A kind of aramid fiber composite diaphragm based on in-situ modification, its preparation method and application

An in-situ modification and composite diaphragm technology, which is applied in the application field of aramid composite diaphragm and lithium-sulfur battery, can solve the problems of complex process, difficulty in inhibiting lithium-sulfur battery polysulfide shuttle, and little improvement in battery performance. Achieve the effects of simple and controllable process, easy continuous industrial production, enhanced thermal stability and safety performance

Active Publication Date: 2022-05-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This application aims to improve the deficiencies in the preparation process and performance of the existing aramid composite battery separators. For example, the production of aramid coated separators requires binders, and the process is relatively complicated, which does not greatly improve battery performance, and it is difficult to inhibit lithium sulfur. Battery polysulfide shuttle and other issues

Method used

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  • A kind of aramid fiber composite diaphragm based on in-situ modification, its preparation method and application
  • A kind of aramid fiber composite diaphragm based on in-situ modification, its preparation method and application
  • A kind of aramid fiber composite diaphragm based on in-situ modification, its preparation method and application

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Effect test

Embodiment 1

[0038] An aramid composite diaphragm based on in-situ modification, including a polyethylene microporous diaphragm base film and an aramid composite coating coated on one side of the base film. The aramid composite coating is modified in situ by functional nanoparticles of tungsten oxide It is coated with aramid nanofibers; the thickness of the polyethylene microporous diaphragm is 5 μm, and the porosity is 30%; the aramid fiber is para-aramid fiber, and the molecular weight is 5000-10000Da; The ratio is 1:10; the thickness of the aramid composite coating is 0.5 μm.

[0039] The preparation method of the aramid fiber composite diaphragm based on in-situ modification comprises the following steps:

[0040] (1) Preparation of aramid fiber solution: Take 12g of aramid fiber, 12g of potassium hydroxide, 12ml of water and 1160ml of dimethyl sulfoxide, and stir continuously for 8 hours at 20°C to completely dissolve the aramid fiber to obtain aramid fiber solution;

[0041] (2) Pr...

Embodiment 2

[0049] An aramid composite diaphragm based on in-situ modification, including a polyethylene microporous diaphragm base film and an aramid composite coating coated on one side of the base film. The aramid composite coating is modified in situ by functional nanoparticles ZIF- 67 aramid nanofiber coated; polyethylene microporous membrane thickness is 16μm, porosity is 40%; aramid fiber is para-aramid fiber, molecular weight is 10000-100000Da; ZIF-67 and aramid nanofiber The mass ratio of the aramid composite coating is 1:1; the thickness of the aramid composite coating is 10 μm.

[0050] The preparation method of the aramid fiber composite diaphragm based on in-situ modification comprises the following steps:

[0051] (1) Preparation of aramid fiber solution: Take 12g of aramid fiber, 24g of potassium tert-butoxide, 24ml of methanol and 180ml of dimethyl sulfoxide, and stir continuously for 2 hours at 100°C to completely dissolve the aramid fiber to obtain aramid fiber solution...

Embodiment 3

[0059] An aramid composite diaphragm based on in-situ modification, including a polypropylene microporous diaphragm base film and an aramid composite coating coated on one side of the base film. The aramid composite coating is modified by in-situ modified functional nanoparticles disulfide Coated with molybdenum aramid nanofibers; polypropylene microporous diaphragm with a thickness of 40 μm and a porosity of 50%; aramid fibers are para-aramid fibers with a molecular weight of 10000-100000Da; molybdenum disulfide and aramid nanofibers The mass ratio of the aramid composite coating is 1:2; the thickness of the aramid composite coating is 2 μm.

[0060] The preparation method of the aramid fiber composite diaphragm based on in-situ modification comprises the following steps:

[0061] (1) Preparation of aramid fiber solution: take 12g of aramid fiber, 18g of sodium hydroxide, 24ml of ethanol and 550ml of dimethyl sulfoxide, and stir continuously for 5 hours at 60°C to completely ...

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Abstract

The invention discloses an aramid composite diaphragm based on in-situ modification and a preparation method thereof, comprising a diaphragm base film and an aramid composite coating coated on one side or both sides of the base film, the base film is a poly Olefin porous membrane, the aramid composite coating is coated with aramid nanofibers modified in situ with functional nanoparticles, and the functional nanoparticles are iron oxide, tungsten oxide, molybdenum disulfide or ZIF‑67 kind of. The aramid composite separator has good thermal stability and mechanical stability, and is applied in lithium-sulfur batteries, which can accelerate redox reaction and lithium ion transmission rate, and at the same time, it can well adsorb polysulfides and inhibit the shuttle of polysulfides , improve the cycle performance and rate performance of the battery, and enhance the thermal stability and safety performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery materials, and relates to an aramid fiber composite diaphragm based on in-situ modification, a preparation method thereof and an application in lithium-sulfur batteries. Background technique [0002] With the depletion of traditional fossil energy and the rapid development of power batteries and other fields, the development of high energy density energy storage systems has a good application prospect. As we all know, lithium-ion batteries have been widely used in aerospace, mobile communications and new energy vehicles due to their advantages of high voltage, high specific capacity and wide working range, but their safety problems limit their further development; With the rapid development of new energy vehicles and other fields, people have put forward higher requirements for lithium batteries, such as low price, high safety and high capacity. Among them, the lithium-sulfur batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/417H01M10/052H01M50/403H01M50/431H01M50/44H01M50/457H01M50/491
CPCH01M50/417H01M50/44H01M50/431H01M50/457H01M50/491H01M50/403H01M10/052Y02E60/10
Inventor 解孝林林荆娅周兴平叶昀昇王盼盼杨成荫裴会杰
Owner HUAZHONG UNIV OF SCI & TECH
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