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Polyvinylidene fluoride-hexafluoropropylene/titanium dioxide composite film, preparation method thereof, and application thereof

A technology of polyvinylidene fluoride and titanium dioxide, which is applied in nanotechnology for materials and surface science, electrical components, nanotechnology, etc., can solve problems such as low porosity, poor electrolyte affinity, and poor heat resistance. Achieve high porosity, enhanced affinity, and good affinity

Inactive Publication Date: 2019-12-20
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing commercial lithium battery separators mainly use polyethylene and polypropylene microporous membranes, but the above separators have the disadvantages of poor heat resistance, low porosity and poor electrolyte affinity

Method used

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  • Polyvinylidene fluoride-hexafluoropropylene/titanium dioxide composite film, preparation method thereof, and application thereof
  • Polyvinylidene fluoride-hexafluoropropylene/titanium dioxide composite film, preparation method thereof, and application thereof
  • Polyvinylidene fluoride-hexafluoropropylene/titanium dioxide composite film, preparation method thereof, and application thereof

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preparation example Construction

[0031] In the present invention, the preparation method of the carboxy-modified titanium dioxide nanofiber preferably comprises the following steps:

[0032] Titanium dioxide nanofibers and citric acid are mixed and ground, dispersed in water, and then centrifuged to obtain carboxyl-modified titanium dioxide nanofibers.

[0033] The invention mixes and grinds titanium dioxide nanofibers and citric acid to obtain a mixture of titanium dioxide nanofibers and citric acid. In the present invention, the mixed grinding can make the titanium dioxide nanofibers and citric acid mix more uniformly.

[0034] In the present invention, the diameter of the titanium dioxide nanofiber is preferably 50-300 nm, more preferably 100-300 nm; the length is preferably 1-100 μm. In the present invention, the titanium dioxide nanofibers of the above specifications are conducive to uniform dispersion in polyvinylidene fluoride-hexafluoropropylene.

[0035] In the present invention, the mass ratio of ...

Embodiment 1

[0058] (1) Mix ethanol, acetic acid and tetrabutyl titanate according to the mass ratio of 10:4:3, stir magnetically at room temperature for 2 hours, then add polyvinylpyrrolidone, the concentration of polyvinylpyrrolidone is 0.045g / mL, Stir until the polyvinylpyrrolidone is completely dissolved to obtain a titanium dioxide precursor solution, then obtain a titanium dioxide nanofiber precursor by electrospinning, and calcinate the titanium dioxide nanofiber precursor at 550 ° C for 2 hours to obtain titanium dioxide nanofibers, the titanium dioxide nanofibers The diameter is 100-300nm, and the length is 1-100μm;

[0059] (2) After titanium dioxide nanofibers and citric acid are mixed and ground according to the mass ratio of 1:1, they are dispersed in water, stirred for 2h, and then centrifuged at 10000rpm for 5min to obtain carboxy-modified titanium dioxide nanofibers;

[0060] (3) adding the carboxyl-modified titanium dioxide nanofibers into the N-methylpyrrolidone solvent, ...

Embodiment 2

[0066] (1) Mix ethanol, acetic acid and tetrabutyl titanate according to the mass ratio of 10:4:3, stir magnetically at room temperature for 2 hours, then add polyvinylpyrrolidone, the concentration of polyvinylpyrrolidone is 0.045g / mL, Stir until the polyvinylpyrrolidone is completely dissolved to obtain a titanium dioxide precursor solution, then obtain a titanium dioxide nanofiber precursor by electrospinning, and calcinate the titanium dioxide nanofiber precursor at 550 ° C for 2 hours to obtain titanium dioxide nanofibers, the titanium dioxide nanofibers The diameter is 100-300nm, and the length is 1-100μm;

[0067] (2) Mix and grind titanium dioxide nanofibers and citric acid according to the mass ratio of 1:1, disperse them in water, stir for 2 hours, and then centrifuge at 10,000 rpm for 5 minutes to obtain carboxyl-modified titanium dioxide nanofibers, said carboxyl-modified titanium dioxide nanofibers fiber;

[0068] (3) adding the carboxyl-modified titanium dioxide...

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Abstract

The invention provides a polyvinylidene fluoride-hexafluoropropylene / titanium dioxide composite film, a preparation method thereof, and application thereof, and belongs to the technical field of lithium battery diaphragms. The polyvinylidene fluoride-hexafluoropropylene / titanium dioxide composite film provided by the invention comprises polyvinylidene fluoride-hexafluoropropylene, carboxyl modified titanium dioxide nanofibers and dibutyl phthalate. The polyvinylidene fluoride-hexafluoropropylene / titanium dioxide composite film provided by the invention still has no thermal shrinkage phenomenonat 150 DEG C, the composite film can be normally used at 110 DEG C, the composite film has high porosity of 50%-70% and good affinity with an electrolyte, and the composite film can be used as a lithium battery diaphragm.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragms, in particular to a polyvinylidene fluoride-hexafluoropropylene / titanium dioxide composite film and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, and tools due to their advantages such as high energy density, low self-discharge, long cycle life, and environmental protection. In the structure of lithium batteries, the separator is one of the key inner components. The function of the diaphragm is to isolate the positive and negative electrode materials and transmit lithium ions, and its performance directly affects the safety performance and service life of lithium-ion batteries. [0003] With the development of the field of lithium-ion batteries, the market has higher and higher requirements for the performance of lithium-ion batteries, and at the same tim...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052B82Y30/00
CPCB82Y30/00H01M10/052H01M50/403H01M50/431H01M50/44H01M50/449Y02E60/10
Inventor 马增胜孙坤李玲蒋文娟檀朝贵邹幽兰雷维新
Owner XIANGTAN UNIV
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