Preparation device of carbon nanotube conductive agent screened by clamp

Abstract

The utility model discloses a device for preparing a carbon nano tube conductive agent through clamp screening, which comprises a stirrer, a stock bin, a high-speed homogenizing device, a sanding device, an ultrasonic device, a slurry screening device, a magnetic iron removal device and a slurry finished product collecting device, the stock bin is connected with the high-speed homogenizing device, and a discharge port of the high-speed homogenizing device is connected with a feed port of the sanding device; a discharging port of the sand milling device is connected with a feeding port of the slurry screening device, a discharging port of the slurry screening device is connected with the magnetic attraction iron removal device and the sand milling device, the magnetic attraction iron removal device is connected with the slurry finished product collecting device, the stirrer is placed in the stock bin, and a probe of the ultrasonic device is placed in the sand milling stock bin. And a slit channel is arranged in the slurry screening device for screening. The device is simple in structure, reasonable in design, convenient to operate and high in production efficiency, the prepared carbon nanotube conductive agent is good in dispersity and high in quality, the production quality and the safety performance of the finally produced battery are ensured, and the device has great production practice significance.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon nanotubes, in particular to a preparation device for a carbon nanotube conductive agent screened by clamps. Background Art

[0002] Carbon nanotubes (CNTs) are a newly emerging high-end conductive material. Their unique one-dimensional nanostructure possesses excellent mechanical, electrical, thermal, optical, and reaction properties. With the deepening of research on CNTs and nanomaterials in recent years, their broad application prospects have continued to emerge, such as in fuel cells, lithium-ion batteries, electromagnetic wave shielding materials, conductive resins, and other fields. Existing technical solutions for using CNTs as conductive agents include preparing a uniformly dispersed conductive slurry of CNTs, mixing this slurry with the positive / negative active materials and a binder to form a battery slurry, which is then coated onto the positive / negative current collectors. CNTs have a large aspect ratio and large specific surface area, allowing them to overlap with the surface of the active material particles, forming electron transport channels. In lithium-ion batteries, they not only act as "wires" in the conductive network, but also exhibit a double-layer effect, leveraging the high-rate characteristics of supercapacitors. Their excellent thermal conductivity also facilitates heat dissipation during battery charging and discharging, reducing battery polarization, improving the battery's high- and low-temperature performance, and extending the battery's life. However, carbon nanotubes are extremely difficult to disperse, and ferromagnetic metal impurities are easily generated and precipitated during the preparation and transportation process. Therefore, there is an urgent need to develop a technology that can continuously and reliably produce carbon nanotube conductive agents.

[0003] The Chinese utility model patent with patent number CN205583039U discloses a carbon nanotube composite conductive agent production device, including a dispersion device, a mixing device and a collection device, which are connected in sequence by pipelines. The dispersion device is provided with a feed port, and a gas injector is provided inside the dispersion device. The mixing device is provided with a liquid nitrogen injection port and a stirring device. The bottom of the collection device is provided with a heating plate, and a finished product collection box is provided inside the collection device. The finished product collection box is movably connected to the collection device. Although the device has a simple structure, the carbon nanotubes are not ground, but are only dispersed by gas. In addition, the slurry is not screened or impurity-removed before the finished product is collected, and the quality of the slurry cannot be guaranteed. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide a preparation device for carbon nanotube conductive agent by clamp screening, which has a simple structure, reasonable design, convenient operation, high production efficiency, and the prepared carbon nanotube conductive agent has good dispersion and high quality, ensuring the production quality and safety performance of the final produced battery, and has great production practical significance.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A device for preparing a carbon nanotube conductive agent for clamp screening comprises an agitator, a hopper, a high-speed homogenizer, a sand mill, an ultrasonic device, a slurry screening device, a magnetic iron removal device, and a slurry finished product collecting device. The hopper is connected to the high-speed homogenizer, the discharge port of the high-speed homogenizer is connected to the feed port of the sand mill, the discharge port of the sand mill is connected to the feed port of the slurry screening device, the discharge port of the slurry screening device is connected to the feed ports of the magnetic iron removal device and the sand mill, the discharge port of the magnetic iron removal device is connected to the slurry finished product collecting device, the agitator is placed in the hopper, the probe of the ultrasonic device is placed in the sand mill hopper, and a slit channel is provided in the slurry screening device for screening.

[0007] Furthermore, the agitator includes a stirring paddle, a rotating shaft, a bracket and a motor. One end of the rotating shaft is connected to the stirring paddle, and the other end is connected to the bracket. The bracket is equipped with a motor and a control page. The stirring paddle is arranged inside the silo device.

[0008] Furthermore, the high-speed homogenizer is used to disperse the carbon nanotubes at high speed during use, and plays a role of pre-dispersion in this device.

[0009] Furthermore, the ultrasonic device includes an ultrasonic probe, a connecting line and a motor, and the ultrasonic probe is placed inside the sanding device.

[0010] Furthermore, the slurry screening device includes a silo and a slit outlet, and is equipped with a stirring paddle in the silo to prevent sedimentation. In addition, the size of the slit is selected to be 100 nanometers.

[0011] Furthermore, the magnetic iron removal device is provided with a magnetic rod, and the magnetic rod is connected to an external motor through a rotating shaft, and is driven by the motor to rotate and stir.

[0012] Furthermore, the feed port of the magnetic iron removal device is at the bottom and the discharge port is at the top.

[0013] Furthermore, valves are provided at the outlets of the silo, high-speed homogenizing device, sand mill, slurry screening device, magnetic iron removal device, and slurry finished product collecting device, among which the valve at the outlet of the slurry screening device is a three-way valve.

