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High-energy density polymer composite dielectric and preparation method thereof

A high energy storage density, polymer technology, applied in the field of dielectric materials and energy storage materials preparation, can solve the problems of reduced breakdown strength of composite materials, limitation of energy storage density of composite materials, increase of dielectric loss, etc., to improve dispersion , reduce internal defects, reduce the effect of dielectric loss

Active Publication Date: 2017-03-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the incompatibility of most high dielectric constant ceramic particles with the polymer matrix
Especially when the size of the ceramic particles is reduced to the nanometer scale, it is very easy to agglomerate in the polymer, resulting in a significant decrease in the breakdown strength of the composite material and a substantial increase in the dielectric loss, which limits the increase in the energy storage density of the composite material.

Method used

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  • High-energy density polymer composite dielectric and preparation method thereof
  • High-energy density polymer composite dielectric and preparation method thereof
  • High-energy density polymer composite dielectric and preparation method thereof

Examples

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Embodiment 1

[0044] This embodiment relates to a high energy storage density polymer composite dielectric, the composite material is composed of 97.5% mass fraction of PVDF as a matrix and 2.5% mass fraction of 2-amino-3-(3,4-dihydroxyphenyl) Titanium dioxide nanosheets modified with propionic acid-1H, 1H, 2H, 2H-perfluorodecyl ester were used as fillers. Wherein 2-amino-3-(3,4-dihydroxyphenyl)propionic acid-1H, 1H, 2H, 2H-perfluorodecyl ester modified titanium dioxide nanosheets were prepared by the following steps:

[0045] A. Titanium dioxide nanosheets: synthesized according to the method reported in the literature (X.G.Han, et al., J.Am.Chem.Soc., 2009, 131, 3152.);

[0046] B. Dopamine with long-chain structure: 1H, 1H, 2H, 2H-perfluorodecanol reacts with L-3,4-dihydroxyphenylalanine to obtain 2-amino-3-(3,4-dihydroxyl Phenyl)propionic acid-1H,1H,2H,2H-perfluorodecyl ester. This long-chain structure of dopamine was synthesized using the method in the literature (Manolakis, I. et al...

Embodiment 2

[0054] This embodiment relates to a high energy storage density polymer composite dielectric, the composite material is composed of 85% mass fraction of P(VDF-HFP) as a matrix and 15% mass fraction of 2-amino-3-(3,4- The barium titanate nanowires modified with decyl dihydroxyphenyl)propionate were used as fillers. The barium titanate nanowires modified with decyl 2-amino-3-(3,4-dihydroxyphenyl) propionate were prepared through the following steps.

[0055] A, barium titanate nanowires: synthesized according to the method reported in the literature (G.Y.Wang, et al., ACS Applied Materials & Interfaces 2015, 7, 18017);

[0056] B. Dopamine with long-chain structure: 1-decanol reacts with L-3,4-dihydroxyphenylalanine to obtain 2-amino-3-(3,4-dihydroxyphenyl)propionic acid decyl ester. This long-chain structure of dopamine was synthesized using the method in the literature (Manolakis, I. et al., Macromol. Rapid Commun. 2014, 35, 71-76.).

[0057] C. Dopamine-modified barium tita...

Embodiment 3

[0064] This embodiment relates to a high energy storage density polymer composite dielectric, the composite material is composed of 75% mass fraction of P(VDF-TrFE) as a matrix and 25% mass fraction of 2-amino-3-(3,4 -Dihydroxyphenyl) propionate modified copper calcium titanate nanowires as filler composition. Wherein the preparation steps of 2-amino-3-(3,4-dihydroxyphenyl) propionate-modified copper calcium titanate nanowires are the same as those in Example 2, the difference is: the high dielectric constant used The nanofillers are copper calcium titanate nanowires. The synthesis of such copper calcium titanate nanowires adopts the method in the modified literature (H.X.Tang, et al., NanoEnergy 2015, 17, 302-307.).

[0065] The present embodiment also relates to a method for preparing a high energy storage density polymer composite dielectric, the method comprising the following steps:

[0066] Step 1, adding 3.75 g of the fluorine-containing ferroelectric polymer matrix t...

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Abstract

The invention discloses a high-energy density polymer composite dielectric and a preparation method thereof. The composite dielectric comprises, by mass, 55-97.5% of a fluorine-containing ferroelectric polymer matrix and 45-2.5% of a dopamine modified high-dielectric constant nanofiller. The preparation method comprises solution blending, film casting and hot press molding. High-dielectric constant nanoparticles are grafted and modified with dopamine having a long chain structure, and the dopamine having a long chain structure improves the dispersion of the high-dielectric constant nanoparticles, has good compatibility with the fluorine-containing ferroelectric polymer matrix and enhances the interface combination force between the polymer matrix and the high-dielectric constant nanoparticle filler. The high-energy density polymer composite dielectric prepared in the invention has the characteristics of light weight, good flexibility and high energy density, and is suitable for producing high-energy density capacitors, embedded capacitors, field effect transistors and other advanced electronic and electric devices.

Description

technical field [0001] The invention belongs to the technical field of preparation of dielectric materials and energy storage materials, in particular to a high energy storage density polymer composite dielectric and a preparation method thereof. Background technique [0002] Dielectric materials with high energy storage density are widely used in electronic and electrical equipment such as mobile energy storage capacitors, embedded capacitors, cable terminals, and field effect transistors. At present, electronic devices are developing in the direction of integration and miniaturization, and the preparation of dielectrics with high energy storage density is one of the key ways to reduce the volume of electronic devices and improve the integration degree. [0003] According to the dielectric theory, the maximum energy storage density of a dielectric material can be obtained by the formula: U max =0.5ε 0 ε r E b 2 Calculation. where ε 0 is the vacuum permittivity, ε r ...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/10C08K3/22C08K3/24C08K7/00C08J5/18
CPCC08J5/18C08J2327/16C08K3/22C08K3/24C08K7/00C08K9/10C08K2003/2241C08K2201/011C08L27/16
Inventor 黄兴溢江平开王官耀贾庆朝张强
Owner SHANGHAI JIAO TONG UNIV
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