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Preparation method of modified aluminum oxide and PMMA mixed slurry coated diaphragm

A technology of mixing slurry and alumina, applied in the direction of structural parts, electrical components, battery pack parts, etc., can solve the problems of easy agglomeration, difficult to disperse, large particle interaction force, etc., to suppress agglomeration and prevent black spots. , the effect of reducing moisture

Active Publication Date: 2022-02-15
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the main materials used in ceramic coating are alumina, boehmite, magnesium hydroxide, silica, etc. Taking alumina as an example, it has a very high specific surface area, and the interaction force between particles is large, so it is easy to agglomerate , plus the characteristics of hydrophilic and oleophobic, it is not easy to disperse in the slurry, and black spots are formed on the surface of the diaphragm. Therefore, it is particularly important to invent a method for preparing a modified alumina and PMMA mixed slurry coated diaphragm

Method used

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  • Preparation method of modified aluminum oxide and PMMA mixed slurry coated diaphragm
  • Preparation method of modified aluminum oxide and PMMA mixed slurry coated diaphragm

Examples

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Embodiment 1

[0048] A method for preparing a modified alumina and PMMA mixed slurry coating diaphragm, the specific steps are as follows,

[0049] S1. Preparation of modified alumina:

[0050] (1) Take 8.5 parts of silane coupling agent KH-570, add 83 parts of 95% ethanol solution, stir, add a particle size of 300 nm, and a specific surface of 4 m 2 1.8 parts / g of alumina powder, heated and stirred at a temperature of 45°C, stirred at 500 r / min for 1 h to obtain a mixed solution;

[0051] (2) performing suction filtration on the mixed solution, and drying the modified alumina solid at 55° C. for 25 hours to obtain modified alumina powder particles;

[0052] S3. Preparation of slurry:

[0053] Take 24.3 parts of deionized water, add 32.1 parts of modified alumina powder, stir at 600r / min for 40min, add 8.76 parts of sodium carboxymethyl cellulose, stir at 650r / min for 60min, add polymethyl methacrylate and butylbenzene 34.6 parts of latex, stirred at 500r / min for 40min, added 0.24 part o...

Embodiment 2

[0057] A method for preparing a modified alumina and PMMA mixed slurry coating diaphragm, the specific steps are as follows,

[0058] S1. Preparation of modified alumina:

[0059] (1) Take 9.8 parts of silane coupling agent KH-570, add 88 parts of 95% ethanol solution, stir, add a particle size of 600 nm, and a specific surface of 5 m 2 2.1 parts / g of alumina powder, heated and stirred at a temperature of 50°C and stirred at 600r / min for 1.5h to obtain a mixed solution;

[0060] (2) performing suction filtration on the mixed solution, and drying the modified alumina solid at 61° C. for 27 hours to obtain modified alumina powder particles;

[0061] S3. Preparation of slurry:

[0062] Take 24.3 parts of deionized water, add 36.3 parts of modified alumina powder, stir at 600r / min for 40min, add 8.76 parts of sodium carboxymethyl cellulose, stir at 650r / min for 60min, add polymethyl methacrylate and butylbenzene 30.4 parts of latex, stirred at 500r / min for 40min, added 0.24 par...

Embodiment 3

[0066] A method for preparing a modified alumina and PMMA mixed slurry coating diaphragm, the specific steps are as follows,

[0067] S1. Preparation of modified alumina:

[0068] (1) Take 11.5 parts of silane coupling agent KH-570, add 90 parts of 95% ethanol solution, stir, add a particle size of 900 nm, and a specific surface of 7 m 2 / g alumina powder 2.4 parts, heating and stirring, temperature 60 ° C, stirring at 700 r / min for 2 h, to obtain a mixed solution;

[0069] (2) performing suction filtration on the mixed solution, and drying the modified alumina solid at 65° C. for 30 hours to obtain modified alumina powder particles;

[0070] S3. Preparation of slurry:

[0071] Take 24.3 parts of deionized water, add 42 parts of modified alumina powder, stir at 600r / min for 40min, add 8.76 parts of sodium carboxymethylcellulose, stir at 650r / min for 60min, add polymethyl methacrylate and butylbenzene 24.7 parts of latex, stirred at 450r / min for 40min, added 0.24 part of wet...

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Abstract

The invention discloses a preparation method of a modified aluminum oxide and PMMA mixed slurry coated diaphragm, which comprises the following steps: taking a silane coupling agent, adding an ethanol solution, adding aluminum oxide powder, heating and stirring to obtain a mixed solution; carrying out suction filtration and drying on the mixed solution to obtain modified aluminum oxide powder particles; adding the modified aluminum oxide powder into deionized water, adding a thickening agent, adding an adhesive and adding an auxiliary agent to obtain slurry; and coating a base membrane with the obtained slurry to obtain the diaphragm. The coupling agent is used for modifying aluminum oxide, a part of groups in molecules of the coupling agent can react with various functional groups on the surface of powder to form powerful chemical bonds, and the other part of groups can be physically wound in a slurry system, so that agglomeration of particles is inhibited, the coated diaphragm is not prone to generating black spots, the surface of the aluminum oxide is organized, the hydrophobic purpose is achieved, and the effect of reducing the moisture of a coating film is achieved.

Description

technical field [0001] The invention relates to the technical field of diaphragm preparation, in particular to a preparation method for a diaphragm coated with modified alumina and PMMA mixed slurry. Background technique [0002] At present, the commonly used lithium battery separators are polyolefin separators, such as PE, PP microporous films, non-woven fabrics, aramid fibers, etc. Taking PE separators as an example, the thermal stability is poor, and the batteries are easily shrunk due to heat during use, resulting in short-circuit explosions; and The common range of its porosity is between 38-47%, the pore size is between 30-45nm, the affinity for electrolyte is not good, and the amount of liquid absorbed by the diaphragm is not high; [0003] At present, the common treatment method for PE diaphragm is coating. Coating ceramic material solves the problem of poor thermal shrinkage of the base film, but the coating is easy to absorb water. At present, the moisture of the c...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/434
CPCH01M50/403H01M50/434Y02E60/10
Inventor 刘科张立斌陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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