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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

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

AI Technical Summary

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 difficult to machine, resulting in high costs. ;Metal bipolar plate is easy to process, can be mass-produced, low cost, thin thickness, high volume specific power and specific energy of the battery, but poor corrosion resistance, difficult forming process

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

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Experimental program
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Effect test

Embodiment 1

[0057] Embodiment 1: the mechanical exfoliation method of graphene prepared from graphite

[0058] Weigh 360g of commercial graphite powder, 15g of polyacrylic acid, 5g of sodium carboxymethylcellulose (CMC), 10g of lithium chloride and 5g of sodium borohydride into the barrel of the sand mill, then add 1800ml of deionized water, and start stirring The paddle rotates slowly first to pre-mix the deionized water and the material in the bucket to form a slurry, and then adjust the rotation speed of the stirring paddle so that the slurry can be stirred evenly at a faster speed (rotation speed is 200-300r / min), and the slurry is fully stirred 30min; Weigh 1.3kg of zirconium beads with a diameter of 0.8mm and add them into the grinding chamber. min until the rotation speed reaches 2400r / min; record the grinding time (about 8h, the first grinding time can be extended appropriately).

[0059] After 8 hours, turn off the sand mill, take part of the grinding slurry in a petri dish, sea...

Embodiment 2

[0062] Embodiment 2: the mechanical exfoliation method of graphene prepared from graphite

[0063] Take by weighing 360g commercial graphite powder, 10g polyacrylic acid, 5g water-based polyurethane (water-based polyurethane uses water as solvent, no pollution, safe and reliable, excellent mechanical properties, good compatibility and easy modification) and 5g sodium carboxymethyl cellulose ( CMC), 10g of lithium chloride and 5g of sodium borohydride are put into the barrel of the sand mill, then add 1800ml of deionized water, turn on the stirring paddle and rotate slowly so that the deionized water and the material in the barrel are pre-mixed into a slurry , finally adjust the rotating speed of the stirring paddle so that the slurry can be evenly stirred faster (rotating speed is 200-300r / min), fully stir the slurry for 30min; take 1.3kg of zirconium beads with a diameter of 0.8mm and add them into the grinding chamber, First set the rotation speed to 400r / min, adjust the pum...

Embodiment 3

[0067] Embodiment 3: graphite prepares the mechanical exfoliation method of graphene

[0068] Take by weighing 180g commercial graphite powder, 10g polyacrylic acid and 10g sodium carboxymethyl cellulose (CMC), polyvinyl alcohol 2g, lithium chloride 10g and sodium borohydride 5g are put into the feed bucket of sand mill, add 1800ml behind to remove For ionized water, turn on the stirring paddle to rotate slowly to pre-mix the deionized water and the material in the bucket into a slurry, and then adjust the speed of the stirring paddle so that the slurry can be stirred evenly and quickly (rotating speed is 200-300r / min), Fully stir the slurry for 30 minutes; weigh 1.3kg of zirconium beads with a diameter of 0.8mm and put them into the grinding chamber, first set the speed at 400r / min, adjust the pump to start working (about 4 to 5s for one pumping), and then every Increase the rotation speed by 500r / min until the rotation speed reaches 2400r / min; record the grinding time (about...

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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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