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Composite diaphragm as well as preparation method and application thereof

A composite diaphragm and composite coating technology, applied in the field of lithium ion batteries, can solve the problems of increased air permeability of composite diaphragms, increased internal resistance of lithium ion batteries, low product production efficiency, etc., and achieves good electrolyte wettability. , The effect of improving thermal stability and high production efficiency

Pending Publication Date: 2021-07-27
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned documents can improve the heat resistance of the diaphragm, the introduction of the polymer coating will increase the air permeability value of the composite diaphragm and reduce the ion conductivity, thereby increasing the internal resistance of the lithium-ion battery; and the coating process Complex, low product production efficiency

Method used

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  • Composite diaphragm as well as preparation method and application thereof
  • Composite diaphragm as well as preparation method and application thereof
  • Composite diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0086] This embodiment provides a method of preparing a composite diaphragm, the method comprising the steps of:

[0087] (1) Aluminum oxide, polystyrene acrylate, and the specific surface area of ​​the alumina is 6m. 2 / g, the particle diameter is 1.5 μm, the polystyrene acrylate has a molecular weight of 150W, a glass transition temperature of 5 ° C, stirred to dissolve, a mixed slurry having a viscosity of 55 cp, a solid content of 45%;

[0088] With the total mass of aluminum oxide and polystyrene acrylate, the total mass percentage of the alumina was 93%, and the mass content of the polystyrene acrylate was 7%;

[0089] (2) The mixed slurry obtained by step (1) is applied to one side of the polyvinyl group, the polyvinyl group having a thickness of 9 μm, a porosity of 40%, dried to obtain the composite diaphragm .

[0090] The composite diaphragm obtained in this example, such as figure 1 As shown, the composite coating has a thickness of 3 μm, and a composite coating SEM el...

Embodiment 2

[0092] This embodiment provides a method of preparing a composite diaphragm, the method comprising the steps of:

[0093] (1) Aluminum oxide, polystyrene acrylate, and the specific surface area of ​​the alumina is 8m. 2 / g, the particle diameter is 0.2 μm, the polystyrene acrylate is 100 W, the glass transition temperature is 10 ° C, stirred to dissolve, the viscosity is 50 cp, the solid content of 30% is a mixed slurry;

[0094] With the total mass of the alumina and the polystyrene acrylate, the total mass content of the alumina is 95%, and the mass content of the polystyrene acrylate is 5%;

[0095] (2) The mixed slurry obtained by step (1) is applied to both sides of the polyvinyl group, the polyvinyl group having a thickness of 9 μm, a porosity of 45%, dried to obtain the composite diaphragm .

[0096] The composite diaphragm obtained in this example, such as figure 2 As shown, the composite coating has a thickness of 2 μm.

Embodiment 3

[0098] This embodiment provides a method of preparing a composite diaphragm, the method comprising the steps of:

[0099] (1) In the addition of polystyrene acrylate, the polystyrene acrylate has a molecular weight of 200W, a glass transition temperature of -10 ° C, stirred to dissolve, and boehmite, the specific surface area of ​​the boehmite is 9M 2 / g, the particle size is 1 μm, stirred and mixed, and the viscosity is 60 cp, the solid content of 50% is mixed;

[0100] With the total mass of the boehmite and the polystyrene acrylate, the total mass content of the boehmite is 97%, and the mass content of the polystyrene acrylate is 3%. ;

[0101] (2) Getting polyfial fluoride to stir in water to dissolve, add boehmite, and the specific surface area of ​​the boeh is 6m. 2 / g, the particle diameter is 2 μm, stirred well, resulting in a ceramic slurry having a viscosity of 65 cp, a solid content of 50%;

[0102] With the total mass of the boehmite and polyvinylidene fluoride, the ...

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Abstract

The invention relates to a composite diaphragm as well as a preparation method and application thereof. The composite diaphragm comprises a base membrane and a composite coating coated at at least one side of the base membrane, and the composite coating comprises ceramic and a polymer which are mutually dispersed. The ceramic and the polymer are mutually dispersed, so that the composite diaphragm has good thermal stability, electrolyte wettability and excellent mechanical property, and meanwhile, the hardness of a battery is improved, and the safety performance of the lithium ion battery is greatly improved. The ceramic, the polymer and the base membrane are matched with one another, so that the composite diaphragm has a relatively lower air permeability value and relatively higher lithium ion conductivity, the internal resistance of the lithium ion battery is effectively reduced, the safety performance and hardness of the lithium ion battery are improved, and the composite diaphragm can be widely applied to the energy storage devices, such as power ion batteries, etc.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, and more particularly to a composite diaphragm and a preparation method thereof. Background technique [0002] The lithium-ion battery has advantages over energy, no pollution, long life and no memory effect, as the power source of new energy vehicles, has become a research hotspot in recent years. The diaphragm, a key safety component of a lithium ion battery, has a rich aperture structure, which is to block the contact of the positive electrode and the negative electrode, and provide a lithium ion transmission channel. [0003] At present, the commonly used membranes are mainly polyolefin diaphragms such as polyethylene (PE) and polypropylene (PP), since the melting point of polyethylene (PE) and polypropylene (PP) diaphragm is generally less than 200 ° C, poor heat resistance. Therefore, how to improve the heat resistance of the diaphragm becomes the focus of research. [0004...

Claims

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Application Information

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IPC IPC(8): H01M50/417H01M50/403H01M50/434H01M50/457H01M50/446H01M10/0525
CPCH01M10/0525Y02E60/10H01M50/434H01M50/457H01M50/446H01M50/403H01M50/491H01M50/417H01M50/451H01M50/489H01M50/42H01M50/443H01M10/052H01M50/426H01M50/449H01M50/414
Inventor 谭小芳陈星宇何巍刘建华刘金成
Owner EVE ENERGY CO LTD
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