High-efficiency preparation method of lithium ion battery slurry

A lithium-ion battery and preparation process technology, applied in the field of lithium-ion batteries, can solve the problems of long time for preparing slurry, high vacuum stirring cost, short stirring time, etc., and achieve the effects of shortening dissolution time, avoiding high cost and accelerating dispersion.

Active Publication Date: 2018-11-30
北京英耐时新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the disadvantages of long slurry preparation time, high vacuum stirring cost and high energy consumption in the prior art, and provide a preparation

Method used

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  • High-efficiency preparation method of lithium ion battery slurry
  • High-efficiency preparation method of lithium ion battery slurry
  • High-efficiency preparation method of lithium ion battery slurry

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1:

[0017] This embodiment is used to illustrate the preparation method of the high-efficiency lithium ion battery slurry provided by the present invention.

[0018] A V-type mixer was used to dry-mix the positive electrode active material NCM111 (D50=8μm), the binder PVDF, and the conductive agent HS100 in a mass percentage of 95%: 3%: 2% dry powder. The dry-mixed powder is added to the solvent under stirring by shaking, the solvent temperature is 60℃, the revolution speed of the stirring is 18rmp, the high-speed dispersion speed is 500rmp, and the method of stirring for 6min and shaking is added to the solvent under stirring. The original design, the experiment found that it can shorten the mixing time, without vacuum degassing, greatly reducing the process, saving time and cost.

[0019] The temperature of the stirring tank is maintained at 60±5°C, the solid content of the powder added to the solvent in the first step is 68%, the revolution speed is 35 rpm, and th...

Example Embodiment

[0025] Example 2:

[0026] A V-type mixer was used to dry-mix the negative active material graphite (D50=9 μm), the binder CMC, and the conductive agent SPC in a mass percentage of 96%: 2%: 2% dry powder. The dry-mixed powder is added to the solvent under stirring by shaking, the solvent temperature is 55°C, the stirring revolution speed is 17 rpm, the high-speed dispersion speed is 450 rpm, and the stirring is 8 min.

[0027] The temperature of the stirring tank is maintained at 55±5°C, the solid content of the powder added to the solvent in the first step is 67%, the revolution speed is 37 rpm, and the high-speed dispersion speed is 1600 rpm. Stir for 8 minutes. In the second step, the solvent was added to a solid content of 65%, the revolution speed was 37 rpm, and the high-speed dispersion speed was 1600 rpm, and stirring was performed for 8 minutes. In the third step, the solvent was added to the solid content of 63%, the revolution speed was 37 rpm, and the high-speed disper...

Example Embodiment

[0030] Example 3:

[0031] A V-type mixer was used to dry-mix the positive electrode active material NCM111 (D50=6μm), the binder PVDF, and the conductive agent HS100 in a mass percentage of 94%: 3%: 3% dry powder. The dry-mixed powder is directly added to the solvent, the solvent temperature is 58 ℃, the stirring revolution speed is 16 rpm, the high-speed dispersion speed is 700 rpm, and the stirring is 8 min.

[0032] The temperature of the stirring tank is maintained at 58±5°C, the solid content of the powder added to the solvent in the first step is 67%, the revolution speed is 38 rpm, and the high-speed dispersion speed is 1600 rpm, stirring for 9 min. In the second step, the solvent was added to a solid content of 65%, the revolution speed was 38 rpm, and the high-speed dispersion speed was 1600 rpm, and stirring was performed for 9 minutes. In the third step, the solvent was added to the solid content of 63%, the revolution speed was 38 rpm, and the high-speed dispersion sp...

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Abstract

The invention discloses a high-efficiency preparation method of lithium ion battery slurry. The high-efficiency preparation method of positive electrode slurry and negative electrode slurry of a lithium ion battery comprises: dry-mixing active materials, a binder and a conductive agent, gradually adding the dry mixed powder into a solvent in a stirring state through an oscillation method, and carrying out stirring under the conditions of a certain temperature, revolution and high-speed dispersion without vacuuming conditions to obtain slurry for coating. Through the preparation method, powderis uniformly and rapidly wetted so that stirring time is significantly shortened to only 1h, the production efficiency is significantly improved, the equipment energy consumption and equipment dependency are reduced and the labor cost is saved. The slurry has good consistency and stability. The prepared battery has good electrochemical performances. The method has high efficiency and is especiallysuitable for mass production.

Description

technical field [0001] The invention relates to a high-efficiency preparation process of lithium-ion battery slurry, which belongs to the technical field of lithium-ion batteries. Background technique [0002] With the development of science and technology and the improvement of living standards, human beings have an increasing demand for multifunctional portable electronic devices and electric vehicles. Therefore, research on high energy density, good load characteristics, fast charging and discharging, high safety performance, long cycle life, Low-cost new lithium-ion batteries have become an important frontier field in the world. [0003] Slurry preparation is one of the important factors affecting the capacity and electrochemical performance of Li-ion batteries. There are many slurry preparation methods at present, but there is a common problem of long preparation time. Generally, the stirring time is not less than 4 hours. Long-term stirring not only consumes a lot of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/587H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 李文迪石磊石岩上野太郎丁莹
Owner 北京英耐时新能源科技有限公司
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