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High-safety diaphragm material and its preparation method and application

A high-safety, diaphragm material technology, applied in structural parts, electrical components, battery pack parts, etc., can solve problems such as battery performance degradation, improve heat resistance, improve ion transport characteristics, and improve anti-overcharge performance effect

Active Publication Date: 2021-09-07
力源(广州)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that its actual function only needs to be performed on the ion conduction channel inside the battery. When it is used as an additive and randomly distributed in the battery with the electrolyte, it may cause a decline in battery performance.

Method used

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  • High-safety diaphragm material and its preparation method and application
  • High-safety diaphragm material and its preparation method and application
  • High-safety diaphragm material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. Immerse the polyethylene microporous diaphragm in absolute ethanol, clean it under ultrasonic conditions for 30 minutes, take out the microporous diaphragm, rinse it with absolute ethanol three times, and dry it under vacuum at 60°C for later use. The pretreated PE microporous diaphragm is placed in the reaction chamber of the atomic layer deposition equipment, the chamber is closed, and the reaction chamber is cleaned with high-purity nitrogen with a purity of 99.999%. Use a vacuum pump to pump the reaction chamber to a low vacuum of 10hPa and heat it to 120°C. Under the condition of a carrier gas flow rate of 2ml / min, pass trimethylaluminum into the reaction chamber for 0.1s, and clean it with high-purity nitrogen for 10s to remove excess Trimethylaluminum, then pass in water vapor for 0.2s to hydrolyze the trimethylaluminum, and finally wash with high-purity nitrogen for 20s to remove unreacted water vapor. Repeatedly completing 50 deposition cycles in th...

Embodiment 2

[0032] Example 2. Immerse the microporous non-woven diaphragm of vinylidene fluoride-hexafluoropropylene copolymer in absolute ethanol, clean it under ultrasonic conditions for 30 minutes, take out the microporous diaphragm, rinse it with absolute ethanol three times, and dry it under vacuum at 60°C spare. The pretreated PVDF microporous non-woven diaphragm is placed in the reaction chamber of the atomic layer deposition equipment, the chamber is closed, and the reaction chamber is cleaned with high-purity nitrogen with a purity of 99.999%. Evacuate the reaction chamber to a low vacuum of 20hPa with a vacuum pump and heat it to 140°C. Under the condition of a carrier gas flow rate of 1ml / min, pass aluminum triisopropoxide into the reaction chamber for 0.5s, and clean it with high-purity nitrogen for 5s to remove The excess aluminum triisopropoxide is then fed with water vapor for 1 second to hydrolyze the aluminum triisopropoxide, and finally cleaned with high-purity nitrogen...

Embodiment 3

[0036] Example 3. Immerse the PE / PP / PE three-layer microporous diaphragm in absolute ethanol, clean it under ultrasonic conditions for 30 minutes, take out the microporous diaphragm, rinse it with absolute ethanol three times, and dry it under vacuum at 60°C for later use. Place the pretreated PE / PP / PE microporous diaphragm in the reaction chamber of the atomic layer deposition equipment, close the chamber, and then clean the reaction chamber with high-purity nitrogen with a purity of 99.999%. Use a vacuum pump to pump the reaction chamber to a low vacuum of 10hPa and heat it to 100°C. Under the condition of a carrier gas flow rate of 5ml / min, pass tetraethyl titanate into the reaction chamber for 0.1s, and clean it with high-purity nitrogen for 5s to remove The excess tetraethyl titanate was then fed with water vapor for 0.2s to hydrolyze the tetraethyl titanate, and finally cleaned with high-purity nitrogen for 10s to remove unreacted water vapor. In this way, 100 depositio...

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PUM

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Abstract

The present invention is mainly applied in the battery field, and specifically relates to a high-safety battery separator and a preparation method thereof. More specifically, the present invention relates to depositing a layer of inorganic The preparation method of a high-safety battery diaphragm formed by grafting a voltage-sensitive organic monomer on the surface of an inorganic oxide through surface modification. The present invention also relates to a high-safety battery diaphragm obtained by the above method and its application in lithium Application of chemical power systems such as batteries. The high-safety diaphragm of the present invention not only has high high-temperature dimensional stability, but also has the function of preventing battery overcharging, has good ion conductivity, and can improve battery rate performance. The preparation process of the invention is simple to operate and is very suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to new energy sources and is applied in the fields of batteries, etc., and specifically relates to a high-safety battery diaphragm and a preparation method thereof. A layer of inorganic oxide, and then a method for preparing a high-safety battery diaphragm formed by grafting a voltage-sensitive organic monomer on the surface of the inorganic oxide through surface modification. The present invention also relates to a high-safety battery diaphragm obtained by the above method and Its application in chemical power systems such as lithium-ion batteries. Background technique [0002] At present, chemical power systems using liquid electrolytes, such as lithium-ion batteries, need to use diaphragm materials to block the positive and negative electrodes to avoid short circuits. The diaphragm material is mainly composed of polyethylene (Polyethylene, PE), polypropylene (Polypropylene, PP), polytetrafluoroethylene (Polytetrafluoroethylene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/431H01M50/414H01M50/417H01M50/451H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 陈栩李周江映德
Owner 力源(广州)新能源科技有限公司
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