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Preparation method of high dielectric and high energy storage nanocomposite material

A nano-composite material and nano-material technology, applied in the field of nano-composite materials, can solve problems such as large thickness and affect sample performance, and achieve the effect of reducing interface polarization

Active Publication Date: 2021-07-13
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because most of the electrospun fibers have a loose and porous structure, and the thickness of the sample formed by hot pressing is relatively large, the composite materials prepared by the above three methods are often accompanied by defects such as pores, which will affect the final performance of the sample.

Method used

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  • Preparation method of high dielectric and high energy storage nanocomposite material
  • Preparation method of high dielectric and high energy storage nanocomposite material
  • Preparation method of high dielectric and high energy storage nanocomposite material

Examples

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Embodiment 1

[0038] This embodiment relates to a kind of (polyvinylidene fluoride-hexafluoropropylene) copolymer (PVDF-HFP) and one-dimensional barium titanate (BaTiO 3 ) nanowire is a preparation method for preparing aba three-layer dielectric film, which specifically includes the following steps:

[0039] Step 1: Prepare precursor solution

[0040] The prepared one-dimensional BaTiO 3 The nanowires were added to acetone (acetone) and N,N-dimethylformamide (DMF) mixed solvent, stirred for 12 hours after ultrasonic oscillation, so that BaTiO 3 The nanowires are uniformly dispersed in the mixed solvent. Then PVDF-HFP particles were added to the above solution, heated in a water bath with magnetic stirring for 2 hours, and the heating temperature was 40°C. Electrospinning precursor solution A was obtained.

[0041] One-dimensional BaTiO 3 The nanowires were added to N, N-dimethylformamide (DMF) solvent, stirred for 12 hours after ultrasonic oscillation, so that the BaTiO 3 The nanowire...

Embodiment 2

[0051] Change the inorganic material in Example 1 into titanium dioxide nanowires, and use polyvinylidene fluoride as the polymer matrix. The dielectric constant obtained under different contents is between 10.5-12.5 (1kHz), and the energy density is 5.2-7.5J / cm 3 Between, the breakdown strength is between 280 ~ 350MV / m.

Embodiment 3

[0053] In Example 1, the inorganic material is changed to strontium titanate nanowires, the polymer matrix is ​​polyvinylidene fluoride, the dielectric constant obtained under different contents is between 12.5~16 (1kHz), and the energy density is between 6.5~10.8J / cm 3 Between, the breakdown strength is between 300 and 360MV / m.

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Abstract

The invention provides a method for preparing a high-dielectric, high-energy-storage nanocomposite material, which comprises the following steps: separately preparing an electrospinning precursor solution, a coating film precursor solution A and a coating film precursor solution B; The electrospinning precursor solution was electrospun to obtain an ordered fiber film; the coating film precursor solution A was cast to form a film to obtain a cast film A, and the ordered fiber film was spread on the The surface of the cast film A, after drying, the film precursor solution B is cast on the surface of the ordered fiber film A to form the cast film B; quenching is carried out at 200 ° C to obtain the high dielectric, high Energy storage nanocomposites. The nanocomposite material prepared by the invention has a compact structure, overcomes the disadvantages of high porosity of the traditional electrospun fiber membrane, and has wide potential applications in electrostatic capacitors, electric pressure control systems, cable insulation, transistors and the like.

Description

technical field [0001] The invention belongs to the field of nano-composite materials, and in particular relates to a method of using electrospinning technology as a carrier to orderly arrange one-dimensional nano-materials in the composite material, thereby regulating the dielectric and energy storage properties of the polymer composite material. method. Background technique [0002] High dielectric (high-k) materials are widely used in the electronic power industry. Taking electrostatic capacitors as an example, by the formula It can be seen that the maximum energy storage density (U max ) is proportional to the dielectric constant (k) of the material and the highest electric field strength it can withstand (E BD ), ε 0 Indicates the vacuum permittivity, that is, a high permittivity means the material can store more energy. [0003] In addition to the dielectric constant, ideal high dielectric materials also need to have high breakdown strength and low dielectric los...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/06B32B27/30B32B33/00
CPCB32B5/02B32B33/00B32B2262/0238B32B2262/10B32B2262/105B32B2262/106B32B2307/204
Inventor 孙彬黄兴溢陈金朱荧科王利伟江平开
Owner SHANGHAI JIAOTONG UNIV