CN109461577B - Preparation method and application of dielectric energy storage composite material - Google Patents
Preparation method and application of dielectric energy storage composite material Download PDFInfo
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- 238000000034 method Methods 0.000 claims abstract description 40
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- 229910052454 barium strontium titanate Inorganic materials 0.000 claims description 15
- 239000002033 PVDF binder Substances 0.000 claims description 14
- 229910002113 barium titanate Inorganic materials 0.000 claims description 14
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 claims description 14
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- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/20—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06
- H01G4/206—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 inorganic and synthetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/60—Composite insulating bodies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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- Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a preparation method and application of a dielectric energy storage composite material. The preparation method comprises the following steps: coating a solution containing an inorganic dielectric material and a polymer on a substrate, allowing the inorganic dielectric material to settle under a vibration condition, and then heating, curing and molding; and peeling the film obtained by curing from the substrate, then jointing the two films by taking the surface in contact with the substrate as a jointing surface, and then carrying out hot press molding to obtain the dielectric energy storage composite material with the sandwich structure. The method does not need to prevent the sedimentation process of the dielectric material in the solution as the traditional preparation method, but can utilize the natural sedimentation of the dielectric material to generate the transition layer with gradient change of the dielectric material, thereby simplifying the preparation process steps, reducing the macroscopic physical interface, avoiding the problems of too low breakdown voltage and the like caused by too large difference of materials among layers, and effectively improving the performance of the dielectric energy storage composite material.
Description
Technical Field
The invention relates to the field of materials, in particular to a preparation method and application of a dielectric energy storage composite material.
Background
In recent years, with the explosive development of the semiconductor industry, electronic products are also gradually developing towards miniaturization and intellectualization. The performance of the capacitor, which is one of the most important components in electronic products, determines the quality and efficacy of the electronic products to some extent, and the electrical performance of the dielectric material, which is the core material of the capacitor, has an important influence on the performance of the capacitor and thus the electronic products.
Currently, commonly used dielectric materials include conventional inorganic dielectric materials and polymer resin materials, both of which have been widely used. However, the inorganic dielectric material has limited applications due to its low breakdown strength; although the polymer resin material is easier to process and has good compatibility with an organic circuit board, the dielectric constant of the polymer resin material is lower, and the application range of the polymer resin material is also limited.
In order to satisfy the characteristics of high dielectric constant, breakdown resistance, easy processing, and the like at the same time, a dielectric composite material obtained by compounding a polymer with an inorganic dielectric material has been produced. The laminated/multilayered dielectric composite material can further show excellent characteristics such as high dielectric constant, low dielectric loss, high breakdown field strength and high energy storage density.
In the existing method, the multilayer high dielectric film is mostly prepared by adopting a tape casting or hot pressing method, namely, a laminated/multilayer dielectric composite material is formed by pouring a layer of material, although the prepared dielectric composite material has good performance, the preparation process is complex, the sedimentation and agglomeration of the high dielectric filler are avoided as much as possible in the preparation process, and the operation is complex.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a preparation method of a dielectric energy storage composite material, and the method has the advantages of simple and convenient process, small material interlayer difference, high breakdown field strength and the like.
A second object of the present invention is to provide a dielectric energy storage composite.
The third purpose of the invention is to provide the application of the dielectric energy storage composite material.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a dielectric energy storage composite, the dielectric energy storage composite being a three layer structure comprising: an upper polymer layer, a lower polymer layer and an inorganic dielectric material-polymer composite layer intermediate layer; the dielectric energy storage composite material is formed by hot-pressing two double-layer materials, wherein each double-layer material comprises a polymer layer and an inorganic dielectric material-polymer composite layer.
Preferably, in the dielectric energy storage composite material of the present invention, the inorganic dielectric material is a nano inorganic dielectric material; more preferably, the nano inorganic dielectric material includes: at least one of nanowires, nanoplatelets, and nanoparticles; more preferably, the inorganic nano-dielectric material includes: at least one of barium titanate, strontium titanate, barium strontium titanate, and titanium dioxide nanomaterials.
