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A high-temperature-resistant ferroelectric polymer-based dielectric energy storage composite film and its preparation method and application

A technology of ferroelectric polymers and composite thin films, applied in the direction of thin film/thick film capacitors, fixed capacitor dielectrics, laminated capacitors, etc., can solve the problems of unmentioned high temperature applications, untested energy storage density and energy storage efficiency, etc. Achieve the effects of promoting self-assembly deposition, enhancing thermal conductivity, and improving thermal stability

Active Publication Date: 2022-04-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Document 5 did not test the energy storage density and energy storage efficiency, and did not mention its high-temperature application

Method used

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  • A high-temperature-resistant ferroelectric polymer-based dielectric energy storage composite film and its preparation method and application
  • A high-temperature-resistant ferroelectric polymer-based dielectric energy storage composite film and its preparation method and application
  • A high-temperature-resistant ferroelectric polymer-based dielectric energy storage composite film and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0059] The high temperature resistant ferroelectric polymer-based dielectric energy storage composite thin film of this embodiment and the preparation method thereof comprise the following steps:

[0060] Step 1, weigh 1.6g of silicon carbide and dissolve it in a mixed solvent of 200ml of n-butanol, 10ml of deionized water, and 0.5g of cetyltrimethylammonium bromide, and ultrasonically disperse for 30min until a uniform suspension liquid A is formed. Then 4.39ml of tetrabutyl titanate was dissolved in 50ml of n-butanol, and magnetically stirred for 30min to form titanium dioxide precursor solution B.

[0061] Step 2, under the condition of magnetic stirring, slowly drop liquid B into liquid A for 12 hours, so as to completely hydrolyze tetrabutyl titanate. Composite powder can be obtained by spontaneous precipitation, washed three times with deionized water, and dried at 90°C.

[0062] Step 3, adding the obtained core-shell particles into a hydrothermal kettle together with a...

Embodiment 2

[0071] This embodiment is basically the same as Embodiment 1, the difference is:

[0072] Step 4, weigh 0.1132g of core-shell powder and disperse it into 10ml of dimethylformamide, and ultrasonically disperse for at least 4 hours until a uniform suspension is formed. Then 1.0193 g of P(VDF-HFP) was added to the suspension using ultrasonic dispersion and mechanical shaking for several hours until a homogeneous suspension. A composite film with a mass fraction of 10 wt.% was prepared by casting method. Dry at 90°C to obtain a nanocomposite film. The composite film is a single layer with a thickness of 10-20 μm.

Embodiment 3

[0074] This embodiment is basically the same as Embodiment 1, the difference is:

[0075] Step 4, weigh 0.0256g of core-shell powder and disperse it into 10ml of dimethylformamide, and ultrasonically disperse for at least 4 hours until a uniform suspension is formed. Then 0.9998 g of P(VDF-HFP) was added to the suspension using ultrasonic dispersion and mechanical shaking for several hours until a homogeneous suspension. A composite membrane with a core-shell nanofiller mass fraction of 2.5wt.% was prepared by casting method. Dry at 90°C to obtain a nanocomposite film. The composite film is a single layer with a thickness of 10-20 μm.

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Abstract

The present invention proposes a high-temperature-resistant ferroelectric polymer-based dielectric energy storage composite film and its preparation method and application. Aiming at the easy seepage effect of SiC whiskers, the present invention prepares SiC@BaTiO by hydrolysis and hydrothermal method 3 The core-shell composite filler fully covers the SiC nanoparticles, which inhibits the formation of seepage channels; the high thermal conductivity of SiC (114W / m.K) enhances the thermal conductivity of the composite film and improves the thermal stability of the composite film; high dielectric Constant BaTiO 3 The interface polarization effect of the shell and core-shell particles enhances the dielectric constant of the composite film; at the same time, the core-shell filler with insulating properties and the surface modification of the core-shell filler promote the compatibility between the filler and the organic-inorganic interface of the substrate, maintaining The lower dielectric loss is achieved; finally, the composite film has higher energy storage density and breakdown strength under the test condition of 120 °C, and the working temperature range of the ferroelectric polymer is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of ceramic and ferroelectric polymer composite materials, in particular to a high-temperature-resistant ferroelectric polymer-based dielectric energy storage composite film and its preparation method and application. Background technique [0002] Electrostatic capacitors are energy storage devices and important components in electronic power systems. They have broad application prospects in emerging fields such as hybrid electric vehicles, new energy technologies, flexible direct transmission, and downhole oil and gas exploration. The key to preparing electrostatic capacitors with high energy storage density is to achieve high polarizability (high dielectric constant) and high breakdown field strength of the dielectric layer. Based on ferroelectric polymer polyvinylidene fluoride (PVDF) series, the composite film material filled with high dielectric ceramic nanofillers combines the advantages ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08K9/10C08K9/04C08K3/22C08K3/34C08J5/18H01G4/20H01G4/33
CPCC08J5/18H01G4/20H01G4/33C08J2327/16C08K9/10C08K9/04C08K3/34C08K2201/011C08K2003/2237
Inventor 周令罗钟灿叶展文段波陈刚翟鹏程
Owner WUHAN UNIV OF TECH
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