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Electrostatic spinning gel battery diaphragm, preparation method and application thereof

An electrospinning, gel battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as deficiencies, achieve high oxidation limit, improve safety and stability, and high ionic conductivity.

Pending Publication Date: 2021-01-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of the insufficient mechanical properties of the gel electrolyte separator in the prior art, the primary purpose of the present invention is to provide a method for preparing an electrospun gel battery separator; the method has simple steps and does not need to be soaked in a polymer solution Preparation of gel battery separator with high liquid absorption rate, high ionic conductivity and good mechanical properties

Method used

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  • Electrostatic spinning gel battery diaphragm, preparation method and application thereof
  • Electrostatic spinning gel battery diaphragm, preparation method and application thereof
  • Electrostatic spinning gel battery diaphragm, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] At room temperature, polyvinylidene fluoride powder and polyacrylonitrile were blended and dissolved in a mixed solution with acetone: N,N-dimethylformamide molar ratio of 3:1 to prepare a solution with a mass fraction of 8 wt%. , wherein the mass content of polyvinylidene fluoride is 30%, polyacrylonitrile is 70%; 50 ℃ water bath stirring for 24h, to obtain a uniform spinning solution; under the voltage of 20kV, the polypropylene melt-blown nonwoven fabric is used as the receiving substrate , the receiving distance is 10cm, and its double-sided electrospinning is obtained by blending polymer composite film, which is hot-pressed by a smooth roller at 125°C, and then the heat-treated composite diaphragm is put into a coating machine to coat with 10wt% alumina Silicone-modified acrylic emulsion, the solid content of the silicone-modified acrylic emulsion is 10%, the coating speed is 2m / min, and finally placed in an oven for 6 hours at 60°C to obtain an electrospun gel batt...

Embodiment 2

[0028] At room temperature, polyvinylidene fluoride powder and polyacrylonitrile were blended and dissolved in a mixed solution of acetone: N,N-dimethylformamide molar ratio of 3:1 to obtain a solution with a mass fraction of 14 wt%. , wherein the mass content of polyvinylidene fluoride is 40%, polyacrylonitrile is 60%; 50 ℃ water bath stirring for 24h, to obtain a uniform spinning solution; under the voltage of 20kV, the polypropylene melt-blown non-woven fabric is used as the receiving substrate , the receiving distance is 20cm, and its double-sided electrospinning is obtained by blending polymer composite membrane, which is hot-pressed by a smooth roller at 125°C, and then the heat-treated composite membrane is put into a coating machine to coat with 10wt% carbon dioxide Silicone silicone-modified acrylic emulsion, the solid content of the silicone-modified acrylic emulsion is 40%, the coating speed is 1.5m / min, and finally placed in an oven at 60°C for 6 hours to obtain an ...

Embodiment 3

[0030] At room temperature, polyvinylidene fluoride powder and polyacrylonitrile were blended and dissolved in a mixed solution of acetone: N,N-dimethylformamide molar ratio of 3:1 to obtain a solution with a mass fraction of 12 wt%. , wherein the mass content of polyvinylidene fluoride is 35%, polyacrylonitrile is 65%; 50 ℃ water bath stirring for 24h, to obtain a uniform spinning solution; under the voltage of 20kV, the polypropylene melt-blown nonwoven fabric is used as the receiving substrate , the receiving distance is 15cm, and its double-sided electrospinning is obtained by blending polymer composite film, which is hot-pressed by a smooth roller at 125°C, and then the heat-treated composite diaphragm is put into a coating machine to coat with 10wt% alumina Silicone-modified acrylic emulsion, the solid content of the silicone-modified acrylic emulsion is 10%, the coating speed is 2m / min, and finally placed in an oven for 6 hours at 60°C to obtain an electrospun gel batter...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses an electrostatic spinning gel battery diaphragm, a preparation method and application thereof. The method comprisesthe following operation steps: dissolving a blended polymer in a solvent to prepare a spinning solution; carrying out double-sided electrostatic spinning by using a melt-blown non-woven fabric as a receiving base at a positive voltage of 20 kV, a negative voltage of 2 kV, an extrusion speed of 0.5 mL / h, a receiving roller speed of 200 r / min and a receiving distance of 10-20 cm; and after carryingout double-sided electrostatic spinning, carrying out hot pressing by using a smooth roller at 120-130 DEG C, coating with an organic silicon resin containing an inorganic filler at a coating speed of 1.5-2 m / min by using a coating machine, putting into a drying oven, and drying for 6 hours at 60 DEG C to obtain the electrostatic spinning gel battery diaphragm. According to the invention, the micro-morphology and the mechanical property of the diaphragm are controlled by adjusting the polymer content, the polymer ratio, the receiving distance and the solid content of the organic silicon resin.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrospinning gel battery separator and its preparation method and application. Background technique [0002] Lithium-ion batteries are used due to their high energy ratio (~150Wh Kg -1 ) and are widely used in mobile phones, notebook computers, digital cameras and other electronic devices, high energy density (~400Wh L -1 ), high working voltage (2.5~4.2V), long cycle life (>1000 cycles), low self-discharge rate (2~8% per month). Other advantages of Li-ion batteries include high Coulombic efficiency and no memory effect. Currently, lithium-ion batteries are finding new applications in electric / hybrid vehicles and smart grid energy storage. For these new application areas, new battery components are required in order to develop Li-ion batteries with higher battery performance, better safety and lower cost. [0003] The separator is an essenti...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/44H01M50/414H01M50/417H01M50/449H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 薛南翔徐睿杰雷彩红陈壮鑫
Owner GUANGDONG UNIV OF TECH
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