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High-performance flexible composite nonwoven fabric membrane for lithium ion battery, as well as preparation method and application of membrane

A lithium-ion battery and non-woven membrane technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of complex preparation process, reduction of the maximum pore size of the non-woven membrane, and high membrane cost

Inactive Publication Date: 2013-09-11
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the electrochemical performance of the non-woven membrane, it is necessary to reduce the maximum pore size of the non-woven membrane, and there are certain problems in the modification techniques reported so far.
However, due to the complicated preparation process and high cost of the film, the new film-forming technology cannot compete with the non-woven film for the time being.

Method used

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  • High-performance flexible composite nonwoven fabric membrane for lithium ion battery, as well as preparation method and application of membrane
  • High-performance flexible composite nonwoven fabric membrane for lithium ion battery, as well as preparation method and application of membrane
  • High-performance flexible composite nonwoven fabric membrane for lithium ion battery, as well as preparation method and application of membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A high-performance flexible composite non-woven fabric film with good dimensional stability, prepared by the following method:

[0086] According to the mass ratio, 10 parts of 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane (ECTS) (see formula IV for structure), 10 parts of diphenylsilanediol (DPSD) (see formula for structure V), 40 parts of polyethylene glycol dimethyl ether and 0.2 parts of barium hydroxide were mixed, and reacted at 80° C. for 4 hours. Disperse 40 parts of 200nm silicon dioxide in ethanol, then add it to the above system, continue to react at 80°C for 8 hours, cool to room temperature, add 0.05 parts of photoinitiator diaryliodonium salt, and remove the bulk under reduced pressure. part of ethanol to obtain a functional coating solution. Roll-coat the functional coating liquid on the PP non-woven film with hydroxyl groups (thickness 15 μm, area density 18±4g / m2) 2, porosity ≥ 65%), the thickness of the composite film is controlled at about 30 μm, an...

Embodiment 2

[0118] A kind of high-performance flexible composite non-woven fabric membrane with good dimensional stability, its preparation method is except that used feedstock is 15 parts of ECTS, 5 parts of DPSD, 50 parts of polyethylene glycol dimethyl ether, 40 parts of 100nm dioxide Silicon, the reaction temperature in step 1 is 60°C, methyl hexahydrophthalic anhydride is used as the curing agent during curing, heat curing is used instead of light curing as the curing method, and the heat curing condition is 90°C for 16 hours. Other operations and raw materials are the same. With embodiment 1.

[0119] Determination of the Gurley value of the high-performance flexible composite non-woven fabric film with good dimensional stability, the liquid absorption rate to the electrolyte, MacMullin number (Nm) and thermal shrinkage rate of the high-performance flexible composite non-woven fabric film prepared in this example, and using the prepared in this example The composite separator was ma...

Embodiment 3

[0121] A kind of high-performance flexible composite non-woven fabric film with good dimensional stability, its preparation method is except that the used feeding amount is 10 parts of ECTS, 5 parts of DPSD, 50 parts of polyethylene glycol dimethyl ether, 35 parts of 100nm aluminum oxide , the reaction temperature in step 1 is 90°C, and a PP non-woven membrane with amino groups on the surface (thickness 15μm, surface density 18±4g / m 2 , porosity ≥ 65%) to replace the PP non-woven fabric film with hydroxyl groups on the surface, no light curing agent and heat curing agent are added during curing, and heat curing is used instead of light curing. The heat curing condition is 100°C for 8 hours, and other operations All with embodiment 1 with raw material.

[0122] Measure the Gurley value of the high-performance flexible composite non-woven fabric film with good dimensional stability, the liquid absorption rate to the electrolyte, MacMullin number and thermal shrinkage rate of the...

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Abstract

The invention discloses a high-performance flexible composite nonwoven fabric membrane for a lithium ion battery, as well as a preparation method and an application of the membrane, which belongs to the technical field of a lithium-ion battery membrane material. The prepared composite nonwoven fabric membrane is formed by coating functional serous fluid with thermally curable or optically curable functional groups onto a substrate membrane containing an active functional group, thermally curing or optically curing the substrate membrane, removing a pore-forming agent, and hot pressing and drying the substrate. The prepared composite nonwoven fabric membrane is good in flexibility. The composite nonwoven fabric membrane has good ion electric conductivity and hot shrinkage resistance, can bear the large-current discharge, and also can improve the safety performance of the battery. Since no fluorine-containing adhesive is used in a preparation process, nano particles or nano optical fibers are connected with the substrate membrane through a chemical key, the nano particles or the nano fibers are bonded together through the chemical key and free from dropping off in the charging-discharging cycle, the stability of the coating is enhanced, and the cycling performance of the battery can be improved. The prepared flexible composite nonwoven fabric membrane is used as a membrane assembly of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery membrane materials, and in particular relates to a high-performance flexible composite non-woven fabric membrane for lithium-ion batteries, a preparation method and application thereof. Background technique [0002] Lithium-ion battery is an electrical device that realizes energy conversion, storage and release of electrical energy through the migration of lithium ions between the positive and negative electrodes. Lithium-ion batteries are widely used in digital cameras, mobile phones, In small and medium electronic devices such as notebook computers. [0003] Due to the increasing shortage of chemical energy and the increasing pressure on environmental protection, many countries have devoted themselves to developing environmentally friendly electric bicycles, pure electric vehicles, and hybrid electric vehicles (HEV) in recent years. The specific energy density of lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 胡继文胡盛逾李妃涂园园刘国军罗洪盛张干伟林树东
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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