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Graphene composite conductive slurry as well as preparation method and application thereof

A graphene composite, conductive paste technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of agglomeration, graphene dispersion hindering application, etc., and achieve the effect of low cost, excellent electrochemical performance, and improved electrode capacity.

Inactive Publication Date: 2018-02-13
鹏威多凌(浙江)新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a strong π-π interaction force between graphene layers, and the exfoliated graphene often aggregates during storage and use, so the dispersion of graphene has always been a major problem hindering its application.

Method used

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  • Graphene composite conductive slurry as well as preparation method and application thereof
  • Graphene composite conductive slurry as well as preparation method and application thereof

Examples

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preparation example Construction

[0040] Another aspect of the embodiments of the present invention provides a method for preparing a graphene composite conductive paste, which includes:

[0041] (1) mix expanded graphite, dispersant and solvent uniformly, and carry out shear peeling, make the first slurry;

[0042] (2) adding the non-flaky conductive agent to the first slurry, and then at least partially intercalating the non-flaky conductive agent by grinding to embed the non-flaky conductive agent between the graphene sheets to obtain the second slurry, Obtain graphene composite conductive paste.

[0043] As one of the preferred schemes, step (1) specifically includes: uniformly mixing expanded graphite, dispersant and solvent, and performing shear dispersion treatment in a high-speed mixer at a speed of 500 to 1000 r / min for 5 to 60 minutes, and then placing the graphite on sand The first slurry is obtained by performing shearing and peeling treatment in the mill at a rotational speed of 1000-3000 r / min f...

Embodiment 1

[0064] A kind of preparation method of graphene composite conductive paste in the present embodiment comprises the following steps:

[0065] 1) Mix 80g of worm graphite (100 mesh) expanded by 400 times, 10g of polyvinylpyrrolidone and 1850g of N-methylpyrrolidone, use a high-speed mixer to stir and disperse at a speed of 500r / min for 30 minutes, and then use a sand mill to grind, The rotating speed is 2800r / min, and the grinding time is 60 minutes;

[0066] 2) Take 60g of multi-walled carbon nanotubes and add them to the above slurry for further grinding, the rotation speed is 800r / min, and the grinding time is 30 minutes;

[0067] 3) Adjust the viscosity of the slurry obtained above with polyvinylidene fluoride, and adjust the viscosity to 5000 mPa·s.

[0068] 4) The graphene composite slurry is used in the ternary positive electrode material of lithium ion battery, according to the mass fraction of ternary active material, polyvinylidene fluoride, graphene composite conduct...

Embodiment 2

[0079] A kind of preparation method of graphene composite conductive paste in the present embodiment comprises the following steps:

[0080] 1) Mix 20g of worm graphite (800 mesh) expanded by 100 times with 1860g of N-methylpyrrolidone, use a high-speed mixer to stir and disperse at a speed of 1000r / min for 30 minutes, then use a sand mill to grind at a speed of 3000r / min, Grinding time is 5 minutes;

[0081] 2) Take 120g of acetylene black and add it to the above slurry for further grinding, the rotating speed is 3000r / min, and the grinding time is 30 minutes;

[0082] 3) Adjust the viscosity of the slurry obtained above with polyvinyl alcohol, and adjust the viscosity to 4000 mPa·s.

[0083] 4) The graphene composite conductive paste is used in the lithium iron phosphate positive electrode material of lithium ion battery. After testing, it is found that the graphene composite conductive paste prepared in this embodiment can reduce the dosage while reducing the dosage compar...

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Abstract

The invention discloses graphene composite conductive slurry as well as a preparation method and application thereof. The graphene composite conductive slurry comprises graphene, a non-flaky conducting agent, a dispersing agent, a solvent and a viscosity regulator; the non-flaky conducting agent is at least partially embedded between graphene flakes. The preparation method comprises the followingsteps: mixing expanded graphite, the dispersing agent and the solvent uniformly and performing shear stripping to prepare first slurry; adding the non-flaky conducting agent into the first slurry, andperforming partial intercalation treatment at least through a grinding mode to disperse the non-flaky conducting agent and the graphene flakes uniformly to prepare second slurry. The graphene composite conductive slurry has excellent dispersing stability, enables an active material to show up excellent electrochemical property when being in a lithium ion battery, and can improve the electrode capacity, reduce the internal resistance of the battery and improve cycling performance; meanwhile, the preparation method has the advantages of simple process, high operability, wide raw material source, low cost and the like.

Description

technical field [0001] The invention relates to a graphene composite conductive paste, in particular to a graphene composite conductive paste, a preparation method thereof and an application in lithium ion batteries, belonging to the technical field of lithium ion battery conductive agents. Background technique [0002] The positive electrode active material of lithium-ion batteries is lithium-containing transition metal oxides, and charge and discharge are realized by lithium ions shuttling back and forth in these oxides. However, the electrical conductivity of these transition metal oxides is usually very low, which greatly limits the high-rate charge-discharge performance of Li-ion batteries. Therefore, when preparing electrodes from these active materials, it is usually necessary to add conductive agents to improve their conductivity. Although the conductivity of negative electrode graphite is very good, the expansion and contraction effect experienced by graphite after...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 李秋丽张凌孙淑华
Owner 鹏威多凌(浙江)新材料科技股份有限公司
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