Carbon nanotube conductive agent high shear homogenizer

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Carbon nanotubes are a new type of carbon material, consisting of several to dozens of coaxial circular tubes made up of carbon atoms arranged in a hexagonal pattern. The layers are kept at a fixed distance of about 0.34 nm, and the diameter is generally between 2-20 nanometers.

Conductive agents have been widely used in lithium-ion batteries. Currently, conductive agents used in lithium-ion batteries mainly include carbon black, graphite, carbon nanotubes, carbon nanofiber graphene, etc. The conventional use of these conductive agents is to directly add them to the positive and negative electrode materials for dispersion. In practical applications, it has been found that this direct addition method has problems with uneven dispersion and agglomeration of conductive agents, which seriously affects the conductivity of lithium-ion battery electrodes and the charging and discharging efficiency of the battery.

Advantages and disadvantages of carbon nanotube conductive paste:

(1) Carbon nanotubes have good electronic conductivity, and their fibrous structure can form a continuous conductive network in electrode active materials;

(2) After adding carbon nanotubes, the electrode sheet has higher toughness, which can improve the peeling caused by material volume changes during charge and discharge processes and increase the cycle life;

(3) Carbon nanotubes can significantly enhance the permeability of electrolytes in electrode materials;

(4) The main disadvantage of carbon nanotubes is that they are not easily dispersed, tend to aggregate with liquids after being borrowed, and the powder still flies in the air.

Obtain carbon nanotubes with a length of 200-400 microns, binders, and solvents; Mixing and treating the carbon nanotubes, the binder, and the solvent using a homogenizer to obtain a carbon nanotube conductive slurry.

Based on 100% of the total mass of the carbon nanotube conductive slurry, the carbon nanotube conductive slurry comprises: 0.01-1.5% by mass of the carbon nanotubes, 3-5% by mass of the binder, and the remaining solvent.

The step of mixing and treating the carbon nanotubes, the binder, and the solvent using a homogenizer includes: adding the binder to the solvent, stirring and dissolving the binder at 40-60 ℃ to obtain a mixture of the binder and the solvent.

Add carbon nanotubes to the mixture and use a homogenizer for mixing treatment to obtain a carbon nanotube conductive slurry.

The step of mixing and treating the carbon nanotubes, the binder, and the solvent using a homogenizer comprises:

Add carbon nanotubes to the solvent and mix them using a homogenizer to obtain a dispersion of carbon nanotubes;

Add a binder to the dispersion of carbon nanotubes, stir and dissolve the binder at 40-60 ℃ to obtain a carbon nanotube conductive slurry.

Characterized in that the homogenizer is selected as a high shear homogenizer.

The rotational speed of the high shear homogenizer is 8000-20000 rpm.

Difficulty in dispersing carbon nanotubes:

Carbon nanotube conductive paste disperser, carbon nanotube dispersion, in fact, is the so-called dispersion of nano materials. During the dispersion or grinding of nano powder, because the size of the powder changes from large to small, van der Waals force and Brownian motion phenomenon gradually become obvious and important. Choosing appropriate additives to avoid powder re aggregation and selecting appropriate dispersion equipment to control the temperature of the grinding slurry to reduce or avoid the influence of Brownian motion are key factors for the successful grinding and dispersion of nanoscale powders in wet grinding and dispersion methods.

It is not difficult to solve these difficulties, as long as the carbon nanotube powder and the medium (water, NMP, PVDF) are fully dispersed and uniform. The SID grinding and dispersing homogenizer is developed for materials that are prone to agglomeration and have poor dispersion effects. Its design is a combination of colloid mill and disperser, which is an upgraded version of colloid mill. The upper layer adopts a cone mill design, allowing materials to be ground between small gaps (adjustable gaps) between the stator and rotor. The ground material instantly enters the second layer of dispersing and homogenizing layer for shear dispersion and homogenization. In addition, it also has the following characteristics:

Taicang Xide High Shear Homogenizer

1. The equipment operates at a speed of up to 18000 revolutions per minute, which is 4-5 times faster than current ordinary equipment, efficiently refining and dispersing grinding materials

2. The gap between the stator and rotor is adjustable, and the grinding gap adjustment can be changed to suit specific processes

3. The colloid grinding head is equipped with three grinding zones, one for coarse grinding, two for fine grinding, and three for ultrafine grinding. By adjusting the gap between the stator and rotor, the desired ultrafine grinding effect can be effectively achieved (or processed in a cyclic manner).

Grinding and dispersing machine is a high-tech product composed of colloid grinding and dispersing machines.

The first level consists of three-level sawtooth protrusions and grooves with increasing precision. The stator can be infinitely adjusted to the desired distance between the rotors. Under enhanced fluid turbulence. The groove can change direction at each level.
The second stage is composed of a stator. The design of the dispersing head also effectively meets the needs of substances with different viscosities and particle sizes. The difference in the design of the stator and rotor (emulsifying head) between online and batch machines is mainly due to the requirements for conveying performance. It is particularly important to note that the difference between coarse precision, medium precision, fine precision, and other types of working heads is not only the arrangement of specified rotor teeth, but also an important difference in the geometric characteristics of different working heads. The width of the slot and other geometric features can alter the different functions of the stator and rotor working heads.

The following is a model table for reference:

Carbon nanotube conductive agent high shear homogenizer