Preparation method of high-safety long-life ceramic diaphragm

A ceramic diaphragm, high-safety technology, applied in the field of electrochemistry, can solve problems such as applications that cannot meet safety requirements, increased internal resistance, membrane rupture, etc.

Inactive Publication Date: 2021-08-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, as the temperature rises, after the polyolefin base film melts, the mechanical properties of the separator drop significantly, the membrane breaks, and even cannot support the film formation.
Obviously, this cannot meet the needs of applications requiring high security
A cera

Method used

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  • Preparation method of high-safety long-life ceramic diaphragm
  • Preparation method of high-safety long-life ceramic diaphragm
  • Preparation method of high-safety long-life ceramic diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Fully mix silica spherical powder with a particle size of about 300nm, binder (styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC)) to make a slurry, and its mass ratio is: silica / SBR / CMC=0.95g / 0.03g / 0.02g, the solvent is a water / ethanol mixture with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10.

[0056] The prepared slurry was evenly coated on both sides of a commercial polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50° C. for 10 hours to obtain a silica ceramic coated separator.

[0057] Use a water / ethanol mixture with a volume ratio of 1:1 as a solvent to prepare a water-soluble phenolic resin solution with a mass fraction of 10 g / L and a molecular weight of 3000.

[0058] Pour the previously prepared silica ceramic-coated diaphragm into the above-mentioned prepared water-soluble phenolic resin solution, place the system on a shaker, shake at a frequen...

Embodiment 2

[0068] The difference between embodiment 2 and embodiment 1 is:

[0069] Fully mix alumina powder with a particle size of 300nm and a binder (polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)) to make a slurry, the mass ratio of which is: alumina / PVDF-HFP=0.9g / 0.1g, the solvent is NMP / acetone mixed solution with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10.

[0070] The prepared slurry was evenly coated on one side of a commercial polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50° C. for 10 hours to obtain an alumina ceramic coated separator.

[0071] Use a water / ethanol mixture with a volume ratio of 1:1 as a solvent to prepare a water-soluble phenolic resin solution with a mass fraction of 15g / L and a molecular weight of 3000.

[0072] The above prepared water-soluble phenolic resin solution was scratch-coated on the previously prepared alumina ceramic coated diaph...

Embodiment 3

[0076] 2gPMMA was dissolved in 8gDMF solvent, stirred on a magnetic stirrer for 12h, and ultrasonicated for 10min to remove air bubbles. Take 1mL of the PVDF solution into a 3mL syringe, take the 20cm×80cm ceramic diaphragm base material of the three-dimensional composite structure in Example 1, put it on the round roller collector and fix it with adhesive tape, with the ceramic layer facing outwards, and adjust the electrospinning speed. The parameters are: positive voltage is 10kV; negative voltage is -2kV; injector advance speed is 0.02mm / min; collector rotation speed is 50rpm; distance between injector and collector is 25cm; temperature is 30°C; humidity is 50% ; After 60min, a PMMA polymer layer with a thickness of about 1 μm was obtained, which was placed in a vacuum drying oven at 60°C for 24h, and then fixed on the round roller collector again, with the ceramic layer facing inward, and 1mL of Put the PMMA solution into a 3mL syringe, and use the same electrospinning pa...

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Abstract

The invention discloses a preparation method of a high-safety long-life ceramic diaphragm. The preparation method comprises the following steps of: 1) preparation of a polymer solution, specifically, dissolving polymer powder and ultrasonically removing bubbles to prepare a polymer solution with the mass concentration of 5-30%; 2) preparation of a three-dimensional composite ceramic diaphragm, specifically, taking an organic diaphragm base material with holes, coating the surface of the organic diaphragm base material with a layer of ceramic slurry, and drying to form a ceramic coating layer to obtain a ceramic coating diaphragm, continuously coating the surface of the ceramic coating diaphragm and the inner walls of the holes with a heat-resistant layer to obtain a three-dimensional composite ceramic diaphragm; 3) preparation of a high-safety long-life ceramic diaphragm,specifically, preparing a polymer layer with the thickness of 5nm-10mu m on the surface of the three-dimensional composite ceramic diaphragm by adopting an electrostatic spinning technology, and then drying and hot-pressing to obtain the high-safety long-life ceramic diaphragm.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a high-safety and long-life ceramic diaphragm. Background technique [0002] As a green chemical power source with high energy density, high output voltage, no memory effect, and environmental friendliness, lithium-ion batteries have good economic benefits, social benefits, and strategic significance, and have been widely used in mobile devices, digital Products and other fields, and it is very likely to become the most important power supply system in the field of electric vehicles and energy storage. With the development of mobile devices and electric vehicles, there are higher requirements for battery capacity, safety and cycle performance. [0003] The separator is a microporous film placed between the positive and negative electrodes of the battery, through which ions can pass freely while blocking the direct contact between the positive a...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/434H01M50/457H01M50/417H01M50/491H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 赵金保胡特雄张鹏
Owner XIAMEN UNIV
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