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Modified polyacrylonitrile non-woven/silicon dioxide aerogel composite separator for battery and preparation method of composite separator

A technology of polyacrylonitrile and silicon dioxide, applied in electrical components, battery components, circuits, etc., can solve the safety hazards of lithium-ion batteries, hinder the large-scale application of sodium-ion batteries, and directly contact the positive and negative electrodes of batteries and other issues, to achieve excellent electrochemical performance, light weight, and promote the effect of commercialization

Active Publication Date: 2019-03-08
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the commercialized lithium-ion battery polypropylene separator and polyethylene separator have strong mechanical properties, their thermal stability is poor, and their melting points are only 164 and 92 respectively. o C, it is very easy to cause thermal shrinkage to cause direct contact between the positive and negative electrodes of the battery, causing a greater safety hazard to the safety performance of lithium-ion batteries; for sodium-ion batteries, there is no commercial separator, which hinders the large-scale use of sodium-ion batteries application

Method used

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  • Modified polyacrylonitrile non-woven/silicon dioxide aerogel composite separator for battery and preparation method of composite separator
  • Modified polyacrylonitrile non-woven/silicon dioxide aerogel composite separator for battery and preparation method of composite separator
  • Modified polyacrylonitrile non-woven/silicon dioxide aerogel composite separator for battery and preparation method of composite separator

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Effect test

Embodiment 1

[0031] The preparation method of the modified polyacrylonitrile non-woven fabric / silica airgel composite diaphragm for the battery of the present embodiment is as follows:

[0032] (1) Dissolve polyacrylonitrile powder with a molecular weight of 150,000 in a mixed solvent of N,N dimethylformamide and acetone (mass ratio 7:3), with a mass fraction of 7%, and magnetically stir for 6 hours to obtain a uniform spinning liquid; polyacrylonitrile dope is produced by electrospinning equipment to obtain non-woven fabrics. Among them, the electrospinning needle is a flat needle, the needle is connected to the positive electrode of the high-voltage power supply, and the dope is released by a micro-injection pump. The parameters of the electrospinning process: the inner diameter of the needle is 0.8 mm, the voltage of the high-voltage power supply is 18 kV, and the extrusion speed of the dope is 0.8 mL / h , the distance from the needle to the receiving roller is 18 cm, the receiving plate...

Embodiment 2

[0040] The preparation method of the modified polyacrylonitrile non-woven fabric / silica airgel composite diaphragm for the battery of the present embodiment is as follows:

[0041] (1) Dissolve polyacrylonitrile powder with a molecular weight of 200,000 in a mixed solvent of N,N dimethylformamide and acetone (mass ratio 7:3), with a mass fraction of 5%, and magnetically stir for 6 hours to obtain a uniform spinning liquid; polyacrylonitrile dope is produced by electrospinning equipment to obtain non-woven fabrics. Among them, the electrospinning needle is a flat needle, the needle is connected to the positive electrode of the high-voltage power supply, and the dope is released by a micro-injection pump. The process parameters of the electrospinning: the inner diameter of the needle is 0.8 mm, the high-voltage power supply voltage is 18 kV, and the extrusion speed of the dope is 0.8mL / h , the distance from the needle to the receiving roller is 18 cm, the receiving plate is alum...

Embodiment 3

[0045] The preparation method of the modified polyacrylonitrile non-woven fabric / silica airgel composite diaphragm for the battery of the present embodiment is as follows:

[0046] (1) Dissolve polyacrylonitrile powder with a molecular weight of 150,000 in a mixed solvent of N,N dimethylformamide and acetone (mass ratio 7:3), with a mass fraction of 7%, and magnetically stir for 6 hours to obtain a uniform spinning liquid; polyacrylonitrile dope is produced by electrospinning equipment to obtain non-woven fabrics. Among them, the electrospinning needle is a flat needle, the needle is connected to the positive electrode of the high-voltage power supply, and the dope is released by a micro-injection pump. The process parameters of the electrospinning: the inner diameter of the needle is 0.8 mm, the high-voltage power supply voltage is 18 kV, and the extrusion speed of the dope is 0.8mL / h , the distance from the needle to the receiving roller is 18 cm, the receiving plate is alum...

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Abstract

The invention discloses a modified polyacrylonitrile non-woven / silicon dioxide aerogel composite separator for a battery and a preparation method of the composite separator. The separator is in a waythat silicon dioxide aerogel is grown on a surface of a polyacrylonitrile non-woven fabric in an in-situ way. The preparation method comprises the steps of preparing a polyacrylonitrile non-woven fabric, immersing the polyacrylonitrile non-woven fabric in an alkali solution for hydrolysis, processing the polyacrylonitrile non-woven fabric with an ethanol solution of ammonium hydroxide, immersing the modified polyacrylonitrile non-woven fabric in silicon dioxide sol, and obtaining the composite separator after drying, wherein the silicon dioxide sol can be uniformly grown and coated on the fiber surface. The polyacrylonitrile non-woven fabric easy to use on a large scale is used as a composite separator substrate, the silicon dioxide aerogel with good heat resistance and light mass is usedas a coating material, the heat-resistant temperature of the composite separator can reach 240 DEG C, and the heat resistance of the separator is greatly improved. The composite separator can be applicable to a lithium ion battery and a sodium ion battery and has excellent safety and electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium / sodium ion batteries, and in particular relates to a modified polyacrylonitrile nonwoven fabric / silica airgel composite diaphragm for batteries and a preparation method thereof. technical background [0002] With the wide application of energy storage devices such as batteries, battery safety has become the primary consideration in the development process. Lithium and sodium ion batteries are mainly composed of positive and negative electrodes, electrolyte, separator, casing and so on. As an important part of the battery, the separator plays an important role in isolating the positive and negative electrodes while allowing ions to shuttle freely. Its performance affects the capacity, cycle life and safety performance of the battery. Although the commercialized lithium-ion battery polypropylene separator and polyethylene separator have strong mechanical properties, their thermal stability is poor,...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14D06M11/79D06M101/28H01M50/403H01M50/446H01M50/489
CPCD06M11/79D06M2101/28H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 陈卫华冯祥明张路鹏冯冠华米立伟崔世忠刘春太
Owner ZHENGZHOU UNIV