Laminated-structure ferroelectric polymer-base dielectric film as well as preparation method and application of dielectric film

A ferroelectric polymer, laminated structure technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problem that the solution method is not suitable for large-scale production, and achieve excellent energy storage performance, The effect of small dielectric loss and high energy storage efficiency

Active Publication Date: 2018-01-12
TSINGHUA UNIV
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  • Claims
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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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  • Laminated-structure ferroelectric polymer-base dielectric film as well as preparation method and application of dielectric film
  • Laminated-structure ferroelectric polymer-base dielectric film as well as preparation method and application of dielectric film
  • Laminated-structure ferroelectric polymer-base dielectric film as well as preparation method and application of dielectric film

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preparation example Construction

[0045] The present invention also provides a method for preparing the laminated ferroelectric polymer-based dielectric film according to the present invention, which includes the following steps:

[0046] Step 1), by subjecting the alkaline solution containing Al salt to hydrothermal reaction, the inorganic substance AlOOH is obtained;

[0047] Step 2), mixing the inorganic substance AlOOH and the vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP) in an organic solvent according to the proportion to obtain an electrospinning solution 1; Ethylene-hexafluoropropylene copolymer P(VDF-co-HFP) was dissolved in an organic solvent to obtain an electrospinning solution 2;

[0048] Step 3), the electrospinning solution 1 and the electrospinning solution 2 are alternately subjected to high-voltage electrospinning to obtain a non-woven spinning body with a laminated structure;

[0049] Step 4), hot pressing the non-woven spinning body of the laminated structure, naturally c...

Embodiment 1

[0063] 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 dosed according to 99vol%P(VDF-co-HFP)-1vol%AlOOH (x=1), wherein each gram of solid powder corresponds to 5ml of mixing The ratio of solvents is to use acetone and N,N-dimethylacetamide (DMA) as a mixed solvent, stir for 10 hours to make spinning solution 1 for later use, and the ratio of acetone and DMA in the mixed solvent is 2:3.

[0064] According to the ratio of 5 ml of mixed solvent per gram of solid powder, P(VDF-co-HFP) was added to the mixed sol...

Embodiment 2

[0069] 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 20 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 dosed according to 90vol% P(VDF-co-HFP)-10vol% AlOOH (x=10), wherein each gram of solid powder corresponds to 5 ml of mixing The ratio of solvents is to use acetone and N,N-dimethylformamide (DMF) as a mixed solvent. After stirring for 10 hours, the spinning solution 1 is prepared for use. The ratio of acetone and DMF or DMA in the mixed solvent is 2:3.

[0070] According to the ratio of 5 ml of mixed solvent per gram of solid powder, P(VDF-co-HFP) was a...

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Abstract

The invention relates to a laminated-structure ferroelectric polymer-base dielectric film as well as a preparation method and application of the dielectric film. The film at least comprises two firstdielectric layers and a second dielectric layer located between the two first dielectric layers, wherein the first dielectric layers contain a vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP) and an inorganic substance AlOOH, the volume percentage ratio of the copolymer and the inorganic substance is (100-x)% of P(VDF-co-HFP)-x% of AlOOH, wherein x is more than 0 and less than or equal to 10; and the second dielectric layer contains vinylidene fluoride-hexafluoropropylene copolymer P(VDF-co-HFP). The laminated-structure ferroelectric polymer-base dielectric film has high breakdown field strength, energy storage density and energy storage efficiency, is free from lead and environmentally friendly, has 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 with a laminated structure, a preparation method and application thereof, and belongs to the field of dielectric materials. Background technique [0002] Compared with electrochemical-based energy storage devices such as supercapacitors and lithium batteries, energy storage devices based on dielectric capacitors have the advantages of higher power density, lower loss, and higher operating voltage. Therefore, dielectric capacitors are not only important basic electronic components, but also widely used in basic energy storage devices in electronic power systems and energy systems. [0003] 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. The low energy storage density of polymers has become a bottleneck for its further developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/02B32B27/12B32B27/30
Inventor 曾一林元华
Owner TSINGHUA UNIV
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