Preferably, in the dielectric energy storage composite material of the present invention, the upper polymer layer includes: at least one of polyvinylidene fluoride, epoxy resin, polyvinylidene fluoride copolymer, polypropylene, polyester, polyurea, and polyimide layer; and/or, the lower polymer layer comprises: at least one of polyvinylidene fluoride, epoxy resin, polyvinylidene fluoride copolymer, polypropylene, polyester, polyurea, and polyimide layer; more preferably, the upper polymer layer is the same material as the lower polymer layer.
Meanwhile, the invention also provides a preparation method of the dielectric energy storage composite material, which comprises the following steps: coating a solution containing an inorganic dielectric material and a polymer on a substrate, allowing the inorganic dielectric material to settle under a vibration condition, and then heating, curing and molding; and peeling the film obtained by curing from the substrate, jointing the two films by taking the surface in contact with the substrate as a joint surface, and performing hot press molding to obtain the dielectric energy storage composite material with the sandwich structure.
Preferably, the preparation method of the present invention further comprises the step of performing surface modification on the inorganic dielectric material, and then dispersing the inorganic dielectric material in a solution.
Preferably, in the preparation method of the present invention, the step of performing surface modification on the inorganic dielectric material includes: the surface of the inorganic dielectric material is coated and modified by dopamine.
Preferably, in the preparation method of the present invention, the inorganic dielectric material is a nano inorganic dielectric material; more preferably, the nano inorganic dielectric material includes: at least one of nanowires, nanoplatelets, and nanoparticles; more preferably, the inorganic nano-dielectric material includes: at least one of barium titanate, strontium titanate, barium strontium titanate, and titanium dioxide nanomaterials.
Preferably, in the preparation method of the present invention, the polymer includes: at least one of polyvinylidene fluoride, epoxy resin, polyvinylidene fluoride copolymer, polypropylene, polyester, polyurea, and polyimide.
Meanwhile, the invention also provides application of the dielectric energy storage composite material in preparation of a capacitor or an electrostatic energy storage device.
Further, the present invention also provides a device or apparatus comprising the dielectric energy storage composite of the present invention.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the inorganic dielectric material with higher density can be settled in the solution by adopting a short-time vibration settling mode to obtain the inorganic dielectric material-polymer composite layer distributed on the bottom surface of the film, the dielectric composite film with 1.5 layers is obtained after heating and curing, and finally the 3-layer dielectric composite film with the sandwich structure is prepared by adopting a hot pressing process. Therefore, compared with the traditional process, the method does not need to prevent the sedimentation process of the dielectric material in the solution, but can generate the transition layer with gradient change of the dielectric material through the natural sedimentation of the dielectric material, thereby not only simplifying the steps of the preparation process, but also avoiding the problems of too low breakdown voltage and the like caused by too large difference of materials among layers, and effectively improving the performance of the dielectric energy storage composite material.
Furthermore, because one surface of the '1.5' layer dielectric composite film pasted substrate is a flat and smooth surface, and the surface of the surface contacting with air is provided with a unit cell structure, the method can ensure that the interlayer physical interface of the three layers of dielectric composite films formed by pasting and the two surfaces of the composite films are flat, and is beneficial to further improving the breakdown voltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a process for synthesizing a dielectric energy storage composite material according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The preparation method of the dielectric energy storage composite material is a new preparation route different from the traditional method of pouring layer by layer to form a laminated structure, and compared with the traditional method, the preparation method of the dielectric energy storage composite material not only can simplify the operation of flow steps, but also can improve the electrical property of the dielectric energy storage composite material.
