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An organic/inorganic ferroelectric composite material with ultra-high dielectric constant, its preparation method and application

A composite material and dielectric constant technology, applied in the direction of electrolytic capacitors, capacitor electrolytes/absorbents, circuits, etc., can solve problems such as difficulty in meeting conventional circuit requirements, complex processes, and comparable dielectric properties, and achieve easy mass industrialization The effect of simple production and operation and low price

Inactive Publication Date: 2020-09-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The apparent dielectric constant of such capacitors can be as high as 10 4 However, due to the semiconducting characteristics of the material itself, the leakage current is large, and it will break down at a lower voltage. The process is extremely complicated, and it is difficult to meet the needs of conventional circuits.
People's enthusiasm for high dielectric constant materials continues. In the past few years, it was found that calcium copper oxide titanium (CCTO) has a very high dielectric constant, and its dielectric constant can be as high as 10. 4 Above, this material has attracted widespread attention and in-depth research. However, this material itself is a semiconductor, and its dielectric properties are even difficult to match with BLC. It is still in the research stage so far.

Method used

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  • An organic/inorganic ferroelectric composite material with ultra-high dielectric constant, its preparation method and application
  • An organic/inorganic ferroelectric composite material with ultra-high dielectric constant, its preparation method and application
  • An organic/inorganic ferroelectric composite material with ultra-high dielectric constant, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Weigh 0.2g PVDF and 0.2g DIPAB into a beaker, then add 20ml of absolute ethanol, and stir vigorously to obtain a clear PVDF / DIPAB mixed solution as an organic matrix solution. Then add 1.6g of BaTiO to the solution 3 Nano powder. Add a layer of plastic wrap on the beaker, after ultrasonic vibration for 30min, BaTiO 3 The powder was suspended in an absolute ethanol solution of PVDF and DIPAB. After removing the plastic wrap, the beaker was placed in a drying oven at 80°C for 24 hours to dry to obtain a white composite material powder. Its XRD such as figure 1 In (d) shown. It can be seen that in the XRD of the composite material powder, the XRD diffraction peaks of the three ferroelectrics exist at the same time, and the peak of the PVDF polymer is weaker, which is determined by its own crystallization status and its content is low. The ultra-high dielectric constant composite material powder is placed between two layers of aluminum foil, and pressed at room temperat...

Embodiment 2

[0050] Nano BaTiO used 3 Powder, DIPAB and PVDF are the same as in Example 1. Nano-BaTiO obtained by direct solution synthesis 3 The powder was pre-fired at 800°C for 2 hours to make it ferroelectric, from figure 2 It can be seen that the size of the powder particles increases with the increase of the treatment temperature for the three samples with different treatment temperatures. For BaTiO 3 Nanoparticles, the scanning electron microscope SEM photo of this example is as follows figure 2 In (b) shown. Weigh 0.2g of PVDF and 0.2g of DIPAB into a beaker, then add 20ml of absolute ethanol, and stir vigorously to obtain a clear PVDF / DIPAB mixed solution as an organic matrix solution. Then add 1.6g of BaTiO pre-fired at 800°C to the solution 3 Nano powder. Add a layer of plastic wrap on the beaker, after ultrasonic vibration for 30min, BaTiO 3 The powder was suspended in an absolute ethanol solution of PVDF and DIPAB. After removing the plastic wrap, the beaker was pla...

Embodiment 3

[0052] Nano BaTiO used 3 Powder, DIPAB and PVDF are the same as in Example 1. Nano-BaTiO obtained by direct solution synthesis 3 The powder was pre-fired at 800°C for 2 hours. Weigh 0.3g PVDF and 0.3g DIPAB into a beaker, then add 20ml of absolute ethanol, and stir vigorously to obtain a clear PVDF / DIPAB mixed solution as an organic matrix solution. Then add 1.4g of BaTiO pre-fired at 800°C to the solution 3 Nano powder. Add a layer of plastic wrap on the beaker, after ultrasonic vibration for 30min, the BaTiO 3 The powder was suspended in an absolute ethanol solution of PVDF and DIPAB, and after the plastic wrap was removed, the beaker was placed in a drying oven at a temperature of 80°C for 24 hours to obtain a white composite material powder. The ultra-high dielectric constant composite material powder is placed between two layers of aluminum foil, and pressed into a required sheet with a pressure of 100 MPa, wherein the aluminum foil is used as the electrode material....

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Abstract

The present invention relates to an organic / inorganic ferroelectric composite material having an ultrahigh dielectric constant, a preparation method therefor, and use thereof. A novel organic / inorganic ferroelectric composite material is formed by filling, in a matrix composite formed by organic ferroelectric macromolecules and ferroelectric high-molecular polymers, inorganic powder having a ferroelectric property. At room temperature, said material has a relative dielectric constant of greater than 105 at a power frequency. Said preparation method has simple operation, low cost, and is easy for large-scale industrial production. The novel ultrahigh dielectric material can be used for preparing a high-capacity all-solid novel capacitor material suitable for surface mounting. Said material has multiple types of interfacial charge polarization, which breaks through the pre-percolation theory of the currently available dielectric theory, and provides a new approach for material application and further research.

Description

technical field [0001] The invention relates to an organic / inorganic ferroelectric composite material with an ultrahigh dielectric constant, a preparation method and application thereof, and belongs to the technical field of high dielectric material preparation. Background technique [0002] Large-capacity capacitors are indispensable electronic components in the modern electronics industry. Electrolytic capacitors are the most representative ones. They are widely used in household appliances and various electronic products. Their capacity ranges from 1 to 3300 μF. , The rated operating voltage range is 6.3 ~ 700V. Generally speaking, electrolytic capacitors use metal foil (aluminum or tantalum) as the positive electrode, and the oxide film (aluminum oxide or tantalum pentoxide) that is close to the metal with the positive electrode is the dielectric, and the negative electrode is made of conductive material, electrolyte (which can be liquid or solid) and Composed of other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/025H01G9/028H01G9/032
CPCH01G9/025H01G9/028H01G9/032
Inventor 齐建全常娟雄马振伟韩秀梅汪晋宽王亭惠姜茂成程静周吉祥李梦莹王佳孙金月吴晶晶张君孙晴雯李妍
Owner NORTHEASTERN UNIV LIAONING
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