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A kind of high energy density sandwich structure flexible composite material and preparation method thereof

A high energy density, composite material technology, applied in the field of high energy density sandwich structure flexible composite material and its preparation, can solve the problems of reduced comprehensive performance, mismatched dielectric properties, etc., to improve energy storage density, avoid breakdown, The effect of improving dielectric constant and breakdown field strength

Active Publication Date: 2019-10-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dielectric constants of polymers and ceramic materials that have attracted much attention from researchers are very different, and there may be a mismatch of dielectric properties during compounding, resulting in a reduction in overall performance

Method used

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  • A kind of high energy density sandwich structure flexible composite material and preparation method thereof
  • A kind of high energy density sandwich structure flexible composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, polyvinylidene fluoride (PVDF) is used as the polymer plate 11 and the blank polymer plate 2, and two-dimensional structure sodium niobate (NaNbO 3 ) is a two-dimensional material 12. In this embodiment, the volume fraction of the two-dimensional material 12 in the upper and lower layers of the flexible composite film material is 1%, the overall thickness of the composite material is 15 microns, and each of the upper, middle and lower layers is 5 microns.

[0033] The preparation method of the flexible composite material is as follows:

[0034] (1) Weigh the sodium niobate nanometer two-dimensional structure ceramics into a beaker with 15mL of N,N-dimethylformamide, sonicate for 5 minutes, and then magnetically stir for 1 hour at room temperature to form a uniformly dispersed suspension. turbid liquid;

[0035] (2) Weigh the polyvinylidene fluoride powder according to a certain volume ratio and add it to the above-mentioned suspension and water res...

Embodiment 2

[0041] In this embodiment, polyvinylidene fluoride (PVDF) is used as a polymer plate and a blank polymer plate, and two-dimensional structure sodium niobate (NaNbO 3 ) is a two-dimensional material. In this embodiment, the volume fraction of the filler in the outermost two layers of the flexible composite film material is 3%, and the volume fraction of the filler in the middle layer is 0%. The overall thickness of the composite is 15 microns, with each of the upper, middle and lower layers being 5 microns.

[0042] The preparation method of the flexible composite material is as follows:

[0043] (1) Weigh the sodium niobate nanometer two-dimensional structure ceramic split into a beaker with 15mL N,N-dimethylformamide, ultrasonicate for 5 minutes, and then magnetically stir at room temperature for 1 hour to form a uniformly dispersed suspension. turbid liquid;

[0044] (2) Weigh the polyvinylidene fluoride powder according to a certain volume ratio and add it to the above-m...

Embodiment 3

[0050] In this embodiment, polyvinylidene fluoride (PVDF) is used as a polymer plate and a blank polymer plate, and two-dimensional structure sodium niobate (NaNbO 3 ) is a two-dimensional material. In this embodiment, the volume fraction of the filler in the outermost two layers of the flexible composite film material is 5%, and the volume fraction of the filler in the middle layer is 0%. The overall thickness of the composite is 15 microns, with each of the upper, middle and lower layers being 5 microns.

[0051] The preparation method of the flexible composite material is as follows:

[0052] (1) Weigh the sodium niobate nanometer two-dimensional structure ceramic split into a beaker with 15mL N,N-dimethylformamide, ultrasonicate for 5 minutes, and then magnetically stir at room temperature for 1 hour to form a uniformly dispersed suspension. turbid liquid;

[0053] (2) Weigh the polyvinylidene fluoride powder according to a certain volume ratio and add it to the above-m...

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Abstract

The invention relates to a high-energy-density sandwich structure flexible composite material and a preparation method therefor. The composite material comprises three substrates, wherein the three substrates are overlapped sequentially, and the two substrates located at outer sides respectively comprise a polymer plate and a two-dimensional material disposed in the polymer plate. The filling volume fraction of the two-dimensional materials is 1%-13%. The central substrate is a hollow polymer plate, and the polymer plates and the hollow polymer plate are made of polyvinylidene fluoride and copolymer of polyvinylidene fluoride. The composite material is prepared through the layer-to-layer tape-casting technology. Compared with the prior art, the composite material effectively regulates and controls an electric field through the difference of dielectric properties between different layers, thereby improving the dielectric constant and breakdown field intensity of the composite material, and finally improving the energy storage density. Moreover, the composite material is simple in technological flow, and the required raw material is simple and easy to process. The composite material is short in preparation period, is high in repeatability, and can be produced in batch.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a flexible composite material with a high energy density sandwich structure and a preparation method thereof. Background technique [0002] With the depletion of traditional energy sources and the increasingly prominent problems of environmental pollution, energy and environmental issues have become urgent problems to be solved in contemporary society. The development and application of capacitors with high energy storage density, as an important means to improve energy efficiency and reduce environmental pollution, has attracted widespread attention. Compared with electrochemical energy storage devices (such as batteries and supercapacitors), dielectric capacitors have the advantages of high discharge power, high utilization efficiency, fast charge and discharge speed, and an all-solid-state structure with stable performance. Dielectric capacitors play an increasin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/86
Inventor 翟继卫潘仲彬沈波
Owner TONGJI UNIV