Method for improving breakdown strength and energy storage density of dielectric composite material

A technology of composite materials and breakdown strength, which is applied in the field of improving the breakdown strength and energy storage density of dielectric composite materials, can solve the problems of deterioration of electrical breakdown performance of composite films, improve interfacial compatibility, and improve dispersion controllability And the effect of stability and high energy storage density

Active Publication Date: 2017-09-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The surface modifier coats the inorganic nanofiller to form an organic shell, which improves the interfacial compatibility between the inorganic nanofiller and the polymer matrix, reduces the interface defects between the filler an

Method used

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  • Method for improving breakdown strength and energy storage density of dielectric composite material
  • Method for improving breakdown strength and energy storage density of dielectric composite material
  • Method for improving breakdown strength and energy storage density of dielectric composite material

Examples

Experimental program
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Example Embodiment

[0067] Example 1

[0068] BaTiO 3 Hydroxylation: Weigh 3g of dried BaTiO 3 Add 70ml of hydrogen peroxide to a three-necked round-bottom flask, and ultrasonically disperse for half an hour. The reaction system is magnetically stirred in an oil bath at 106°C and heated to reflux for 6 hours. After the reaction is completed, cool to room temperature and centrifuge with a low-speed centrifuge (3000r, 10min). After centrifugation and washing twice with deionized water, the obtained product was dried at 80°C for 12 hours. Grind to get BaTiO 3 -OH;

[0069] TC-2 surface coating modification: weigh 1g of BaTiO 3 -OH powder was placed in a three-necked round-bottomed flask, dissolved in 80ml isopropanol, stirred for 30min while ultrasonic to promote its dissolution, added dropwise 0.1ml TC-2 magnetic stirring and refluxed under 70℃ oil bath for 2h, after the reaction was cooled to The product was centrifuged at room temperature at low speed, washed once with deionized water, washed twice w...

Example Embodiment

[0071] Example 2

[0072] BaTiO 3 Hydroxylation: Weigh 3g of dried BaTiO 3 Add 70ml of hydrogen peroxide to a three-necked round-bottom flask, and ultrasonically disperse for half an hour. The reaction system is magnetically stirred in an oil bath at 106°C and heated to reflux for 6 hours. After the reaction is completed, cool to room temperature and centrifuge with a low-speed centrifuge (3000r, 10min). After centrifugation and washing twice with deionized water, the obtained product was dried at 80°C for 12 hours. Grind to get BaTiO 3 -OH;

[0073] TC-2 surface coating modification: weigh 1g of BaTiO 3 -OH powder was placed in a three-necked round-bottomed flask, dissolved in 80ml isopropanol, stirred for 30min while ultrasonic to promote its dissolution, added dropwise 0.1ml TC-2 magnetic stirring and refluxed under 70℃ oil bath for 2h, after the reaction was cooled to The product was centrifuged at room temperature at low speed, washed once with deionized water, washed twice w...

Example Embodiment

[0079] Example 3

[0080] Weigh 0.01204g of unmodified BT nanoparticles and add them to 4ml DMF and ultrasonically disperse them until the nanofillers form a stable suspension in the solvent; add 0.5g PVDF to the above suspension while stirring, and then place it at 30°C overnight Stir to dissolve completely. Stir evenly and cast on a dry and clean glass plate to form a film. Place the composite film cast by the solution in an oven and dry it at 60-80°C to completely volatilize the solvent. The composite film BT / PVDF with a filler content of 2 vol% was obtained.

[0081] The added amount of BT particles was changed to prepare BT-PVDF composite films with filling amounts of 2%, 4%, 6%, 8%, and 10% respectively.

[0082] Observe the composite film with scanning electron microscope, such as Figure 4 As shown in (a), it is found that the BT particles agglomerate seriously in the PVDF matrix. The electrical breakdown performance and energy storage density of the composite film are tes...

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Abstract

The invention provides a method for improving the breakdown strength and the energy storage density of a dielectric composite material, and belongs to the technical field of dielectric energy storage materials. A composite dielectric film is produced through filler pretreatment and coating of a nano-filler with a surface modifier, the dielectric composite material is composed of a modified inorganic nano-filler and a polymer matrix, and the inorganic nano-filler is coated with the surface modifier to form an organic shell layer, so the interface compatibility of the inorganic nano-filler and the polymer matrix is improved, the interface defects between the filler and the polymer matrix are reduced, the problem of deterioration of the electric breakdown performance of the composite film with the increase of the filler is effectively solved, and the energy storage density is correspondingly improved.

Description

technical field [0001] The invention relates to the technical field of dielectric energy storage materials, in particular to a method for improving the breakdown strength and energy storage density of dielectric composite materials. Background technique [0002] With the development of the electronics industry, people pay more and more attention to dielectric materials with high energy storage density. One of the two parameters that restricts the material energy storage density is the dielectric constant (ε), and the other is the electrical breakdown strength (E b ). Inorganic dielectric materials usually have a high dielectric constant, but their processing performance is poor and their application range is limited; although polymer materials have good processing performance, their dielectric constant is low. Therefore, it is possible to combine the polymer matrix with the inorganic dielectric filler to prepare a composite material with a higher energy storage density to ...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K9/02C08K9/04C08K3/24C08L27/16C08J5/18
CPCC08J5/18C08J2327/16C08K3/24C08K9/02C08K9/04C08K9/10C08K2201/011C08L2203/16C08L2203/20C08L27/16
Inventor 胡澎浩张洋洋高胜敏王鹏
Owner UNIV OF SCI & TECH BEIJING
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