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High-safety non-woven-fabric-based composite separation film and preparation method thereof

A non-woven-based, composite diaphragm technology, applied in structural parts, electrical components, battery pack parts, etc., can solve the problems of poor heat resistance of the diaphragm, unfavorable use of the diaphragm, etc. Effects of insulation, good ion transport and structural stability

Pending Publication Date: 2018-08-21
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The suitable pore size of the separator reduces the risk of short circuit for the battery and improves the volume specific capacity of the battery; however, the separator uses thermoplastic organic polymer particles, which makes the separator have poor heat resistance, which is not conducive to the use of the separator in a high temperature environment

Method used

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  • High-safety non-woven-fabric-based composite separation film and preparation method thereof
  • High-safety non-woven-fabric-based composite separation film and preparation method thereof
  • High-safety non-woven-fabric-based composite separation film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing a high-safety non-woven fabric-based composite diaphragm, the specific steps are as follows:

[0037] (1) Take 5g of polyetherimide particles, slowly add it to 95g of dimethylformamide reagent at a temperature of 120°C, stir until the polyetherimide particles are completely dissolved, and then cool the solution to 80°C , adding 3 drops of ethylene glycol monobutyl ether therein, stirring evenly to obtain a coating solution;

[0038] (2) Completely immerse the PET substrate with a thickness of 15 μm and a porosity of 70% in the mixed solution for 2 minutes, take out the PET composite membrane, remove the residual solution on the surface of the PET composite membrane with a scraper with a distance of 20 μm, and then air-dry it naturally for 30 minutes , and then vacuum-dried at 120°C for 12 hours to obtain a high-safety non-woven fabric-based composite separator.

[0039] The performance of the high-safety non-woven fabric-based composite diaphragm...

Embodiment 2

[0043] A method for preparing a high-safety non-woven fabric-based composite diaphragm, the specific steps are as follows:

[0044] (1) Take 10g of polyamic acid, slowly add it to the dimethylacetamide reagent with a mass of 90g and a temperature of 100°C, stir until a uniform solution is formed, cool the solution to 50°C, and add 3 drops of polyethylene glycol to it. Glycol, stir evenly, obtain coating solution;

[0045] (2) Submerge the polyacrylonitrile substrate with a thickness of 12 μm and a porosity of 60% in the mixed solution for 2 minutes, take out the polyacrylonitrile composite diaphragm, and remove the residual solution on the surface of the polyacrylonitrile composite diaphragm with a spatula with a distance of 15 μm , naturally air-dried in the air for 30 minutes, and then vacuum-dried at 120°C for 12 hours to obtain a high-safety non-woven fabric-based composite separator.

Embodiment 3

[0047] A method for preparing a high-safety non-woven fabric-based composite diaphragm, the specific steps are as follows:

[0048] (1) Take 10g of polyetherimide particles, slowly add it to N-methylpyrrolidone reagent with a mass of 90g and a temperature of 100°C, stir until the polyetherimide particles are completely dissolved, and then cool the solution to 80°C , adding 3 drops of ethylene glycol monobutyl ether therein, stirring evenly to obtain a coating solution;

[0049] (2) Completely immerse the PET substrate with a thickness of 12 μm and a porosity of 80% in the mixed solution for 2 minutes, take out the PET composite membrane, remove the residual solution on the surface of the PET composite membrane with a scraper with a distance of 15 μm, and then air dry it naturally for 30 minutes , and then vacuum-dried at 100°C for 24 hours to obtain a high-safety non-woven fabric-based composite separator.

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Abstract

The invention discloses a high-safety non-woven-fabric-based composite separation film and a preparation method thereof, wherein the high-safety non-woven-fabric-based composite separation film comprises a non-woven fabric substrate, the surface and the pores of the non-woven fabric substrate are filled with a high melting point organic polymer, and the high melting point organic polymer is at least one selected from polymethyl methacrylate, polyamic acid, polyether imide, aromatic diamine, aromatic dianhydride, polyurethane and polyether sulfone. According to the present invention, the non-woven fabric substrate is coated with the special high melting point organic polymer, such that the obtained non-woven fabric separation film has good electronic insulation property and excellent thermal stability, and can easily improve the safety of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-safety non-woven fabric-based composite diaphragm and a preparation method thereof. Background technique [0002] As one of the key materials of lithium-ion batteries, the diaphragm plays the role of isolating the positive and negative electrodes and transporting ions. Polyolefin separators are widely used commercially today, and have the advantages of high mechanical strength, appropriate porosity, low price, simple preparation process and stable electrochemical performance. However, with the rapid development of new energy vehicles and other fields, people have higher and higher requirements for the safety of batteries. Since polyolefin separators have an inherent melting point of only 130-170°C, they are prone to large-area shrinkage at high temperatures and cause battery internal damage. Short circuit, causing safety accidents, is difficult to meet the r...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/411H01M50/44H01M50/489
CPCH01M50/403H01M50/411Y02E60/10
Inventor 李为标史凌俊孙伟
Owner TIANNENG SAFT ENERGY JOINT CO
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