High energy storage density and efficiency polymer composite film and preparation method thereof

A technology of high energy storage density and composite thin film, which is applied in the field of composite material preparation, can solve problems such as interface polarization, poor flexibility of composite materials, and increased defects, so as to increase the dielectric constant, improve energy storage performance, and increase energy storage density Effect

Inactive Publication Date: 2015-09-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the barium titanate-based / polyvinylidene fluoride composite material, due to the huge difference in the dielectric constant between the dielectric ceramic powder filler and the polymer matrix, an uneven electric field appears inside the composite material, thereby reducing the breakdown field of the composite material. Strong; at the same time, it may lead to interface polarization at the ceramic-composite interface, and the charge accumulation caused by interface polarization (slow polarization or low frequency polarization) is not conducive to the application of high energy storage density materials, and will also reduce the reliability of the device and cycle operation characteristics
At the same time, a large number of research results at home and abroad have shown that the increase in the volume fraction of ceramic powder fillers in the polymer matrix (>60vol.%) is not obvious (<~100) at room temperature. The volume percentage is too high, resulting in poor flexibility of the composite material, and the high content of ceramic particles increases the number of defects in the composite material, which significantly reduces the breakdown field strength of the material

Method used

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  • High energy storage density and efficiency polymer composite film and preparation method thereof
  • High energy storage density and efficiency polymer composite film and preparation method thereof
  • High energy storage density and efficiency polymer composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of BaTiO by Electrospinning 3 nanofibers, 1.5g BaTiO 3 The nanofibers are placed in a mixed solution of alcohol and ammonia water (the ratio of ammonia water and alcohol is 1:50-1:10), stirred in a water bath at 20-50°C for 1-3 hours, and then mixed with different proportions of ethyl alcohol tetraethyl silicate Ester (TEOS) solution (the ratio of TEOS and alcohol is 1:15-1:4)) is added dropwise from the burette into the beaker, the dropping rate is controlled at 0.025-0.25ml / min and the stirring speed is 50-700r / min, after centrifugation , washed with ethanol, dried, and sintered at 500-700°C for 1-3h to obtain BaTiO with a core-shell structure 3 SiO 2 fiber, the core layer is barium strontium titanate ceramic fiber, and the shell layer is a silica coating layer; the nanofibers with core-shell structure are surface-modified with a coupling agent (3-aminopropyltriethoxysilane), Then the modified BaTiO 3 SiO 2 The fibers were added to the PVDF / DMF mixtur...

Embodiment 2

[0029] The method is the same as above, except that the BaTiO 3 SiO 2 The volume ratio of PVDF and PVDF is 5:95, and PVDF polymer-based composite membrane can be made.

[0030] The energy storage density of the composite film is as image 3 The energy storage density shown is 6.2J / cm 3 .

Embodiment 3

[0032] The method is the same as above, except that the BaTiO 3 SiO 2 The volume ratio of PVDF and PVDF is 7.5:92.5, which can make PVDF polymer matrix composite membrane.

[0033] The energy storage density of the composite film is as image 3 The energy storage density shown is 5.8J / cm 3 .

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Abstract

The invention relates to a high energy storage density and efficiency polymer composite film and a preparation method thereof. The composite film is composed of a polyvinylidene fluoride matrix and nanofiber with a core-shell structure in the polyvinylidene fluoride matrix, a core layer of the nanofiber with the core-shell structure is ceramic fiber, and the case layer is a silica coating layer. Compared with prior art, the dielectric constant of the composite film can be adjusted by adjusting the content of ceramic fiber, simultaneously, dielectric loss tangent is less than 5%, breakdown field intensity is greater than 2000kV / cm, and energy storage density is 3-7J / cm<3>. The composite film can reduce interfacial polarization generated at a ceramic-compound interface, can increase the energy storage density of PVDF, can be used for capacitor and large power static energy storage materials, has the advantages of simple and practicable operation, low cost, convenience and rapidity, and enables large scale production.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a polymer composite film with high energy storage density and high efficiency and a preparation method thereof. Background technique [0002] Capacitors with high energy storage density play an important role in power systems, electronic devices, and pulse power supplies, and are widely used in modern defense industries such as hybrid vehicles, tank electromagnetic guns, and electromagnetic launch platforms. At present, the most researched high-energy storage capacitor materials include high-dielectric ferroelectric ceramic materials, glass ceramics, polymer materials, etc. Common high-dielectric ferroelectric ceramic materials such as: BaTiO 3 ,(Ba,Sr)TiO 3 , Pb(ZrTi)O 3 etc. Although it has a high dielectric constant, it consumes a lot of energy during processing (high temperature sintering), has low breakdown field strength, and poor machin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/06C08K7/08C08K3/36C04B35/468C04B35/47C04B35/628
CPCC08K9/06C04B41/009C04B41/4584C08J5/18C08J2327/16C08K3/36C08K7/08C08K2201/003C08K2201/004C08K2201/011C08L2203/16C08L2203/20C08L27/16C04B41/5072C04B14/4681
Inventor 翟继卫刘少辉沈波
Owner TONGJI UNIV
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