A kind of lithium ion battery safety coating slurry and dispersion method thereof

A lithium-ion battery, coating slurry technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as long-term stable storage, reduced overall battery performance, and difficulty in drying out moisture. , to improve the overall performance of the battery, increase the suspension performance, and reduce the swelling phenomenon.

Active Publication Date: 2022-08-02
郑州中科新兴产业技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are disadvantages at the same time that the safety is improved: 1) When the ceramic coating uses water as a solvent, the moisture in the ceramic coating will penetrate into the pole piece, causing the pole piece to swell, causing the active material on the pole piece to peel off from the foil; 2 ) is when the ceramic coating uses a water-based binder. Since the ceramic material is nano-sized particles and has a high specific surface area, it is difficult to completely dry out the moisture during the baking process, resulting in a decrease in the overall performance of the battery.
The preparation method of the ceramic coating slurry includes: 9-15% adhesive and 80%-95% solvent, and a high-speed dispersion process; in this method, the content of ceramic material is slightly lower, and the content of binder is higher. Without dispersing aids, the suspension prepared by it has poor stability, and it is easy to cause phase separation of the suspension, so it cannot be stored stably for a long time

Method used

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  • A kind of lithium ion battery safety coating slurry and dispersion method thereof
  • A kind of lithium ion battery safety coating slurry and dispersion method thereof
  • A kind of lithium ion battery safety coating slurry and dispersion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The lithium-ion battery safety coating slurry of the present embodiment is composed of the following components in parts by mass:

[0033] Boehmite 90, polyvinylidene fluoride 10, alkoxyammonium salt of acid group block copolymer 0.1, N-methyl-2-pyrrolidone 140, the dispersion method of its uniform and stable suspension is as follows;

[0034] (1) Preparation of premixed glue: Sprinkle the polyvinylidene fluoride evenly into the weighed N-methyl-2-pyrrolidone, stir for 6 hours at 15 rpm and 1200 rpm in a sealed container, polyvinylidene fluoride Completely dissolved in N-methyl-2-pyrrolidone to obtain a premixed glue solution with a mass concentration of 10%;

[0035] (2) Preparation of anhydrous boehmite material: add the boehmite to the grinding jar, and the grinding time is 0.5h; the particle size D50 of the boehmite after grinding is 100-3000nm, and the ground boehmite is kept at -0.9~- Vacuum degree of 0.85MPa, keep high temperature at 150℃±5℃ and bake for 4h;

...

Embodiment 2

[0042] The difference between Example 2 and Example 1 is that the lithium-ion battery safety coating slurry of this example is composed of the following components in parts by mass: boehmite 90, polyvinylidene fluoride 10, acid group block Alkylhydroxyammonium salt of the copolymer 0.1, N-methyl-2-pyrrolidone 550; 15% N-methyl-2-pyrrolidone was added in step (5); other steps were the same as in Example 1.

Embodiment 3

[0050] The difference between Example 3 and Comparative Example 1 is to remedy the slurry with flocculation problems. The slurry in Comparative Example 1, which had been left standing for 10 days in a sealed state and had been phase-separated, was re-added with 1% of the acid group block copolymer. Alkylhydroxyammonium salts. First, stir and disperse for 4 hours according to the revolution of 25 rpm and the rotation of 3500 rpm; then transfer the mixture into the cone mill, and circulate 10 times at a flow rate of 10L / h and a linear speed of 23m / s;

[0051] From the solid content and viscosity change data of Examples 1-3 and Comparative Examples 1-3 figure 1 and figure 2 From the comparison, it can be seen that the solid content of the ceramic slurry prepared by the cycle of ultrasonic and magnetic stirring in Comparative Example 1 without wetting and dispersing agent in Comparative Example 2, magnetic stirring in Comparative Example 2, and magnetic stirring in Comparative E...

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Abstract

The invention discloses a lithium ion battery safety coating slurry and a dispersion method thereof. The lithium ion battery safety coating slurry comprises the following components in parts by weight: 87-95 parts of ceramic material, 5 parts of binder ~13 parts, low molecular weight ionic polymer wetting and dispersing agent 0.1~3.5 parts, solvent 140~550 parts. On the one hand, the safety coating slurry for lithium ion battery provided by the present invention has a high content of ceramic powder, and a little low molecular weight ionic polymer wetting and dispersing agent is introduced to improve the stability of the slurry; Form secondary agglomerates, and add dispersants containing certain groups in the invention to adjust the surface charge and surface acid-base adsorption of ceramic powders, improve the dispersion effect of powder particles, and obtain slurry with good dispersibility and stability . At the same time, the dispersion method provided can stabilize the viscosity of the ceramic slurry and reduce the time for optimizing the layering of the production process.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery safety coating slurry and a dispersion method thereof. Background technique [0002] With the advancement of lithium-ion battery technology, especially the market's expectations for large-scale equipment such as high-power, long-range electric vehicles, such as hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV), the battery energy is 5~20KWh , while a pure electric vehicle (EV) requires a battery capacity of 15~50KWh. Although battery life anxiety and energy replenishment anxiety have always been around new energy vehicles, battery safety has always been the focus of the whole society. In Shanghai alone, there have been more than 400 fire accidents caused by electric bicycle charging in 2020, resulting in 20 deaths and 17 injuries, arousing strong concern among consumers. The technology and measures to impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/62H01M10/42H01M10/0525B28C1/04
CPCH01M4/139H01M4/62H01M10/4235H01M10/0525B28C1/04Y02E60/10
Inventor 高桂红于天恒刘艳侠张若涛张治博赵冲冲
Owner 郑州中科新兴产业技术研究院
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