[0014] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0015] 1. The new device for preparing carbon nanotube conductive agent by clamp screening provided in this experiment has a simple structure, reasonable design, convenient operation, high production efficiency, and the prepared carbon nanotube conductive agent has good dispersion and high quality, ensuring the production quality and safety performance of the final battery produced, and has important production practice significance.

[0016] 2. The new preparation device of the carbon nanotube conductive agent with clip screening provided in this experiment includes three dispersion methods: homogenization, sand milling and ultrasound. The carbon nanotubes are pre-dispersed by high-speed homogenization, and then ultrasound and sand milling are applied to the carbon nanotubes at the same time, which speeds up the production efficiency and obtains high-quality carbon nanotube conductive agent.

[0017] 3. The new clamp-screened carbon nanotube conductive agent preparation device provided in this experiment includes a slurry screening device that allows production personnel to make a preliminary assessment of the quality of the slurry. It and the sand mill device can achieve a cyclic operation and can repeatedly disperse the carbon nanotubes to achieve the required particle size.

[0018] 4. The new device for preparing the carbon nanotube conductive agent with clip screening provided in this experiment and the magnetic iron remover can quickly and efficiently remove the ferromagnetic substances in the carbon nanotube slurry during the preparation process, thereby reducing the impact of the slurry in subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the device for preparing the carbon nanotube conductive agent by clip screening according to the present invention;

[0020] In the figure, 1- agitator, 2- silo, 3- high-speed homogenizer, 4- sand mill, 5- ultrasonic device, 6- slurry screening device, 7- agitator, 8- magnetic iron removal device, 9- finished product collection device, 10- motor. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of this application.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1: Figure 1As shown, a preparation device for a carbon nanotube conductive agent with clamp screening in this embodiment includes an agitator, a hopper, a high-speed homogenizer, a sand mill, an ultrasonic device, a slurry screening device, a magnetic iron removal device, and a slurry finished product collecting device. The hopper is connected to the high-speed homogenizer, the discharge port of the high-speed homogenizer is connected to the feed port of the sand mill, the discharge port of the sand mill is connected to the feed port of the slurry screening device, the discharge port of the slurry screening device is connected to the feed port of the magnetic iron removal device and the feed port of the sand mill, the discharge port of the magnetic iron removal device is connected to the slurry finished product collecting device, the agitator is placed inside the hopper, the probe of the ultrasonic device is placed in the sand mill hopper, and the slurry screening device is provided with a slit channel for screening.

[0024] The mixture of carbon nanotubes, dispersant and water is stirred and mixed in the silo 2 and then enters the homogenizer 3 for high-speed homogenization to pre-disperse the carbon nanotubes. The mixture then enters the sand mill 4 for grinding. While grinding, the ultrasound 5 is turned on, and the two work together to disperse the carbon nanotubes and speed up the dispersion efficiency. After grinding, the mixture enters the screening device 6 to screen the slurry that meets the particle size. However, since the solid content will change after screening, it can be repeatedly ground to make the slurry particle size meet the requirements as much as possible. The mixture then enters the magnetic iron removal device 8 for impurity removal and finally enters the finished product collection device 9.

[0025] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A device for preparing a carbon nanotube conductive agent by clip screening, characterized in that: The invention comprises an agitator (1), a silo (2), a high-speed homogenizing device (3), a sand milling device (4), an ultrasonic device (5), a slurry screening device (6), a magnetic iron removal device (8), and a slurry finished product collecting device (9). The silo is connected to the high-speed homogenizing device, the discharge port of the high-speed homogenizing device is connected to the feed port of the sand milling device, the discharge port of the sand milling device is connected to the feed port of the slurry screening device, the discharge port of the slurry screening device is connected to the feed port of the magnetic iron removal device and the feed port of the sand milling device, the discharge port of the magnetic iron removal device is connected to the slurry finished product collecting device, the agitator is placed in the silo, the probe of the ultrasonic device is placed in the sand milling silo, and a slit channel is provided in the slurry screening device for screening.

2. The device for preparing a carbon nanotube conductive agent by clip screening according to claim 1, characterized in that: The agitator includes a stirring paddle, a rotating shaft, a bracket and a motor. One end of the rotating shaft is connected to the stirring paddle, and the other end is connected to the bracket. The bracket is equipped with a motor and a control page. The stirring paddle is arranged inside the silo device.

3. The device for preparing a carbon nanotube conductive agent by clamp screening according to claim 1, characterized in that: The ultrasonic device comprises an ultrasonic probe, a connecting line and a motor, and the ultrasonic probe is placed inside the sanding device.

4. The device for preparing a carbon nanotube conductive agent by clamp screening according to claim 1, characterized in that: The slurry screening device comprises a silo and a slit outlet, and a stirring paddle is provided in the silo.

5. The device for preparing a carbon nanotube conductive agent by clamp screening according to claim 1, characterized in that: The carbon nanotube conductive agent will be divided into two parts at the screening device. According to needs, these two parts of slurry can be recycled and re-entered into the sand mill for sanding.

6. The device for preparing a carbon nanotube conductive agent by clip screening according to claim 1, characterized in that: The magnetic iron removal device is provided with a magnetic rod, and the magnetic rod is connected to an external motor through a rotating shaft and is driven by the motor to rotate and stir.

7. The device for preparing a carbon nanotube conductive agent by clamp screening according to claim 1, characterized in that: The feed port of the magnetic iron removal device is at the bottom and the discharge port is at the top.

8. The device for preparing a carbon nanotube conductive agent by clamp screening according to claim 1, characterized in that: Valves are provided at the discharge ports of the silo, high-speed homogenizing device, sand milling device, slurry screening device, magnetic iron removal device and slurry finished product collecting device.

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