Small-blocking-agent-loaded graphene conductive slurry and preparation method and application thereof

A conductive paste, graphene technology, applied in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc. problems, to achieve the effects of excellent electrical conductivity, improved performance, and elimination of stacking

Active Publication Date: 2015-03-25
苏州格瑞丰纳米科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the large specific surface area of ​​graphene, irreversible stacking is very easy to occur during processing, which makes the dispersion of graphene poor, which limits the performance of graphene's high electrical conductivity and high thermal conductivity.

Method used

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  • Small-blocking-agent-loaded graphene conductive slurry and preparation method and application thereof
  • Small-blocking-agent-loaded graphene conductive slurry and preparation method and application thereof
  • Small-blocking-agent-loaded graphene conductive slurry and preparation method and application thereof

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preparation example Construction

[0034] Another aspect of the present invention provides a kind of preparation method of the graphene conductive paste of loading small size barrier agent, please refer to figure 2 , in a typical implementation, it includes the following steps:

[0035] a, Graphene, small size barrier agent and solvent (dispersant) are mixed uniformly, obtain the first slurry;

[0036] b. Mixing the first slurry with the auxiliary conductive component and the dispersant under vacuum stirring to obtain the second slurry;

[0037] c. Sand grinding and sieving the second slurry to obtain the final highly conductive graphene slurry.

Embodiment 1

[0040] Take 30g of high-quality graphene powder (the average thickness is 3nm, the average sheet size is 20μm, and the average conductivity of the dry powder film is 10 5 S / m) and 10g carbon black are stirred in ethanol and ultrasonically 1h, after mixing evenly, dry at 80 ℃ to obtain the graphene powder of surface adsorption carbon black (such as image 3 ). The powder was stirred with 10g KS-6, 50g PVDF, and 900g NMP in a vacuum planetary mixer for 3 hours, then ground in a sand mill for 2 hours, and passed through a 200-mesh sieve to obtain an oily high-conductivity paste containing 5 wt% carbon. The morphology of the film formed by coating the highly conductive paste on the surface of aluminum foil is as follows: Figure 4 .

Embodiment 2

[0042] Take 30g of high-quality graphene powder (the average thickness is 3nm, the average sheet size is 20μm, and the average conductivity of the dry powder film is 10 5 S / m) and 10 g of 10,000-mesh graphite were stirred in ethanol and ultrasonicated for 1 h, and then dried at 80° C. to obtain graphene powder with carbon black adsorbed on the surface. The powder was stirred with 10g CNTs, 300g LA132 binder, and 650g water in a vacuum planetary mixer for 3 hours, then ground in a sand mill for 2 hours, and passed through a 200-mesh sieve to obtain an aqueous high-conductivity paste containing 5 wt% carbon.

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Abstract

The invention discloses small-blocking-agent-loaded graphene conductive slurry and a preparation method and application of the small-blocking-agent-loaded graphene conductive slurry. The conductive slurry comprises 1wt% to 10 wt% of conductive components, 0.5 wt% to 8 wt% of dispersing agents and 85 wt% to 95 wt% of solvents. The conductive components comprise small-blocking-agent-loaded graphene serving as the basic conductive components and auxiliary conductive components. According to the slurry, small blocking agents are loaded on the graphene so that stacking among the graphene can be eliminated thoroughly, the processing difficulty of the graphene is lowered, the dispersity of the graphene in the conductive slurry is improved greatly, and thus the conductive slurry excellent in performance is obtained; according to electronic devices formed through the conductive slurry, especially energy storage devices, such as li-ion battery products which have excellent conductive performance and heat conducting performance, the power density, rate capacity, tap density, circulation stability, and other performance of the electronic devices are improved greatly, the service life of the electric devices is greatly prolonged, and the conductive slurry is simple in preparation process and low in cost.

Description

technical field [0001] The invention relates to a conductive paste and a preparation method thereof, in particular to a highly conductive graphene paste, a preparation method and application thereof, and belongs to the technical field of conductive paste and conductive agent. Background technique [0002] With the increasing demand for lithium-ion batteries in the field of power batteries, problems such as large internal resistance, low power density, short cycle life, low stability, and easy heating to cause safety accidents have become increasingly prominent and need to be resolved urgently. Among them, the conductivity of materials such as manganese oxide and phosphate are very low, but they must maintain good high-rate charge and discharge characteristics and a long service life. This is a huge challenge that the power lithium-ion battery industry is currently facing. challenge. The conductivity of the negative electrode graphite material is slightly better, but during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01B13/00H01M4/62
CPCY02E60/10
Inventor 刘立伟李伟伟郭玉芬陈明亮李奇邱胜强刘朝军
Owner 苏州格瑞丰纳米科技有限公司
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