloride 10g and sodium borohydride 5g is placed in a bucket of a sand mill, and then 1800 ml of deionized water is added, and the stirring pad is initially rotated, and the deionized water is premixed with the bucket. After adjusting the rotational speed of the stirring paddle, the slurry can be quickly uniformly stirred (rotational speed at 200-300 r / min), and the slurry is thoroughly stirred for 30 min; weigh 1.3 kg diameter zircon beads to add the abrasive chamber, First set the speed of 400r / min, adjust the pump to start working (about 5s for one reduction), then increase the speed 500R / min up to 2400R / min...

Example Embodiment

[0067] Example 3: Mechanical stripping method for graphene graphene

[0068] 1. A 180g commercial graphite powder, 10 g of polyacrylic acid, and 10 g of carboxymethylcellulose (CMC), polyvinyl alcohol 2g, lithium chloride 10g and sodium borohydride were placed in a sander bucket, and then 1,800ml Ion water, open the first slow rotation of the stirred pad to preplute the deionized water to the bucket, and then adjust the rotational speed of the stirring paddle to make the slurry uniformly stirred (speed at 200-300R / min), The slurry was thoroughly stirred for 30 min; weigh 1.3 kg of zirconum beads of 0.8 mm to add the abrasive chamber, first set the rotational speed 400R / min, adjust the start of the extract pump (about 4 to 5 s for one, and then each The speed of 500r / min until the speed reaches 2400R / min; records the grinding time (around 8h, the first grinding time can be appropriately extended).

[0069] After 8 h, the sand mill is closed, take some polishing slurry in th...

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Abstract

The invention discloses a mechanical stripping method for preparing high-concentration graphene slurry from graphite and application of the method in preparation of a pole plate material, graphite powder is used as a raw material, lithium generated by in-situ micro-reaction is mechanically sheared, extruded and inserted into atomic interlamellar spacing of the graphite powder, so that the graphite interlamellar spacing is increased, the acting force is reduced, and the high-concentration graphene slurry is prepared. And then separating layers of graphite by multiple actions of medium zirconium bead shearing force increase, graphite surface dynamic bonding, solvation and polymer adsorption to form concentrated graphene slurry with the graphene content of 10-22wt%. The graphene slurry and the carbon fibers are compounded to prepare the polar plate material, and the polar plate material is formed through the procedures of graphene-assisted carbon fiber dividing and fixing, overlapping, heat treatment, mold pressing and the like. The graphene-carbon fiber-based polar plate material prepared by the method has the characteristics of thinness, lightness, corrosion resistance and the like, and is expected to be used for bipolar plates of fuel cells and flow batteries.

Description

technical field [0001] The invention relates to a mechanical stripping method for preparing high-concentration graphene slurry from graphite and its application in the preparation of polar plate materials. Background technique [0002] Graphene has excellent optical, electrical, and mechanical properties, and has important application prospects in materials science, micro-nano processing, energy, biomedicine, and drug delivery, and is considered to be a revolutionary material in the future. Graphene is the thinnest known material, a single-layer atomic thickness and a two-dimensional material with an open plane. It is a two-dimensional crystal in which carbon atoms are tightly packed into a hexagonal honeycomb lattice with sp2 hybridization. It is graphite, carbon nanotubes and Constituent unit of fullerene etc. Perfectly crystalline graphene combines excellent mechanical strength, thermal conductivity, light transmission, electrical conductivity, and chemical stability. A...

Claims

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Application Information

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IPC IPC(8): C01B32/19H01M8/0213
CPCC01B32/19H01M8/0213C01B2204/04Y02E60/50
Inventor 王俊中秦振陈希凡杨佳
Owner 安徽大学绿色产业创新研究院
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