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BNT-monocrystal-nanowire-based dielectric composite material and preparation method thereof

A technology of single crystal nano and composite materials, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science. , limit the thermal conductivity of the compound and other issues, and achieve the effects of less defects, high energy density, and excellent mechanical properties

Active Publication Date: 2016-08-17
云帆新材料集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the percolation threshold theory, 0-3 type ceramic / polymer composites usually need to compound more than 50vol% ceramic particles to make the dielectric constant of the composite reach the threshold, but the high content of ceramic filling destroys the flexibility of the material on the one hand, On the other hand, due to the inevitable defects and agglomerations, the ability and mechanical properties of the composite to resist the breakdown electric field will be greatly reduced.
Moreover, the 0-dimensional nano-ceramic powder is uniformly dispersed in the polymer body, which cannot form a continuous percolation heat dissipation path, which limits the thermal conductivity of the compound.

Method used

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  • BNT-monocrystal-nanowire-based dielectric composite material and preparation method thereof
  • BNT-monocrystal-nanowire-based dielectric composite material and preparation method thereof
  • BNT-monocrystal-nanowire-based dielectric composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] Hydrothermal Synthesis of BNT Single Crystal Nanowires

[0038] 0.005mol Bi(NO 3 ) 3 ·5H 2 O and 0.01mol NaNO 3 respectively dissolved in 7.5ml CH 3 COOH and 2.5ml deionized water, 0.005mol Ti(OC 4 h 9 ) 4 Dissolve in 10ml CH 3 CH 2 OH, the Bi(NO 3 ) 3 ·5H 2 O solution and NaNO 3 Solution added Ti(OC 4 h 9 ) 4 solution to make a mixed solution. 30ml of 10mol / L NaOH solution was added to the above mixed solution, and magnetically stirred at room temperature for 1h to obtain a uniform precursor solution. Put the precursor solution into a 100ml polytetrafluoroethylene-lined stainless steel reactor, seal it, put it in an incubator at 170°C for 48 hours, and use the pressure spontaneously formed in the reactor to promote the reaction. After the holding time is over, cool down to room temperature naturally. The obtained product was suction-filtered and washed with deionized water, and then dried in a drying oven at 80° C. to obtain BNT single crystal nanowir...

Embodiment 2

[0040] Preparation of dopamine-modified BNT single crystal nanowires and P(VDF-HFP) dielectric composites

[0041]Weigh 2.0 g of the prepared BNT nanowires and disperse them into a 95:5 (v / v) ethanol / water mixed solution, stir and sonicate, collect the precipitate by centrifugation, and vacuum dry to obtain BNT single crystal nanowires with increased surface hydroxyl content. Disperse the hydroxylated BNT single crystal nanowires in 0.01mol / L dopamine hydrochloride aqueous solution, reflux at 60°C for 10h, cool to room temperature, centrifuge, and thoroughly wash with deionized water, collect the powder in a vacuum drying oven for 60 ℃ dry 24h.

[0042] Add 2.37vol%, 5.19vol% and 12.73vol% dopamine-modified BNT single crystal nanowires to the P(VDF-HFP) polymer solution, after ultrasonic dispersion, ball milling for 2 days to further disperse, the dispersed BNT / P The (VDF-HFP) suspension was tape-cast on a clean glass sheet, dried at 80°C for 24 hours to obtain a composite sh...

Embodiment 3

[0044] Electrical Performance Testing of Dielectric Composite Materials

[0045] Design a metal mask with a circular hole diameter of 2 mm and a hole center spacing of 4 mm. The shape of the metal mask is square with a side length of 30 mm. The pressed dielectric composite material is sandwiched between two metal masks, and the gold electrodes are symmetrically sputtered on the upper and lower surfaces, and the sputtering time is 10 minutes on the upper and lower surfaces to ensure that the gold electrodes have sufficient thickness. Using an impedance analyzer to test its capacitance to obtain the dielectric constant, the results are as follows Figure 4 As shown, it can be seen that the dielectric constant of the composite increases with the increase of BNT nanowire content, such as at 1kHz, when the BNT nanowire content in the composite is 0, 2.37, 5.19 and 12.73vol%, respectively The dielectric constants are 6.9, 13.1, 16.9 and 21.7, respectively. Use a ferroelectric anal...

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Abstract

The invention discloses a BNT-monocrystal-nanowire-based dielectric composite material and a preparation method thereof. The preparation method comprises the following steps: preparing a BNT monocrystal nanowire material with the length-diameter ratio of 20-50 by a hydrothermal process, carrying out chemical modification by using dopamine, and compounding with a vinylidene fluoride-hexafluoropropylene P(VDF-HFP) copolymer to obtain the dielectric composite material. On the premise of implementing low ceramic phase content, the dielectric composite material obtains the anti-breakdown electric field of up to 458 kV / mm which is higher than the anti-breakdown electric field of 398 kV / mm of the straight polymer P(VDF-HFP), and implements the high energy density of 12.7 J / cm<3>.

Description

technical field [0001] The invention relates to a dielectric composite material based on BNT single crystal nanowires and a preparation method thereof. Background technique [0002] Energy storage technology is widely used in the electronics industry, among which capacitors are widely used due to their high energy density and fast charging and discharging speed. To achieve higher energy densities, it is crucial to develop dielectric materials with high dielectric constant and high dielectric strength. [0003] Ceramic / polymer nanocomposites are usually of the 0-3 type (0-dimensional structured nano-ceramic powder dispersed in a 3-dimensional interconnected polymer matrix). According to the percolation threshold theory, 0-3 type ceramic / polymer composites usually need to compound more than 50vol% ceramic particles to make the dielectric constant of the composite reach the threshold, but the high content of ceramic filling destroys the flexibility of the material on the one h...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/04C08K7/08C01G23/00B82Y30/00
CPCC01G23/003C01P2004/03C01P2004/16C08K7/08C08K9/04C08L27/16
Inventor 张斗周学凡罗行吴忠周科朝
Owner 云帆新材料集团有限公司
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