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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 of high-efficiency lithium-ion battery slurry with short stirring time and no need for vacuum stirring Process, the consistency and stability of the slurry are good, and the electrochemical performance of the battery is good

Method used

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

Examples

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Effect test

Embodiment 1

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

[0018] The positive electrode active material NCM111 (D50=8 μm), the binder PVDF, and the conductive agent HS100 were dry-mixed in a mass percentage of 95%:3%:2% by using a V-type mixer. The powder after dry mixing is added into the solvent under stirring by means of oscillation, the solvent temperature is 60°C, the revolution speed of stirring is 18rmp, the high-speed dispersion speed is 500rmp, and the way of adding into the solvent under stirring by stirring for 6min is as follows: The original design, the test found that it can shorten the stirring time and at the same time, it does not need vacuum defoaming, which greatly reduces the process, saves time and cost.

[0019] The temperature of the stirred tank is kept at 60±5°C, the solid content of the powder in the first step is 68% after being added to the solvent, the rev...

Embodiment 2

[0026] The graphite (D50=9 μm) negative electrode active material, the binder CMC, and the conductive agent SPC were dry-mixed in a mass percentage of 96%:2%:2% dry powder using a V-type blender. The powder after dry mixing was added into the solvent under stirring by means of vibration, the temperature of the solvent was 55°C, the revolution speed of stirring was 17 rpm, the high speed dispersion speed was 450 rpm, and the stirring was carried out for 8 minutes.

[0027] The temperature of the stirred tank is kept at 55±5°C, the solid content of the powder in the first step is 67% after being added to the solvent, the revolution speed is 37rmp, and the high-speed dispersion speed is 1600rmp, stirring for 8min. In the second step, a solvent is added until the solid content is 65%, the revolution speed is 37 rpm, and the high-speed dispersion speed is 1600 rpm, and the mixture is stirred for 8 minutes. In the third step, a solvent is added until the solid content is 63%, the re...

Embodiment 3

[0031] The positive electrode active material NCM111 (D50=6 μm), the binder PVDF, and the conductive agent HS100 were dry mixed in a mass percentage of 94%:3%:3% by using a V-type mixer. The powder after dry mixing was directly added into the solvent, the temperature of the solvent was 58°C, the stirring revolution speed was 16rmp, the high speed dispersion speed was 700rmp, and the stirring was carried out for 8 minutes.

[0032]The temperature of the stirred tank is kept at 58±5°C, the solid content of the powder in the first step is 67% after being added to the solvent, the revolution speed is 38rmp, and the high-speed dispersion speed is 1600rmp, stirring for 9min. In the second step, a solvent is added until the solid content is 65%, under the conditions of a revolution speed of 38 rpm and a high-speed dispersion speed of 1600 rpm, and stirring for 9 minutes. In the third step, a solvent is added until the solid content is 63%, under the conditions of a revolution speed o...

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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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