High-speed dispersion equipment, slurry, battery pole pieces and lithium-ion batteries

A high-speed dispersion and equipment technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited dispersion capacity of equipment, short slurry residence time, weak shearing effect of dispersion wheels, etc., to reduce agglomeration phenomenon, Effect of improving dispersing ability and inhibiting agglomeration phenomenon

Active Publication Date: 2018-02-16
DALIAN CBAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] First of all, the degree of dispersion of the slurry is directly limited by the residence time of the slurry in the dispersion equipment. However, due to the design of the internal structure of the existing dispersion tank, after the slurry directly collides with the inner wall of the dispersion tank through the dispersion wheel, it may come out When the feed port flows out, the residence time of the slurry in the dispersion barrel is generally short, so the degree of dispersion is relatively poor due to the limitation of the residence time.
[0012] In addition, although it utilizes the shearing effect generated by the particles in the slurry and the micropores in the dispersion wheel and the flow rate difference between the liquid flows, it also cooperates with the relative motion between the particles in the slurry. Friction and the impact between the slurry particles and the container wall further disperse the pre-mixed slurry. However, the shearing effect of the dispersion wheel on the slurry is still weak, and the dispersion ability of the equipment is affected by the Shear constraints are also limited

Method used

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  • High-speed dispersion equipment, slurry, battery pole pieces and lithium-ion batteries
  • High-speed dispersion equipment, slurry, battery pole pieces and lithium-ion batteries
  • High-speed dispersion equipment, slurry, battery pole pieces and lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The inner surface of the side wall of the dispersing barrel is designed to have a spiral track structure, and at the same time ensure that the spiral track structure is: when viewed from the upper end of the dispersing barrel, it climbs up in the counterclockwise direction and the spiral track inwards toward the center of the dispersing barrel . The dispersing wheel is designed to have a tooth-like appearance structure, the tooth-like appearance is distributed on the outer surface of the cylinder of the dispersing wheel and faces the inner wall of the dispersing barrel, and it has an open-pore appearance structure. The opening on the dispersing wheel adopts the appearance of a frustum structure, and its lower bottom surface, that is, the larger bottom surface faces inward to the center of the dispersing wheel (that is, it is set on the inner surface of the cylinder), and the upper bottom surface, that is, the smaller bottom surface faces outward. The structure of the in...

Embodiment 2

[0054] Compared with Example 1, the high-speed dispersing equipment used in this embodiment cancels the tooth-like appearance of the dispersing wheel and adopts a smooth appearance, and at the same time, the opening treatment is carried out on the dispersing wheel, wherein the opening is a cylindrical through hole. The test slurry uses nickel-cobalt lithium manganese oxide as the active material and supplemented by PVDF as the binder, CNT as the conductive material, and NMP as the solvent. Hours of pre-mixing by traditional "planetary-dispersing" mixing equipment, and then dispersing by the high-speed dispersing equipment of this embodiment, and the slurry prepared by this preparation process is designated as slurry A2.

[0055] The above-mentioned slurry is coated on the aluminum foil according to the normal process, and prepared into pole pieces through rolling and cutting processes. After a series of subsequent processes, the finished 18650 battery is finally made.

Embodiment 3

[0057] Compared with Example 1, the high-speed dispersing equipment used in this embodiment cancels the spiral track structure set on the inner wall of the dispersing barrel and chooses a smooth inner wall, and at the same time, the opening treatment is carried out on the dispersing wheel, wherein the opening is a cylindrical through hole . The test slurry uses nickel-cobalt lithium manganese oxide as the active material and supplemented by PVDF as the binder, CNT as the conductive material, and NMP as the solvent. Hours of pre-mixing by traditional "planetary-dispersing" mixing equipment, and then dispersing by the high-speed dispersing equipment of this embodiment, and the slurry prepared by this preparation process is designated as slurry A3.

[0058]The above-mentioned slurry is coated on the aluminum foil according to the normal process, and prepared into pole pieces through rolling and cutting processes. After a series of subsequent processes, the finished 18650 battery ...

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Abstract

The invention belongs to the technical field of slurry preparation and battery preparation, and in particular relates to a high-speed dispersion device, a slurry, a battery pole piece, and a lithium ion battery. Among them, the high-speed dispersion equipment includes a coaxially arranged dispersing barrel and a dispersing wheel, and the dispersing wheel is located in the dispersing barrel; the dispersing barrel includes a side wall with a spiral track, and the spiral track is located on the inner surface of the side wall; the dispersing wheel includes a cylinder and an opening , the outer surface of the cylinder wall of the cylinder has a plurality of protrusions with a tooth-like structure, and the opening adopts a frustum structure and is arranged on the cylinder wall. This design can effectively improve the equipment's ability to disperse the slurry. The dispersion of the internal substances of the slurry prepared by the equipment will be more uniform, and the agglomeration phenomenon among the active substances will be obviously reduced. The impedance of the battery pole piece prepared by using the above slurry is smaller, and the electrical performance of the lithium ion battery prepared by using the above slurry or the battery pole piece is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of slurry preparation and battery preparation, and in particular relates to a high-speed dispersion device, a slurry, a battery pole piece and a lithium ion battery. Background technique [0002] Lithium-ion batteries have gained popularity in modern society because of their advantages such as high voltage, large specific energy, long cycle life, good safety performance, low self-discharge rate, no memory effect, wide operating temperature and a certain degree of fast charge and discharge capabilities. Wide range of applications. The existing industrial production process of lithium-ion batteries is usually: pulping, coating, assembly and chemical formation. Among them, the quality of the pulping process directly affects the performance of the positive and negative electrode materials, which in turn determines the performance and quality of the finished battery. The standard to measure the quality of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F9/18H01M4/505H01M4/525H01M4/131H01M10/0525B01F29/86
CPCY02E60/10
Inventor 胡景博田秀君张亮郭佳曹启飞戴华斌肖静
Owner DALIAN CBAK POWER BATTERY CO LTD
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