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Preparation method of graphene conductive slurry

A technology of conductive paste and graphene, which is applied in the direction of cable/conductor manufacturing, circuits, electrical components, etc., can solve the problems of difficult dispersion of conductive paste, easy stacking, easy agglomeration, etc., to avoid excessive local temperature and reduce preparation Effect of cost, excellent thermal conductivity

Active Publication Date: 2019-02-15
四川艾庞机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high specific surface area of ​​graphene, the van der Waals force exists between the graphene material layers, and the graphene sheets are easily stacked and easily agglomerated, which makes it difficult to disperse in the conductive paste.

Method used

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  • Preparation method of graphene conductive slurry
  • Preparation method of graphene conductive slurry
  • Preparation method of graphene conductive slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A preparation method for graphene conductive paste, comprising the following steps:

[0051] 1) 5g graphene is mixed with 100gNMP, and ultrasonically dispersed for 60min at an ultrasonic power of 1000W to ensure that graphene is completely dispersed in NMP to obtain a graphene dispersion;

[0052] 2) Add 3 g of multi-walled carbon nanotubes to 50 g of NMP, and perform ultrasonic dispersion treatment at an ultrasonic power of 1000 W for 60 minutes to ensure that the multi-walled carbon nanotubes are completely dispersed in the NMP to obtain a carbon material dispersion;

[0053] 3) After mixing the graphene dispersion obtained in step 1) with the carbon nanotube dispersion obtained in step 2), put it into a high-pressure homogenizer that can be sealed, then add 15g of lithium-ion battery special conductive agent carbon powder and 10g Superconducting carbon black, homogeneously treated for 4 hours under a pressure of 20MPa, and cooling circulating water was connected duri...

Embodiment 2

[0060] A preparation method for graphene conductive paste, comprising the following steps:

[0061] 1) 4g graphene is mixed with 80gNMP, and ultrasonically dispersed for 100min at an ultrasonic power of 1000W to ensure that the graphene is completely dispersed in the NMP to obtain a graphene dispersion;

[0062] 2) Add 25g of carbon black to 50g of NMP, and ultrasonically disperse for 30 minutes at an ultrasonic power of 800W to ensure that the carbon material is completely dispersed in the NMP to obtain a carbon black dispersion;

[0063] 3) after the graphene dispersion that step 1) obtains is mixed with the carbon black dispersion that step 2) obtains, put into a high-pressure homogenizer that can be sealed, then add 18g lithium-ion battery special conductive agent carbon powder and 22g super Conductive carbon black, homogeneous treatment at a pressure of 30MPa for 8 hours, access to cooling circulating water during the treatment process;

[0064] 4) Add 4g of PVDF into 19...

Embodiment 3

[0069] A preparation method for graphene conductive paste, comprising the following steps:

[0070] 1) 3g graphene is mixed with 80gNMP, and ultrasonically dispersed for 60min at an ultrasonic power of 1000W to ensure that the graphene is completely dispersed in the NMP to obtain a graphene dispersion;

[0071] 2) Add 10 g of acetylene black to 50 g of NMP, and perform ultrasonic dispersion treatment for 30 minutes at an ultrasonic power of 800 W to ensure that the carbon material is completely dispersed in the NMP to obtain a dispersion of acetylene black;

[0072] 3) after the graphene dispersion that step 1) obtains is mixed with the acetylene black dispersion that step 2) obtains, put into a high-pressure homogenizer that can be sealed, then add 20g lithium-ion battery special conductive agent carbon powder and 25g super Conductive carbon black, homogeneously treated at a pressure of 30MPa for 3 hours, and connected to cooling circulating water during the treatment process...

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Abstract

The invention discloses a preparation method of graphene conductive slurry. The preparation method comprises the following steps of 1) putting graphene into NMP, and carrying out ultrasonic dispersiontreatment to obtain a graphene dispersion liquid; 2) putting a carbon material into NMP, and carrying out ultrasonic dispersion treatment to obtain a carbon material dispersion liquid; 3) mixing thegraphene dispersion liquid with the carbon material dispersion liquid, then adding superfine carbon powder and superconductive carbon black, and carrying out high-pressure homogenization treatment toobtain a mixed solution; 4) adding PVDF into NMP to prepare a PVDF solution; and 5) adding the PVDF solution into the mixed solution, stirring, and adjusting the viscosity to obtain the graphene conductive slurry. According to the method, graphene with excellent thermal conductivity is adopted as a raw material, so that the graphene conductive slurry is endowed with excellent heat conduction performance, and when a battery is charged and discharged at a high rate, rapid heat conduction can be achieved, and the situation that the local temperature of the battery is too high is avoided; and thegraphene conductive slurry can be used for remarkably reducing the internal resistance of the battery, and improving the rate capability and the cycling performance of the battery.

Description

technical field [0001] The invention relates to the technical field of graphene materials, in particular to a method for preparing graphene slurry with high dispersion performance. 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. It is considered to be a revolutionary material in the future. With its special Graphene is a new type of two-dimensional atomic crystal composed of single atomic layers of carbon atoms connected by sp2 hybridization, with a theoretical thickness of 0.34nm, which is the thinnest found so far. two-dimensional materials. Because of its excellent electrical and thermal conductivity and electron transport channels, it is widely used in the conductive agent of lithium batteries. However, due to the high specific surface area of ​​graphene, van der Waals force exists between grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01M4/62
CPCH01B13/00H01M4/625Y02E60/10
Inventor 周磊秦晓娟吴钦文周佳林昭宁
Owner 四川艾庞机械科技有限公司
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