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Dielectric composite material based on filler with core-shell structure

A composite material and core-shell structure technology, applied in the field of dielectric composite materials, can solve problems such as crystal structure differences and core-shell interface cracks, reduce interface polarization and remanent polarization, increase energy storage density and efficiency, increase The effect of large resistance to breakdown electric field

Active Publication Date: 2019-11-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, the introduction of low dielectric constant shell ceramics and BaTiO 3 There are large crystal structure differences in the core, and there are defects such as cracks and holes at the core-shell interface, which may serve as additional transport channels for charge carriers and introduce additional interfacial polarization in the dielectric composite

Method used

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  • Dielectric composite material based on filler with core-shell structure
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  • Dielectric composite material based on filler with core-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Example 1: Preparation of BaTiO 3 -SrTiO 3 core shell filler

[0042] The BaTiO 3 -SrTiO 3 The core-shell filler was prepared by a two-step hydrothermal method. 2.1809g of Ba(OH) 2 ·8H 2 O was added to 16mL of 1M acetic acid solution, stirred and dissolved thoroughly to obtain solution 1. Then 0.8 mL of TiCl 4 Added to 16mL absolute ethanol solution to obtain solution 2.

[0043] Mix the solution 1 and the solution 2 to obtain a precursor solution. Then 5.0g flake NaOH was added to the precursor solution, and mechanically stirred for 10min to obtain a mixture containing BaTiO 3 Intermediate suspension of nanoparticles and unreacted gel.

[0044] 0.0967g Sr(OH) 2 ·8H 2 O was dissolved in 24 mL of 1M acetic acid solution to obtain solution 3. The Ba(OH) 2 ·8H 2 O, TiCl 4 and Sr(OH) 2 ·8H 2 The amount of O needs to ensure that the molar ratio of Ba(Sr) to Ti is 1:1.

[0045] Add the solution 3 into the intermediate suspension, stir and mix evenly, transf...

Embodiment 2

[0047] Example 2: Preparation of Dielectric Composite Materials

[0048] 1. Using N,N-dimethylformamide (DMF) as a solvent and commercially available polyvinylidene fluoride-hexafluoropropylene copolymer (hereinafter referred to as P(VDF-HFP)) as a polymer, according to P(VDF -HFP) 1vol%, 2vol% and 3vol% of the volume, respectively weigh three groups of BaTiO prepared in Example 1 3 -SrTiO 3 Core-shell fillers, as experimental groups 1, 2, and 3; were added to DMF solvent, ultrasonically dispersed for 30 minutes, and stirred for 2 hours to fully disperse and evenly.

[0049] Then, in each group of solvents, add the required mass of solid P(VDF-HFP) respectively, stir at 50°C for 12h, and sonicate for 1h to obtain BaTiO with good dispersibility. 3 -SrTiO 3 Core-shell filler / P(VDF-HFP) solution.

[0050] It should be understood that, as described above to obtain BaTiO 3 -SrTiO 3 For the core-shell filler / P(VDF-HFP) solution, those skilled in the art can choose a further dr...

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Abstract

The invention belongs to the field of dielectric composite materials, and particularly relates to a dielectric composite material based on a filler with a core-shell structure. The specific technicalsolution of the invention is as follows: the dielectric composite material comprises a ceramic material and a polymer, and the ceramic material is of a core-shell structure in which the shell structure has a lower dielectric constant than the core structure. The invention breaks through a traditional research idea by which surface of barium titanate is coated, and uses barium titanate in paraelectric phase as a shell layer to prepare the BaTiO3-SrTiO3 composite core-shell filler through two-step hydrothermal method, and then combines with a polymer matrix to prepare the dielectric composite material, thereby reducing interfacial polarization and residual polarization of the composite material, increasing anti-breakdown electric field, and further greatly improving energy storage density and efficiency of the dielectric composite material. The dielectric composite material provided by the present invention can be widely used in various capacitors.

Description

technical field [0001] The invention belongs to the field of dielectric composite materials, and in particular relates to a dielectric composite material based on a core-shell structure filler. Background technique [0002] In recent years, with the rapid development of electronic technology, capacitors are widely used in high-power devices because of their ultra-high power density, such as laser guns, radars, rail guns, electric shock generators and space stations. However, compared with electrochemical energy storage devices such as fuel cells, lithium-ion batteries, and supercapacitors, capacitors still have the disadvantage of low energy density, which makes the electronic components used in them large, heavy, and expensive, which limits their applications. and development. Therefore, increasing the energy density of capacitors and miniaturizing devices has always been the direction of researchers' efforts. [0003] As an important part of capacitors, dielectric materi...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/24C08L27/16C08L27/20
CPCC08K3/24C08K9/10C08L27/16C08L27/20
Inventor 张斗马玉鹏罗行党锋郭茹
Owner CENT SOUTH UNIV
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