Compound material with high energy density and preparation method thereof

A technology of high energy storage density and composite materials, applied in the field of high energy storage density composite materials and their preparation, can solve the problems of microscopic inhomogeneity, dielectric mismatch, and large film brittleness, and achieve excellent uniform dispersion and excellent storage capacity. performance, the effect of eliminating pores and cracks

Active Publication Date: 2018-09-04
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] Due to the different physical and chemical properties of polymer and ceramic particles, it will inevitably cause dielectric mismatch, microscopic inhomogeneity, etc.
In particular, the ceramic particles used in traditional composite materials are large. When the filling amount is large, the film will be brittle and not suitable for practical applications.
And in the prior art, the interface and surface effect of ultrafine ceramic powder make it easy to agglomerate in air and liquid medium, which limits its application

Method used

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  • Compound material with high energy density and preparation method thereof
  • Compound material with high energy density and preparation method thereof
  • Compound material with high energy density and preparation method thereof

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preparation example Construction

[0067] The present invention also provides a preparation method of a high energy storage density composite material, comprising the following steps:

[0068] Coating silicon dioxide on the surface of the titanate to obtain titanate particles with a core-shell structure, which is mixed with a high polymer to obtain the composite material with high energy storage density.

[0069] In a preferred embodiment of the present invention, the method for preparing titanate particles with a core-shell structure includes: dispersing titanate in a solvent, adding tetraethyl silicate to react under alkaline conditions, centrifuging the reacted solution and cleaning to obtain titanate particles with a core-shell structure.

[0070] In a preferred embodiment of the present invention, in the titanate particles with a core-shell structure, the mass fraction of silicon dioxide in the titanate with a core-shell structure is 1-50%, preferably 2-30%, more preferably 2-10%, most preferably 6%.

[...

Embodiment 1

[0083] The preparation method of the high energy storage density composite material described in this embodiment is as follows:

[0084] (1) Ultrafine 0.37g barium titanate (average particle size 6-8nm) is ultrasonically dispersed in absolute ethanol, tetraethyl silicate is used as silicon source, and ammonia water is used as catalyst to hydrolyze tetraethyl silicate to form diethyl silicate Silicon oxide was coated on the surface of barium titanate. After the reaction, the solution was centrifuged and washed with absolute ethanol to obtain barium titanate particles with a core-shell structure (BT@SO). The amount of silica coating on the surface of BT@SO was 6wt% to form a silicon dioxide layer with a thickness of 0.2nm; ultrasonically disperse the obtained BT@SO in 8mL of N,N-dimethylacetamide, so that BT@SO is uniformly dispersed in the solvent to form a uniform dispersion ;

[0085] (2) Add 1 g of polyvinylidene fluoride and 10 mL of N,N-dimethylacetamide into the containe...

Embodiment 2

[0089] The preparation method of the high energy storage density composite material described in this embodiment is as follows:

[0090](1) ultrasonically disperse 0.18g of ultrafine barium titanate (average particle size 6-8nm) in absolute ethanol, use tetraethyl silicate as silicon source, and ammonia water as catalyst to hydrolyze tetraethyl silicate to form di Silicon oxide was coated on the surface of barium titanate. After the reaction, the solution was centrifuged and washed with absolute ethanol to obtain barium titanate particles with a core-shell structure (BT@SO). The amount of silica coating on the surface of BT@SO was 2wt% to form a silicon dioxide layer with a thickness of 0.07nm; ultrasonically disperse the obtained BT@SO in 4mL of N,N-dimethylacetamide, so that BT@SO is uniformly dispersed in the solvent to form a uniform dispersion ;

[0091] (2) Add 1 g of polyvinylidene fluoride and 10 mL of N,N-dimethylacetamide into the container, and magnetically stir fo...

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Abstract

The invention relates to the technical field of high polymer compound materials, in particular to a compound material with high energy density and a preparation method thereof. The compound material with high energy density is mainly obtained by mixing titanate particles of a core-shell structure with a high polymer; the titanate particles of the core-shell structure is obtained by coating silicondioxide on the surface of the titanate particles. According to the compound material with the high energy density and the preparation method thereof, the silicon dioxide serving as an insulating layer is coated on the surface of ultra-fine barium titanate particles to form the titanate of the core-shell structure, the local electric field concentration and electric charge accumulation can be effectively weakened, the formation of a leakage current passage is prevented, the dielectric loss is reduced, the voltage resistant performance of the material is wholly improved, and the homogeneous dispersion of titanate and high-interface compatibility brought by a silicon dioxide layer can improve the puncture of thin film; the titanate of the core-shell structure compounds with the high polymer,and the compound material with excellent energy storage performance can be obtained under the condition of lower filling quantity.

Description

technical field [0001] The invention relates to the technical field of high polymer composite materials, in particular to a high energy storage density composite material and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, dielectric capacitors with high energy density play an important role in pulsed power systems due to their fast charge and discharge performance, long cycle life, good voltage resistance, and high power density. However, the existing low energy density materials limit their miniaturization and further applications. At present, the main method of preparing high energy density materials is to introduce ceramic particles with high dielectric constant into high breakdown strength polymers to combine the advantages of both to obtain high energy density composite materials. Polymers generally have good breakdown, and also have special properties such as piezoelectricity, dielectricity, and pyro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K9/10C08K3/24C08J5/18
CPCC08J5/18C08J2327/16C08K3/24C08K9/10C08L27/16
Inventor 郝亚楠毕美华毕科
Owner BEIJING UNIV OF POSTS & TELECOMM
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