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Barium sulfate diaphragm and preparation method thereof

A technology of barium sulfate and diaphragm, which is applied in the field of barium sulfate diaphragm and its preparation, and can solve the problems of poor adhesion between barium sulfate and the diaphragm surface, decreased air permeability of the diaphragm, and easy powder drop of the barium sulfate layer.

Active Publication Date: 2021-02-09
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors found that in CN201310518815.4, barium sulfate coats the diaphragm. In the example described above, the particle size of barium sulfate is 0.1-0.25 μm. Barium sulfate is mixed with glue or additives, and coated on the surface of the diaphragm to form a dense coating. As a result, the gas permeability of the separator decreases sharply, which leads to lithium precipitation or lithium dendrite formation during battery cycling.
In addition, the adhesion of barium sulfate to the surface of the separator is not good, resulting in easy powder loss of the barium sulfate layer

Method used

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  • Barium sulfate diaphragm and preparation method thereof
  • Barium sulfate diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Preparation of coupling agent modified barium sulfate

[0056] 50 parts of 20nm barium sulfate, 6 parts of sodium chloride, 80 parts of DI water, and 50 parts of ethanol were mixed and stirred at 60° C. for 0.5 h at 1000 rpm to prepare a barium sulfate suspension with a solid content of 30 wt %;

[0057] Add 0.5 parts of titanate coupling agent to the barium sulfate suspension, use a high-speed shear emulsifier, shear and emulsify at 8000rpm / min for 20min to modify the nano-barium sulfate, and then filter, wash, dry, and airflow crush The coupling agent modified barium sulfate powder is obtained.

[0058] After testing, the average particle size of the modified barium sulfate powder is 20nm

[0059] (2) Preparation of barium sulfate slurry

[0060] Mix 8 parts of acrylic acid, 0.5 parts of sodium polyacrylate, and 800 parts of DI water, and stir at 30°C for 20 minutes at 500 rpm / min; then add 80 parts of coupling agent-modified barium sulfate, and stir for 1.5 hou...

Embodiment 2

[0064] (1) Preparation of coupling agent modified barium sulfate

[0065] 60 parts of 20nm barium sulfate, 6 parts of sodium chloride, 50 parts of DI water, and 50 parts of ethanol were mixed and stirred at 65° C. for 0.5 h at 1000 rpm to prepare a barium sulfate suspension with a solid content of 40 wt %;

[0066] Add 1 part of titanate coupling agent to the barium sulfate suspension, use a high-speed shear emulsifier, shear and emulsify at 8000rpm / min for 20min to modify the nano-barium sulfate, and then filter, wash, dry, and airflow crush The coupling agent modified barium sulfate powder is obtained.

[0067] After testing, the average particle diameter of the obtained modified barium sulfate powder is 25nm

[0068] (2) Preparation of barium sulfate slurry

[0069] Mix 10 parts of methacrylic acid, 1 part of polyethylene glycol ether, and 1500 parts of DI water, stir at 30°C for 20 minutes at 500 rpm / min; then add 85 parts of coupling agent-modified barium sulfate, and s...

Embodiment 3

[0073] (1) Preparation of coupling agent modified barium sulfate

[0074] 75 parts of 15nm barium sulfate, 8 parts of sodium chloride, 50 parts of DI water, and 50 parts of ethanol were mixed and stirred at 70° C. for 0.5 h at 1000 rpm to prepare a barium sulfate suspension with a solid content of 45 wt %;

[0075] Add 2 parts of aluminate coupling agent to the barium sulfate suspension, use a high-speed shear emulsifier, shear and emulsify at 10000rpm / min for 20min to modify the nano-barium sulfate, and then filter, wash, dry, and airflow crush The coupling agent modified barium sulfate powder is obtained.

[0076] After testing, the average particle diameter of the obtained modified barium sulfate powder is 25nm

[0077] (2) Preparation of barium sulfate slurry

[0078] Mix 10 parts of methyl acrylate, 1 part of sodium polyacrylate, and 1500 parts of DI water, stir at 30°C for 20 minutes at 500 rpm / min; then add 85 parts of coupling agent-modified barium sulfate, and stir ...

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Abstract

The invention relates to a barium sulfate diaphragm and a preparation method thereof. The barium sulfate diaphragm comprises a base membrane; and a modified barium sulfatemicro-layer arranged on at least one surface of the base membrane, wherein the modified barium sulfate is coupling agent modified barium sulfate, and the surface of the base membrane is covalently connected with the modified barium sulfate micro-layer. According to the barium sulfate diaphragm disclosed by the invention, the thickness is not obviously increased, and the air permeability is basically kept unchanged, and meanwhile, the barium sulfate diaphragm has improved thermal shrinkage and wetting properties, so that the safety of a lithium battery in application is improved.

Description

technical field [0001] The invention belongs to the technical field of diaphragms, and relates to a barium sulfate diaphragm and a preparation method thereof. Background technique [0002] As a new type of high-energy chemical power source, lithium-ion batteries, under the conditions of high temperature or high-efficiency charging and discharging, the thermal effect of the battery system will cause heat accumulation inside the battery, which can easily cause combustion and explosion of lithium batteries. Therefore, the safety of lithium batteries is the primary consideration. At the same time, in the field of new energy vehicles, the demand for lithium-ion batteries is increasing year by year, and the demand for large-capacity and high-power batteries is imminent. It is very urgent to develop lithium-ion batteries with high safety and good cycle performance / conductivity. [0003] CN201310518815.4 discloses a lithium-ion battery barium sulfate diaphragm and a preparation met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/431H01M50/449H01M50/451H01M50/403H01M10/052H01M10/0525
CPCH01M10/052H01M10/0525Y02E60/10
Inventor 周素霞王晓明刘勇标黄云王婷
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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