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Silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and preparation method thereof

A polyvinylidene fluoride and dielectric composite technology, applied in the field of dielectric composite films, can solve the problems of composite material loss and leakage current increase, material flexibility damage, breakdown field strength drop and other problems, and achieve the improvement of field strength and polarization. , large polarization strength, improve the effect of interface polarization

Active Publication Date: 2021-09-24
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of high-dielectric ceramic nano-fillers, the dielectric properties of the composite material are significantly improved, and the energy storage density is improved. However, with the increase of the filler content, the dispersion of the filler in the matrix will also decrease, and the defects and The phenomenon of agglomeration is also increasing, which will lead to a sharp drop in the breakdown field strength, and at the same time, the flexibility of the material itself will be destroyed
Although the preparation of composite materials by utilizing the advantages of various materials can increase the energy storage density, the biggest disadvantage is the low charge and discharge efficiency, because it is difficult to achieve uniform dispersion of various fillers in the polymer matrix, and it is easy to agglomerate and entangle with each other, so that The loss and leakage current of composite materials increase, and the energy storage efficiency decreases significantly

Method used

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  • Silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and preparation method thereof
  • Silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and preparation method thereof
  • Silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A dielectric composite film with silver-titanium dioxide filler doped with polyvinylidene fluoride, the composite film is composed of silver-titanium dioxide (Ag@TO@TO) filler filled in polyvinylidene fluoride matrix, silver-titanium dioxide filler core-shell structure, in which the core layer is one-dimensional titania nanowires (TO NWs) coated with bark-like flaky titania (p-TO), and the shell layer is silver nanoparticles (Ag NPs) modified on the surface of flaky titania ), the preparation process is as follows:

[0038] 1. Synthesize titanium dioxide nanowires (TO NWs) from titanium dioxide nanopowder by hydrothermal method, and dry it for later use, as follows: uniformly disperse titanium dioxide nanopowder in 10 M sodium hydroxide aqueous solution, ultrasonically disperse for 30 min, and then stir with magnetic force After 12 h, the mixture was transferred to a reaction kettle, put into a blast drying oven, heated at 200 °C for 24 h, taken out, cooled naturally, w...

Embodiment 2

[0046] Same as the above example 1, the difference is that in step 4, 0.00615 g Ag@TO@TO filler was dispersed in 3.5 mL of organic solvent N-N dimethylformamide (DMF), then ultrasonicated for 1 h, stirred for 2 h, and then added 0.5 g polyvinylidene fluoride (PVDF) was stirred for 24 h, and a dielectric composite film with a silver-titania filler volume fraction of 1% silver-titania filler doped polyvinylidene fluoride was prepared by solution casting method.

Embodiment 3

[0048] Same as the above example 1, the difference is that in step 4, 0.01848 g Ag@TO@TO filler was dispersed in 3.5 mL of organic solvent N-N dimethylformamide (DMF), then ultrasonicated for 1 h, stirred for 2 h, and then added 0.5 g polyvinylidene fluoride (PVDF) was stirred for 24 h, and a dielectric composite film with silver-titania filler doped PVDF with a volume fraction of 1.5% silver-titania filler was prepared by solution casting method.

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Abstract

The invention discloses a silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and a preparation method thereof, and is characterized in that the composite film is compounded by filling a polyvinylidene fluoride matrix with a silver-titanium dioxide filler, and the silver-titanium dioxide filler is of a core-shell structure, wherein a core layer is a bark-shaped one-dimensional titanium dioxide nanowire with the surface coated with flaky titanium dioxide, a shell layer is silver nanoparticles modified on the surface of the flaky titanium dioxide, and the preparation method comprises the following steps: dispersing the prepared silver-titanium dioxide filler in an organic solvent N-N dimethylformamide, then performing ultrasonic stirring, adding polyvinylidene fluoride, stirring, and preparing a dielectric composite film of the silver-titanium dioxide filler doped with polyvinylidene fluoride by adopting a solution casting method, wherein the volume fraction of the silver-titanium dioxide filler is 0.5-2%. The material has the advantages of extremely high polarization, relatively high charging and discharging efficiency and extremely high energy density under relatively low electric field intensity.

Description

technical field [0001] The invention relates to a dielectric composite film, in particular to a dielectric composite film with silver-titanium dioxide filler doped with polyvinylidene fluoride and a preparation method thereof. Background technique [0002] As the world's demand for reducing carbon dioxide emissions and fossil fuel consumption continues to increase, high-efficiency electrical energy storage technologies dedicated to intermittent and unstable energy sources such as solar energy and wind energy are becoming an inevitable choice for sustainable development. Dielectric capacitors have attracted much attention due to their wide applications in electronic circuits, hybrid vehicles, renewable energy storage devices, etc. Polymers are the material of choice for thin film dielectric capacitors due to their advantages of ease of processing, mechanical flexibility, and high breakdown strength compared to ceramic materials. However, the low energy density of polymer die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/16C08K7/08C08K9/10C08K7/00C08K3/22C08K3/08
CPCC08J5/18C08J2327/16C08K7/08C08K9/10C08K7/00C08K2003/2241C08K2003/0806
Inventor 李伟平侯亚飞武志杰陈辉
Owner NINGBO UNIV
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