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A kind of high energy storage density dielectric composite multilayer film and its preparation method

A high energy storage density, multi-layer film technology, applied in the direction of coating, can solve the problem of unsatisfactory effect and other problems, and achieve the effect of remarkable thermal oxidation stability, small dielectric, and good thermal conductivity

Active Publication Date: 2021-02-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Among the numerous dielectric materials, polymer nanocomposites are promising materials because they can easily combine the high εr of the ferroelectric ceramic filler with the high Eb of the polymer matrix to obtain high The total energy density of , however, faces the dilemma that the increase in εr in nanocomposites is often at the expense of Eb reduction, which inhibits the realization of high Ue
To solve this problem, many innovative approaches have been adopted, including the utilization of fillers in core-shell structures, surface-functionalized nanofillers, and multi-nanofillers with synergistic functions, but the results have not been very satisfactory so far.

Method used

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  • A kind of high energy storage density dielectric composite multilayer film and its preparation method
  • A kind of high energy storage density dielectric composite multilayer film and its preparation method
  • A kind of high energy storage density dielectric composite multilayer film and its preparation method

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preparation example Construction

[0043] A method for preparing a high energy storage density dielectric composite multilayer film, comprising the following steps:

[0044] (1) Dissolve 0.5-0.8g of PEI into 4-8g of N-methyl-2-pyrrolidone solution, stir with a magnetic stirrer at 40-60°C and 300-700 rpm for 2-8 hours, Get mixed solution A for later use;

[0045] (2) Dissolve 0.4-0.7g of PVDF into 1-3g of N,N-dimethylformamide, stir with a magnetic stirrer at room temperature and at a speed of 500-2000 rpm for 2-8 hours to obtain Mixture B is for later use;

[0046] (3) to AgNO 3 The solution (mass fraction is 3-5%) is slowly added dropwise with NH 3 ·H 2 O solution (mass fraction is 20 ~ 30%) uniform transparent colorless silver ammonia solution; then weigh glucose, deionized water, absolute ethanol and pour them into an empty beaker and stir evenly to form a uniform transparent colorless glucose solution (mass fraction is 4~6%), then the prepared silver ammonia solution, BaTiO 3 Pour the nanoparticles in...

Embodiment 1

[0054] Preparation of Ag@BaTiO 3 The volume fraction of nanoparticles is 1vol% dielectric material PEI-Ag@BT / PVDF-PEI, the steps are as follows:

[0055] (1) Dissolve 0.5g of PEI into 4g of N-methyl-2-pyrrolidone solution, stir with a magnetic stirrer at 40°C and 300 rpm for 2 hours to obtain mixed solution A for later use;

[0056] (2) Dissolve 0.4g of PVDF into 1g of N,N-dimethylformamide, and stir with a magnetic stirrer at room temperature and 500 rpm for 8 hours to obtain a mixed solution B for later use;

[0057] (3) to AgNO 3 Solution (mass fraction is 3%) slowly drop NH 3 ·H 2 O solution (mass fraction is 20%) uniform transparent colorless silver ammonia solution; Then take glucose, deionized water, dehydrated alcohol and pour into empty beaker successively and stir, form uniform transparent colorless glucose solution (mass Fraction is 4%), then the prepared silver ammonia solution, BaTiO 3 The nanoparticles were poured into it; then the mixture was magnetically s...

Embodiment 2

[0064] Preparation of Ag@BaTiO 3 The volume fraction of nanoparticles is 3vol% dielectric material PEI-Ag@BT / PVDF-PEI, the steps are as follows:

[0065] (1) Dissolve 0.6g PEI into 5g of N-methyl-2-pyrrolidone solution, stir with a magnetic stirrer at 50°C and 400 rpm for 4 hours to obtain mixed solution A for later use;

[0066] (2) Dissolve 0.5g of PVDF into 2g of N,N-dimethylformamide, and stir with a magnetic stirrer at room temperature and 1500 rpm for 3 hours to obtain a mixed solution B for later use;

[0067] (3) to AgNO 3 Solution (mass fraction is 4%) slowly drop NH 3 ·H 2 O solution (mass fraction is 25%) uniform transparent colorless silver ammonia solution; Then take glucose, deionized water, absolute ethanol and pour into empty beaker successively and stir, form uniform transparent colorless glucose solution (mass Fraction is 5%), then the prepared silver ammonia solution, BaTiO 3 The nanoparticles were poured into it; then the mixture was magnetically stirr...

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Abstract

The invention belongs to the field of film materials, and discloses a dielectric composite multilayer film with high energy storage density and a preparation method thereof. The composite multilayer film comprises a top layer, a middle layer and a bottom layer, wherein the top layer and the bottom layer are both made of PEI; the middle layer is made of PVDF, the middle layer is filled with Ag-coated nano BaTiO3 particles, the maximum energy storage performance of the composite multilayer film reaches 20.6-21.3 J / cm<3> under the electric field intensity of 500-650 MV / m, and the maximum energy storage efficiency reaches 80-82%. Meanwhile, the invention also discloses a preparation method of the composite multilayer film. According to the invention, the energy storage density, the energy storage efficiency, the breakdown field intensity and the temperature stability of the dielectric material are effectively improved.

Description

technical field [0001] The invention belongs to the field of film materials, and more specifically relates to a high energy storage density dielectric composite multilayer film and a preparation method thereof. Background technique [0002] In order to meet the increasing demand for electrical energy, the development of energy storage devices has received extensive attention. Among the existing electrical energy storage devices, dielectric capacitors are the only electrical energy storage devices that simultaneously possess the advantages of ultrafast charge and discharge capability, high operating voltage, and ultrahigh power density. Therefore, developing high-efficiency dielectric capacitors has become a goal of modern electronic devices or power systems, such as high-frequency inverters, medical equipment, pulse power generation, power factor correction, and hybrid vehicles. [0003] However, the average low energy density of dielectric capacitors compared with batterie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08L27/16C08K9/10C08K3/22C08K3/08C08J7/046C08J5/18
CPCC08J5/18C08J7/042C08J2379/08C08J2427/16C08K9/10C08K2003/0806C08K2003/2237C08K2201/011
Inventor 张海波范鹏元莫辛·阿里·马瓦特刘凯
Owner HUAZHONG UNIV OF SCI & TECH
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