Mesoporous SiO2 microsphere lithium ion battery diaphragm and lithium ion battery

A mesoporous silica and ion battery technology, which is applied in secondary batteries, battery components, circuits, etc., can solve the problems of ceramic coatings with insufficient liquid absorption and liquid retention capabilities, and impacts on battery performance and cycle performance. Achieve the effects of safety performance and cycle performance improvement, large loading capacity, strong absorption and retention capacity

Active Publication Date: 2019-11-05
东莞市赛普克电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ceramic coating can improve the thermal stability of the separator to a certain extent, the liquid absorption and liquid retention capacity of the ceramic coating is not ideal, which will have a certain impact on the cycle performance of the battery performance.

Method used

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  • Mesoporous SiO2 microsphere lithium ion battery diaphragm and lithium ion battery
  • Mesoporous SiO2 microsphere lithium ion battery diaphragm and lithium ion battery
  • Mesoporous SiO2 microsphere lithium ion battery diaphragm and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of mesoporous silica microspheres:

[0028] Under rapid magnetic stirring, add 1.5g of cetyltrimethylammonium bromide (CTAB) to the mixture of 132mL of acetone, 36ml of deionized water, 1.5g of PVP and 2mol / L sodium hydroxide, and then quickly add 8ml For tetraethyl orthosilicate (TEOS), continue to keep stirring slowly, and the solution system becomes milky white turbid 15 minutes after the addition is completed, and the reaction solution is allowed to stand at 30°C for 2-3 hours. Thereafter, the reaction solution was centrifuged and ultrasonically dispersed and cleaned, and repeated several times to obtain a wet powder of silica microspheres, and then the powder was freeze-dried for 6 to 8 hours, and finally the dried powder was roasted in a high-temperature furnace at 550°C for 5 hours to remove CTAB template, the specific surface area is 420 ~ 430m 2 / g, the pore volume is 0.2~0.25cm 3 / g, mesoporous silica microspheres with a pore size of 1-4nm.

[0...

Embodiment 2

[0039] The difference with embodiment 1 is:

[0040] Preparation of diaphragm:

[0041] 1) First mix 30 parts of silica mesoporous microspheres, 10 parts of water-based binder, 1 part of dispersant, 1 part of thickener and 50 parts of water, ball mill, then add 8 parts of water-based binder, and continue ball milling Disperse to obtain silica mesoporous microsphere slurry;

[0042] 2) Using a PE microporous membrane with a porosity of 42% and a pore diameter of 0.5-1.5 μm as the diaphragm substrate, evenly coat the mesoporous silica microsphere slurry on the diaphragm substrate at a coating speed of 20 m / min and then baked at 60°C for 3 minutes to obtain a coating with a thickness of 1 μm and a surface density of 12 g / m 2 Li-ion battery separator with mesoporous silica microsphere layer.

[0043] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0045] The difference with embodiment 1 is:

[0046] Preparation of diaphragm:

[0047] 1) First mix 50 parts of silica mesoporous microspheres, 5 parts of water-based binder, 0.3 parts of dispersant, 0.2 parts of thickener and 40 parts of water, ball mill, then add 4.5 parts of water-based binder, continue ball milling Disperse to obtain silica mesoporous microsphere slurry;

[0048] 2) Using a PE microporous membrane with a porosity of 52% and a pore diameter of 0.5-1.5 μm as the diaphragm substrate, evenly coat the mesoporous silica microsphere slurry on the diaphragm substrate at a coating speed of 50 m / min and then baked at 80°C for 1 min to obtain a coating with a thickness of 3 μm and a surface density of 13 g / m 2 Li-ion battery separator with mesoporous silica microsphere layer.

[0049] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of a battery material, and particularly relates to a mesoporous SiO2 microsphere lithium ion battery diaphragm. The mesoporous SiO2 microsphere lithium ionbattery diaphragm comprises a diaphragm substrate and a mesoporous SiO2 microsphere layer, wherein the mesoporous SiO2 microsphere layer is coated on at least one surface of the diaphragm substrate and comprises a mesoporous SiO2 microsphere, a water-based binding agent, a dispersion agent, a thickening agent and water, and the mass of the mesoporous SiO2 microsphere accounts for 30%-50% of the total mass of the mesoporous SiO2 microsphere layer. Compared with the prior art, the lithium ion battery diaphragm has larger electrolyte loading quantity and has better wettability on the electrolyte. Moreover, the invention also provides a lithium ion battery comprising the mesoporous SiO2 microsphere lithium ion battery diaphragm, and the lithium ion battery has favorable safety and cycle properties.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a mesoporous silicon dioxide microsphere lithium-ion battery diaphragm and a lithium-ion battery. Background technique [0002] As a new star in the new energy industry, lithium-ion batteries have developed rapidly in recent years. Lithium-ion batteries mainly contain four major categories of materials: electrodes, electrolytes, separators, and packaging materials. Among them, due to the high technical requirements of the production process, the diaphragm has been monopolized by developed countries such as the United States and Japan in the early days. In recent years, the rapid development of China's new energy industry has spawned a large number of China's own diaphragm manufacturers, and their production capacity and quality are increasingly approaching international high-end manufacturers. [0003] At present, polyolefin materials such as polypropylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587H01M50/403H01M50/446H01M50/449Y02E60/10Y02P70/50
Inventor 许刚麦伟杰
Owner 东莞市赛普克电子科技有限公司
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