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Composite dielectric material with three-layer structure and preparation method thereof

A dielectric material and three-layer structure technology, applied in chemical instruments and methods, lamination, coating, etc., can solve the problems of decreased energy storage efficiency, reduced breakdown strength of composite materials, and limited improvement of energy storage performance. Achieve the effect of improving energy storage efficiency, improving breakdown performance and reducing conductance loss

Pending Publication Date: 2021-02-19
HUBEI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Li et al. made polyvinylpyrrolidone-coated barium titanate (BaTiO 3 ) filler and polyvinylidene fluoride (PVDF), when the content of modified barium titanate nanowires reaches 3 vol.%, the composite material has an energy storage density of 8.55J / cm under the condition of 300 MV / m 3 , compared with the polymer matrix, the improvement effect is obvious. However, the introduction of dielectric ceramics leads to a decrease in the breakdown strength of the composite material and a decrease in energy storage efficiency, which limits the improvement of energy storage performance.

Method used

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  • Composite dielectric material with three-layer structure and preparation method thereof
  • Composite dielectric material with three-layer structure and preparation method thereof
  • Composite dielectric material with three-layer structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 0.45 g of polyvinylidene fluoride-hexafluoropropylene powder in 10 mL of N,N-dimethylformamide solution, stir overnight until completely dissolved, then add 0.05 g of barium titanate nanoparticles to the above solution, continue After stirring for 1 h, ultrasonic treatment was performed for 30 min until the barium titanate nanoparticles were completely dispersed. The mixed solution prepared above was evenly coated on a clean and flat quartz glass plate with a spatula, and quickly dried in an oven at 60 °C for 24 h to obtain the outer The layer is a polyvinylidene fluoride-hexafluoropropylene / barium titanate film, that is, a dielectrically enhanced film, and the film thickness is 5 μm;

[0035] Dissolve 0.5 g of polymethyl methacrylate in 10 mL of N,N-dimethylformamide solution, stir overnight until completely dissolved, and apply the solution prepared above evenly on a clean and flat quartz glass plate with a spatula , quickly placed in an oven at 60 °C for 24 ...

Embodiment 2

[0039]Dissolve 0.95 g of polyvinylidene fluoride powder in 10 mL of N,N-dimethylformamide solution, stir overnight until completely dissolved, then add 0.05 g of barium strontium titanate nanoparticles to the above solution, and continue stirring for 1 h After ultrasonic treatment for 30 min until the barium strontium titanate nanoparticles were completely dispersed, the mixed solution prepared above was evenly coated on a clean and flat quartz glass plate with a spatula, and quickly dried in an oven at 60 °C for 24 h to obtain the outer layer It is a film of polyvinylidene fluoride / barium strontium titanate, that is, a dielectrically enhanced film, with a film thickness of 6 μm;

[0040] Dissolve 0.5 g of polycarbonate in 10 mL of N,N-dimethylformamide solution, stir overnight until completely dissolved, apply the above-prepared solution evenly on a clean and flat quartz glass plate with a spatula, and quickly put Dry in an oven at 70 °C for 24 h to obtain a film with a polyc...

Embodiment 3

[0043] Dissolve 0.9 g of polyvinylidene fluoride-chlorotrifluoroethylene powder in 10 mL of N,N-dimethylformamide solution, stir overnight until completely dissolved, then add 0.1 g of titanium dioxide nanoparticles to the above solution, and continue stirring After 1 h, ultrasonic treatment was performed for 30 min until the titanium dioxide nanoparticles were completely dispersed. The mixed solution prepared above was evenly coated on a clean and flat quartz glass plate with a spatula, and quickly dried in an oven at 60 °C for 24 h. The outer layer was obtained. The polyvinylidene fluoride-chlorotrifluoroethylene / titanium dioxide film is a dielectrically enhanced film, and the film thickness is 8 μm;

[0044] Dissolve 1 g of polypropylene in 10 mL of N,N-dimethylformamide solution, stir overnight until completely dissolved, apply the above-prepared solution evenly on a clean and flat quartz glass plate with a spatula, and quickly put it in Dry in an oven at 65 °C for 48 hour...

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Abstract

The invention discloses a composite dielectric material with a three-layer structure. The material comprises dielectric enhancement layers and a voltage-withstanding enhancement layer clamped betweenthe dielectric enhancement layers, the dielectric enhancement layers are made of a ferroelectric polymer / dielectric ceramic filler compound, and the voltage-withstanding enhancement layer is a lineardielectric high-molecular polymer. The invention further provides a preparation method of the composite dielectric material. The preparation method comprises the following steps: S1, dissolving a ferroelectric polymer in N,N-dimethylformamide, adding a dielectric ceramic filler, carrying out ultrasonic dispersion to obtain a mixed solution, coating a quartz glass plate with the mixed solution, andconducting drying and scraping to obtain a dielectric reinforced film; S2, coating the quartz glass plate with the N,N-dimethylformamide solution of the linear dielectric high-molecular polymer, andconducting drying and scraping to obtain a pressure-resistant reinforced film; and S3, clamping the pressure-resistant reinforced film between the dielectric reinforced films, carrying out hot press molding, and conducting cooling to obtain the composite dielectric material with a three-layer structure. The composite dielectric material has high energy storage efficiency and energy storage density.

Description

technical field [0001] The invention relates to the technical field of dielectric energy storage materials, in particular to a composite dielectric material with a three-layer structure and a preparation method thereof. Background technique [0002] Film capacitors have the characteristics of high power density, high charge and discharge efficiency, and stable cycle performance, and play an important role in contemporary electronic power systems. The performance index of film capacitors depends on the key performance parameters of dielectric film materials such as energy storage density, charge and discharge efficiency, etc. Polymer dielectric material has the characteristics of flexibility, light weight, easy processing and excellent high-voltage resistance, and is the main raw material for preparing film capacitors. However, the low energy storage density of polymer dielectric materials limits the further development of film capacitors. The development of efficient and st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B32B27/36B32B27/08B32B37/06B32B37/10C08J5/18C08L27/16C08K3/24C08L33/12C08L69/00C08K3/22C08L23/12C08L25/06B29C41/24B29L7/00
CPCB32B27/304B32B27/36B32B27/08B32B37/06B32B37/10C08J5/18B29C41/24C08K2201/011C08J2327/16C08K3/24C08J2333/12C08J2369/00C08K2003/2241C08J2323/12C08J2325/06B29L2007/00
Inventor 李泽宇朱晓明杨鑫
Owner HUBEI UNIV OF SCI & TECH
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