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High-safety diaphragm material and preparation method and application thereof

A high-safety, diaphragm material technology, used in electrical components, electrochemical generators, circuits, etc., can solve problems such as battery performance degradation, and achieve the effects of improving heat resistance, high effectiveness, and improving ion transport characteristics

Active Publication Date: 2018-11-23
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 preparation method and application thereof
  • High-safety diaphragm material and preparation method and application thereof
  • High-safety diaphragm material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 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 this way, an o...

Embodiment 2

[0038] 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 for 5 secon...

Embodiment 3

[0044] 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 deposition cycles are...

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Abstract

The invention is mainly applied to the field of batteries, and particularly relates to a high-safety battery diaphragm and a preparation method thereof; more particularly, the high-safety battery diaphragm is formed by depositing a layer of inorganic oxide through an atomic layer deposition technology in advance on the surfaces of pores of a microporous diaphragm base material, and grafting voltage-sensitive organic monomers on the surface of the inorganic oxide through surface modification; the invention further relates to the high-safety battery diaphragm obtained by the method and an application of the high-safety battery diaphragm in a chemical power supply system such as a lithium ion battery and the like. The high-safety diaphragm provided by the invention not only has relatively high-temperature dimension stability, but also has the function of preventing overcharge of the battery, and has high ion conduction performance, so that the battery rate performance can be improved. Thepreparation process is simple to operate and the method 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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
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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