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Polyvinylidene fluoride-hexafluoropropylene/cellulose/titanium dioxide composite membrane and preparation method and application thereof

A technology of polyvinylidene fluoride and titanium dioxide, which is applied in the field of lithium battery separators, can solve the problems of poor electrolyte affinity, low porosity, and poor heat resistance, and achieve enhanced affinity, high porosity, and improved heat resistance sexual effect

Inactive Publication Date: 2019-12-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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/cellulose/titanium dioxide composite membrane and preparation method and application thereof
  • Polyvinylidene fluoride-hexafluoropropylene/cellulose/titanium dioxide composite membrane and preparation method and application thereof
  • Polyvinylidene fluoride-hexafluoropropylene/cellulose/titanium dioxide composite membrane and preparation method and application thereof

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preparation example Construction

[0032] In the present invention, the preparation method of the carboxy-modified titanium dioxide nanofiber preferably comprises the following steps:

[0033] Titanium dioxide nanofibers and citric acid are mixed and ground, dispersed in water, and then centrifuged to obtain carboxyl-modified titanium dioxide nanofibers.

[0034] 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.

[0035] In the present invention, the diameter of the titanium dioxide nanofiber is 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.

[0036] In the present invention, the mass ratio of the titanium dioxide nanofi...

Embodiment 1

[0059] (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;

[0060] (2) After mixing and grinding titanium dioxide nanofibers and citric acid according to a ratio of 1:1 by mass, they were dispersed in water, stirred for 2 hours, and then centrifuged at 10,000 rpm for 5 minutes to obtain carboxyl-modified titanium dioxide nanofibers;

[0061] (3) adding the carboxyl-modified titanium dioxide nanofibers into the N-methylpyrroli...

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Abstract

The invention provides a polyvinylidene fluoride-hexafluoropropylene / cellulose / titanium dioxide composite membrane and a preparation method and application thereof, and belongs to the technical fieldof lithium battery diaphragms. The composition of the composite membrane comprises polyvinylidene fluoride-hexafluoropropylene, cellulose, carboxyl modified titanium dioxide nanofibers and dibutyl phthalate. The polyvinylidene fluoride-hexafluoropropylene / cellulose / titanium dioxide composite membrane still does not show heat shrinkage at 160 DEG C and can be used normally at 120 DEG C. Meanwhile,the composite membrane also has high porosity, the porosity is 50-70%, the affinity with electrolyte is good and the composite membrane can be used as the 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 / cellulose / 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 th...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/44Y02E60/10
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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