Specifically, the preparation method mainly uses the following raw materials:
(1) a nano inorganic dielectric material;
in the invention, the raw material form of the raw material nano inorganic dielectric material is at least one of nano wires, nano sheets and nano particles;
specifically, in the present invention, the inorganic nano-dielectric material comprises: barium titanate nanowires, barium titanate nanosheets, barium carbonate nanoparticles; and strontium titanate nanowires, strontium titanate nanosheets, strontium titanate nanoparticles; barium strontium titanate nanowires, barium strontium titanate nanoparticles, barium strontium titanate nanoplates; and at least one of a titanium dioxide nanowire, a titanium dioxide nanosheet, and a titanium dioxide nanoparticle;
the starting materials may be commercially available materials or prepared by methods conventional in the art, as described above.
(2) Polymer and method of making same
The method mainly comprises the following steps: at least one of polyvinylidene fluoride, epoxy resin, polyvinylidene fluoride copolymer, polypropylene, polyester, polyurea, and polyimide.
(3) Solvent(s)
In the present invention, NMP (N-methylpyrrolidone) is preferably used as a solvent as a raw material for dispersing the nano inorganic dielectric material and dissolving the polymer, and because of its high boiling point, NMP can slow down the curing time and provide sufficient settling time for the barium titanate nanowires in the composite thin film.
Further, the preparation method of the dielectric energy storage composite material by using the raw materials comprises the following specific steps:
(1) surface modification of nano inorganic dielectric material
In order to improve the dispersibility of the nano inorganic dielectric material in a polymer matrix, the inorganic nano dielectric material is firstly subjected to surface modification coating, and the dispersibility of the nano inorganic dielectric material in the matrix material is improved by modifying the nano inorganic dielectric material with dopamine.
The method can be specifically carried out as follows:
cleaning the nano inorganic dielectric material, dispersing the nano inorganic dielectric material in a dopamine hydrochloride solution, adjusting the pH to about 8.5 by ammonia water, stirring and mixing, mixing with deionized water and an ethanol solution respectively, centrifuging, and then drying in vacuum to obtain the nano inorganic dielectric material with the dopamine-coated surface.
(2) Synthesis of dielectric energy storage composite material
Firstly, the inorganic dielectric material and the polymer after surface modification are weighed according to the required weight proportion, added into a solvent, fully stirred and ultrasonically treated to obtain a solution in which the inorganic dielectric material is uniformly dispersed and the polymer is dissolved.
Then, referring to fig. 1, a specific molding flow including casting, and steps of shaking, peeling, and hot pressing is performed, and the specific flow may refer to fig. 1 (the following steps (i) to (iv) correspond to the 4 flows in fig. 1, respectively).
(i) Cleaning a substrate (preferably a glass substrate), placing the substrate on a vibration platform, and then coating the solution on the substrate (the solution can be poured at one end of the substrate, and then the solution is spread on the substrate by a scraper, and the thickness of a liquid film is ensured to be uniform);
(ii) starting the vibration platform, adjusting the amplitude to a lower level as much as possible, adjusting the vibration frequency to a higher level, and mechanically vibrating to enable the inorganic dielectric material to naturally settle in the polymer matrix;
after shaking for a period of time (preferably 10min), the shaking is stopped, and the substrate is transferred to a vacuum oven for drying, removing residual solvent, and curing to form a film.
The step is the main innovation of the method, and is different from the operation of superposing hot pressing after layer-by-layer tape casting in the traditional method and controlling the sedimentation of the dielectric material in the tape casting process. In the invention, a micro vibration platform is adopted to settle inorganic filler (dopamine surface modified nano inorganic dielectric material) with slightly higher density by imitating the process of using a concrete vibrator to expel air bubbles in the concrete during the construction process of the concrete so as to compact the concrete.
After a short time of shaking and settling, a nano-dielectric material-polymer composite layer distributed on the bottom surface of the film can be obtained (the solvent gradually evaporates in the process). Also, in this layer, the density of the inorganic nano-dielectric material varies in a gradient (higher density closer to the substrate); meanwhile, the upper layer of the formed film is a polymeric dielectric material layer containing almost no inorganic nano-dielectric material.
