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Efficient dispersion equipment and process for premixing and kneading lithium battery slurry

A lithium battery and premixing technology, which is applied in the direction of mixers, fluid mixers, mixers with rotating stirring devices, etc., can solve the problems of slurry dispersion uniformity and stability, and avoid equipment loss and speed up , improve efficiency, and avoid the effect of uneven slurry mixing

Pending Publication Date: 2020-05-08
江西安驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the dispersion uniformity and stability of the slurry obtained by the process stirring of the invention are not good enough

Method used

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  • Efficient dispersion equipment and process for premixing and kneading lithium battery slurry
  • Efficient dispersion equipment and process for premixing and kneading lithium battery slurry
  • Efficient dispersion equipment and process for premixing and kneading lithium battery slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a. The active material LFP powder (lithium iron phosphate), the conductive agent SP (carbon black) and the binder PVDF are transported to the special high-speed mixing equipment 1 through the central control device at a ratio of 90:1:2 for pre-mixing and kneading for 10 minutes. Be 1090rpm, make premixed powder;

[0034] b. Premix the conductive base material 5% CNT slurry and NMP in the solvent metering tank 2 at a ratio of 1:80, the rotation speed is 2500rpm, and the pump speed is 50L / min to prepare a premixed solvent, and the premixed solvent will be prepared Stored in the circulation tank 4, after the production starts, the premixed solvent and the premixed powder are delivered to the premixed disperser together;

[0035] c. Fully premix and disperse the premixed powder and premixed solvent in a premixed disperser with a rotation speed of 2000rpm and a pump speed of 50L / min to prepare a premixed slurry, and transport the premixed slurry to the circulation tank 3 In...

Embodiment 2

[0039] a. The active material graphite, the conductive agent SP and the binder CMC are transported to the special high-speed mixing equipment 1 through the central control device at a ratio of 96:2:0.6 for pre-mixing and kneading. The pre-mixing is performed for 10 minutes at a speed of 1090rpm to obtain a pre-mixed Powder;

[0040] b. Premix the binder material SBR (styrene-butadiene latex with a solid content of 50%) in the solvent metering tank 6, the rotating speed is 3000rpm, and the pump speed is 50L / min to prepare the premixed solvent and prepare the premixed solvent Stored in the circulation tank 4, after the production starts, the premixed solvent and the premixed powder are delivered to the premixed disperser together;

[0041] c. Fully premix and disperse the premixed powder and premixed solvent in a premixed disperser with a rotation speed of 3000rpm and a pump speed of 50L / min to prepare a premixed slurry, and transport the premixed slurry to the circulation tank ...

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Abstract

The invention discloses efficient dispersion equipment for premixing and kneading lithium battery slurry and a process. The equipment comprises special high-speed mixing equipment, a premixing disperser, circulating tanks, a stirrer, a solvent metering tank and a discharging tank. The process is as follows: premixing and kneading a binder, a solvent and conductive agent powder in the special high-speed mixing equipment to obtain first premixed slurry; mixing a conductive base material in the solvent metering tank to obtain second premixed slurry; conveying the first premixed slurry and the second premixed slurry into the premixing disperser through a pipeline at the same time, then conveying the mixed slurry obtained by dispersion into the circulating tank, returning the mixed slurry intothe premixing disperser through the pipeline to be continuously dispersed if the circulating tank is filled with the mixed slurry, and conveying the mixed slurry into the stirrer to be continuously stirred and discharged until the two circulating tanks are filled with the mixed slurry. The problem of powder wetting before dry mixing of the lithium battery slurry can be solved, and the stirring production efficiency is improved. The premixed and kneaded slurry is excellent in dispersion effect, the granularity of the slurry is improved, and uniform dispersion is ensured. The circulating devicecan continuously disperse, so that the production efficiency is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a lithium battery slurry premixing kneading high-efficiency dispersion equipment and process, belonging to the field of lithium ion battery manufacturing. Background technique [0002] Among the commercialized rechargeable batteries, lithium-ion batteries have the highest specific energy and can realize the thinning of rechargeable batteries. Known as "the battery of the 21st century", it will open up a new era of batteries, and the development prospect is very optimistic. In the electrode manufacturing of lithium-ion batteries, the positive electrode slurry is composed of binder, conductive agent, positive electrode material, etc.; the negative electrode slurry is composed of binder, graphite carbon powder, etc. With the continuous progress of lithium-ion battery materials, the particle size of raw materials is getting smaller and smaller, which not only improves the performance of lithium-ion batteries, but also easily forms ...

Claims

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Application Information

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IPC IPC(8): B01F13/10B01F7/24B01F7/18B01F5/10
CPCB01F25/52B01F27/92B01F27/90B01F33/82
Inventor 白科凌建军陈富源
Owner 江西安驰新能源科技有限公司
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