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Ferroelectric polymer based dielectric film, preparation method and use thereof

A ferroelectric polymer, dielectric film technology, applied in fixed capacitor dielectrics, circuits, capacitors, etc., can solve the problem that the solution method is not suitable for large-scale production, and achieve excellent energy storage performance, high energy storage density, small dielectric The effect of loss

Active Publication Date: 2018-02-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solution method used in the preparation of these materials is not suitable for large-scale production

Method used

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  • Ferroelectric polymer based dielectric film, preparation method and use thereof
  • Ferroelectric polymer based dielectric film, preparation method and use thereof
  • Ferroelectric polymer based dielectric film, preparation method and use thereof

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preparation example Construction

[0038] The present invention also provides a method for preparing the ferroelectric polymer-based dielectric thin film according to the present invention, which includes the following steps:

[0039] Step 1), by subjecting the alkaline solution containing Al salt to hydrothermal reaction, the inorganic substance AlOOH is obtained;

[0040] Step 2), mixing the inorganic substance AlOOH and the vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP) in an organic solvent according to the ratio to obtain an electrospinning solution;

[0041] Step 3), subjecting the electrospinning solution to high-voltage electrospinning to obtain a non-woven spinning body;

[0042] Step 4), hot pressing the non-woven spinning body, naturally cooling to room temperature, and then quenching to obtain a ferroelectric polymer-based dielectric film.

[0043] In the method for preparing a ferroelectric polymer-based dielectric thin film of the present invention, the pH of the alkaline solutio...

Embodiment 1

[0053] AlCl 3 ·6H 2 O, NaOH, NH 3 OH is prepared as a 1M solution in deionized water, and then NaOH and NH 3 OH mixed solution gradually and slowly drop into AlCl 3 solution, until the pH value of the solution = 10, the solution was transferred to a polytetrafluoroethylene-lined reaction kettle, kept in an oven at 200°C for 17 hours, and the precipitate was obtained after natural cooling, and deionized water and ethanol were used to Wash the precipitate repeatedly until the pH value is neutral, and the dried precipitate is formulated according to 98.32vol% P(VDF-co-HFP)-1.68vol% AlOOH (x=1.68), and stirred for 12 hours with acetone as the solvent After that, it is made into spinning solution for later use. The ratio of solute (grams) to solution (ml) ranges from 1:5.

[0054] A homogeneous spun body of polymer nanofilaments was prepared by high-voltage electrospinning. The parameters of the high-voltage electrospinning are: the positive and negative voltage difference is...

Embodiment 2

[0058] AlCl 3 ·6H 2 O, NaOH, NH 3 OH is prepared as a 1M solution in deionized water, and then NaOH and NH 3 OH mixed solution gradually and slowly drop into AlCl 3 solution, until the pH value of the solution = 10, the solution was transferred to a polytetrafluoroethylene-lined reaction kettle, kept in an oven at 200°C for 17 hours, and the precipitate was obtained after natural cooling, and deionized water and ethanol were used to Wash the precipitate repeatedly until the pH value is neutral. The dried precipitate is formulated according to 90vol% P(VDF-co-HFP)-10vol% AlOOH (x=10), and stirred for 12 hours with acetone as the solvent. It is ready for use as spinning solution. The ratio of solute (grams) to solution (ml) ranges from 1:5.

[0059] A homogeneous spun body of polymer nanofilaments was prepared by high-voltage electrospinning. The parameters of the high-voltage electrospinning are: the positive and negative voltage difference is 6 kV; the rotation speed of ...

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Abstract

The invention relates to a ferroelectric polymer based dielectric film, a preparation method and use thereof. The ferroelectric polymer based dielectric film provided by the invention contains a vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP) and an inorganic matter AlOOH, wherein the volume percentage ratio of the two is (100-x)%P(VDF-co-HFP)-x%AlOOH, and x is greater than 0 and smaller than or equal to 10. The ferroelectric polymer based dielectric film provided by the invention has the advantages of high breakdown field strength, high energy storage density and high energy storage efficiency, no lead, environmental protection, and excellent energy storage performance, and is suitable for the high-density energy storage field.

Description

technical field [0001] The invention relates to a ferroelectric polymer-based dielectric thin film, a preparation method and application thereof, and belongs to the field of dielectric materials. Background technique [0002] Dielectric capacitors are the main passive energy storage devices with fast charging and discharging speeds and ultra-high power density. They are widely used in electronic circuits and can realize DC blocking, coupling, bypass, filtering, tuning loops, energy conversion, etc. Features. However, its low energy storage density has become a bottleneck for its further development and application. The energy storage density of current commercial polymer-based dielectric materials such as BOPP is only ~2J / cm 3 , one to two orders of magnitude lower than electrochemical capacitors or batteries. Therefore, exploring dielectric materials with high energy storage density has been a research hotspot in this field. [0003] Ceramic dielectrics have a large die...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K3/22H01G4/20
CPCC08J5/18C08J2327/16C08K3/22C08K2003/2227C08K2201/001H01G4/206C08L27/16
Inventor 曾一林元华
Owner TSINGHUA UNIV
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