Further heating and curing in vacuum to form the double-layer structure film of the polymer layer-nano dielectric material/polymer composite layer.
(iii) Peeling the formed film from the substrate, and then, attaching the two films with the double-layer structure, wherein the attaching surface is a smooth side corresponding to the contact between the film and the substrate (because the surface is directly contacted with the substrate, the formed surface is a smooth surface, and the physical interface formed after further attachment is smooth, which is beneficial to the improvement of breakdown voltage), namely, attaching the side deposited with the inorganic nano dielectric material;
wherein, the raw material inorganic nano-dielectric material and the raw material polymer used for preparing the two bilayer structure films can be respectively and independently selected to be the same or different.
(iv) And finally, carrying out hot press molding to obtain the dielectric energy storage composite material with a three-layer sandwich structure of polymer-inorganic nano dielectric material/polymer composite layer-polymer.
In the dielectric energy storage composite material prepared by the method, the upper layer and the lower layer are pure polymer base layers which hardly contain nano dielectric materials and are used as breakdown layers; the middle layer is a nano-dielectric material/polymer composite layer (formed by laminating two composite layers) as a high dielectric layer.
The polymer base layer and the inorganic nano dielectric material/polymer base layer are generated in a natural sedimentation mode, so that a transition layer is generated, and the concentration of the nano wire has gradient gradually, so that the composite film prepared by the method can effectively avoid the problem of too low breakdown voltage caused by too large difference of materials between layers.
Meanwhile, compared with the traditional three-layer independent preparation process, the preparation method provided by the invention reduces the preparation steps, reduces the macroscopic physical interface (optimizing from two original macroscopic interfaces to one layer of macroscopic interface), and reduces the influence of environmental factors in the preparation or transfer process.
By adopting the traditional composite method, the breakdown voltage of the obtained dielectric composite material is 200-300V/um. The method of the invention not only can simplify the experimental steps, but also can improve the breakdown voltage of the dielectric composite material to be more than 350-400V/um. Meanwhile, on the basis of ensuring that the dielectric constant is not changed, the energy storage density and the breakdown electric field are in a square relation, so that the energy storage density of the dielectric composite material can be improved by at least 78% on the basis of the original dielectric composite material.
The dielectric energy storage composite material prepared by the method has good electrical properties, and can be used for preparing devices such as capacitors or electrostatic energy storages and the like, and further used in various devices.
Example 1 preparation of barium titanate nanowire composite three-layer dielectric energy storage composite material
1. Preparation of BaTiO grown by twice hydrothermal method3Nanowires as a filler component of the multilayer high dielectric film. The method specifically comprises the following steps:
(i) adding TiO into the mixture2Adding the nano powder into NaOH solution, stirring for 2h, mixing with a hydrothermal kettle with a polytetrafluoroethylene lining, screwing, and placing in an environment at 200 ℃ for hydrothermal reaction for 72h to obtain white powder Na2Ti3O7And carrying out suction filtration and cleaning by using deionized water, and drying at 90 ℃.
(ii) Mixing the obtained Na2Ti3O7Powder slowly add Ba (OH)2·8H2Stirring the solution O for 2 hours, finally placing the solution O in a hydrothermal kettle with a polytetrafluoroethylene lining for screwing, carrying out hydrothermal reaction at the temperature of 95 ℃ for 24 hours, and cooling to room temperature to obtain the barium titanate nanowire.
2. Dopamine on BaTiO3Surface modification of nanowires
Mixing BaTiO3Cleaning the nanowires, dispersing the nanowires in a dopamine hydrochloride solution, adjusting the pH value to 8.5 with weak ammonia water, stirring the mixture at 60 ℃ for 17 hours, mixing the mixture with deionized water and an ethanol solution, centrifuging the mixture for multiple times, and performing vacuum drying at 80 ℃ for 24 hours to obtain the dopamine-coated BaTiO with the modified surface3A nanowire.
