High-concentration and high-purity graphene slurry and preparation method and application thereof

A graphene, high-purity technology, applied in the field of high-concentration, high-purity and highly pre-dispersed graphene slurry and its preparation, can solve the problems of low yield, high cost, and difficulty in maintaining a high degree of graphene pre-dispersion. , to achieve the effect of low viscosity and high concentration cleavage

Inactive Publication Date: 2016-08-24
SUPERCDONGGUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the liquid-phase cleavage preparation technology of graphene slurry is still limited to an extremely low cleavage concentration (generally 0.001-0.10wt%). However, the yield is low, the cost is high, and it is not easy to prevent contamination by impurities and water; it is difficult to maintain a high degree of pre-dispersion of graphene by other methods of increasing the concentration

Method used

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  • High-concentration and high-purity graphene slurry and preparation method and application thereof
  • High-concentration and high-purity graphene slurry and preparation method and application thereof
  • High-concentration and high-purity graphene slurry and preparation method and application thereof

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Embodiment 1

[0035] A high-concentration, high-purity, highly pre-dispersed graphene slurry and its preparation:

[0036] Add 10 parts of graphene, 2 parts of polyurethane, 2 parts of hydroxypropyl methylcellulose, 1 part of polyethylene oxide, 0.01 part of dimethylsiloxane, and 85 parts of N-methylpyrrolidone in the material tank in parts by mass ;

[0037] According to the above formula, graphene, polyurethane, hydroxypropyl methylcellulose, polyethylene oxide, dimethylsiloxane, and N-methylpyrrolidone are high-energy cleaved and dispersed uniformly to obtain the graphene slurry material;

[0038] With conductive agent: polyvinylidene fluoride: the weight ratio of lithium iron phosphate=1:3:96 makes lithium ion battery positive electrode slurry, and the conductive agent in formula adopts graphene slurry of the present invention and untreated For graphene, add N-methylpyrrolidone to control the viscosity of the slurry and stir evenly. After 4 hours, the slurry is coated on a PET film an...

Embodiment 2

[0040] A high-concentration, high-purity, highly pre-dispersed graphene slurry and its preparation:

[0041] Add 12 parts of graphene, 0.2 parts of sodium carboxymethyl cellulose, 0.2 parts of xanthan gum, 0.2 parts of guar gum, 0.2 parts of carrageenan, 0.2 parts of GP type defoamer, and 87 parts of water in the material tank according to the number of parts by mass middle;

[0042] According to the above formula, graphene, sodium carboxymethyl cellulose, xanthan gum, guar gum, carrageenan, GP type defoamer, water, high-energy cleavage, and uniform dispersion can obtain the graphene slurry ;

[0043] With conductive agent: water-based epoxy resin: water-based epoxy curing agent: the weight ratio of calcium carbonate=1:33:33:33 prepares water-based epoxy coating, and the conductive agent in the formula adopts graphene slurry of the present invention respectively As well as untreated graphene, add an appropriate amount of water to control the viscosity, add a small amount of ...

Embodiment 3

[0045] A high-concentration, high-purity, highly pre-dispersed graphene slurry and its preparation:

[0046] Add 8 parts of graphene, 2 parts of nano conductive carbon black, 2 parts of polyamide wax, 0.5 part of hydroxypropyl methylcellulose, 1.5 parts of polyethylene glycol, 0.01 part of dimethylsiloxane, 44 parts by mass parts Parts of N-methylpyrrolidone, 44 parts of N-vinylpyrrolidone in material tank;

[0047] According to the above formula, graphene, polyamide wax, hydroxypropyl methylcellulose, polyethylene glycol, dimethyl siloxane, N-methylpyrrolidone, N-vinylpyrrolidone, high-energy cleavage, uniform dispersion , to obtain the graphene slurry;

[0048]With conductive agent: polyvinylidene fluoride: the weight ratio of lithium iron phosphate=2:3:95 makes lithium ion battery positive electrode slurry, and the conductive agent in formula adopts graphene slurry of the present invention and untreated For graphene, add N-methylpyrrolidone to control the viscosity of the...

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Abstract

The invention belongs to the technical field of new materials, and particularly relates to high-concentration and high-purity highly pre-dispersed graphene slurry and a preparation method and an application of thereof. The graphene slurry is prepared from the following raw materials in parts by weight: 0.5-15 parts of graphene, 0.1-20 parts of an anti-fold cleavage dispersing agent, 0.01-1 part of a defoamer and 80-95 parts of a solvent; the graphene slurry is prepared through high-energy cleavage and dispersion; the viscosity of the prepared graphene slurry is smaller than 10,000cPs; and the metal impurity content in the slurry is smaller than 100ppm. High-concentration cleavage and folding prevention can be achieved; and the graphene slurry has the properties of extremely high purity and low viscosity, is very easy to be dispersed for the second time, and is suitable for an automatic feeding system.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a high-concentration, high-purity and highly pre-dispersed graphene slurry and a preparation method and application thereof. Background technique [0002] Graphene is a two-dimensional sheet carbon nanomaterial, which is the basic building block of graphite and carbon nanotubes. Theoretically, single-layer graphene has up to 2630m 2 / g specific surface area, 10 -6 The resistivity of ohm.cm, the thermal conductivity can reach 5300W / (m.K), and its Young's modulus (1100GPa) and breaking strength (125GPa) are also comparable to carbon nanotubes. It is precisely because graphene has so many unique properties that graphene has great application prospects in the fields of electronics, information, energy, materials and biomedicine. [0003] When graphene is added to battery slurry, coating, etc. as a conductive, thermally conductive, and reinforcing material, due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 李琦李召平黄希明吕涛
Owner SUPERCDONGGUAN TECH
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