3. Dopamine BaTiO3Preparation of nanowire/PVDF (polyvinylidene fluoride) -based composite film
Weighing the dopamine BaTiO with the required proportion3Dispersing/dissolving the nanowire and the PVDF-based polymer material in an NMP solvent, stirring for 24 hours and performing ultrasonic treatment for 2 hours to obtain uniformly dispersed dopamine BaTiO3nanowire/PVDF-based composite solutions.
Cleaning a glass substrate, placing the glass substrate on a clean micro vibration platform, and then adding dopamine BaTiO3Pouring the nanowire/PVDF-based composite solution at one end of a glass substrate, and lightly scratching the surface of the solution by a scraper with fixed thickness to ensure that the thickness of a liquid film is uniform;
then, the micro vibration platform is opened, the amplitude is adjusted to be as small as possible, the vibration frequency is increased, and the machine is vibrated for 10min to ensure that the BaTiO3Naturally settling the nanowire;
after 10min, the glass substrate was transferred to a 40 ℃ vacuum oven and dried for 24 hours to drive off residual solvent and cure to a film.
Peeling the obtained film from the surface of the glass, and taking two prepared dopamine BaTiO films3The method comprises the following steps of attaching two films to one surface of a glass substrate, oppositely attaching the two films, putting the two films into a mold, and carrying out hot press molding at 200 ℃ to obtain the dopamine modified barium titanate nanowire composite film with a sandwich structure.
Example 2 preparation of strontium titanate nanoparticle composite three-layer dielectric energy storage composite Material
Dispersing strontium titanate nanoparticles (which can be prepared according to a conventional method, and can be specifically referred to in the prior art, namely CN102139916A, CN104003437A and the like) in a dopamine hydrochloride solution, adjusting the pH to 8.5 by weak ammonia water, stirring for 17h at 60 ℃, mixing and centrifuging for multiple times by deionized water and an ethanol solution respectively, and performing vacuum drying for 24h at 80 ℃ to obtain the dopamine-coated strontium titanate nanoparticles with modified surfaces.
Then, weighing the required ratio of the dopamine strontium titanate nano-particles to the epoxy resin-based polymer material, dispersing/dissolving the two materials in an NMP solvent, stirring for 24 hours, and performing ultrasonic treatment for 4 hours to obtain a uniformly dispersed dopamine strontium titanate nano-particle/epoxy resin-based composite solution.
Cleaning a glass substrate, placing the glass substrate on a clean micro vibration platform, pouring the dopamine strontium titanate nanoparticle/epoxy resin-based composite solution at one end of the glass substrate, and lightly scratching the surface of the solution by a scraper with fixed thickness to ensure that the thickness of a liquid film is uniform;
then, opening the micro vibration platform, adjusting the amplitude to be as small as possible, adjusting the vibration frequency to be high, and mechanically vibrating for 15min to enable the strontium titanate nanoparticles to naturally settle;
then, the glass substrate was transferred to a 45 ℃ vacuum oven, dried for 24 hours to drive off the residual solvent and cured to a film.
And peeling the obtained film from the surface of the glass, taking two prepared dopamine strontium titanate nanoparticle/epoxy resin-based composite films, attaching the two films to one surface of a glass substrate, oppositely attaching the films, putting the films into a mould, and performing hot-press molding at 220 ℃ to obtain the dopamine modified strontium titanate nanoparticle composite film with a sandwich structure.
Example 3 preparation of barium strontium titanate nanosheet composite three-layer dielectric energy storage composite material
Dispersing barium strontium titanate nano-sheets (which can be prepared according to a conventional method, and can be specifically referred to CN103523824A and the like in the prior art) in a dopamine hydrochloride solution, adjusting the pH to 8.5 by weak ammonia water, stirring for 17 hours at 60 ℃, mixing and centrifuging for multiple times by using deionized water and an ethanol solution respectively, and performing vacuum drying for 24 hours at 80 ℃ to obtain the dopamine-coated barium strontium titanate nano-sheets with modified surfaces.
Then, weighing the dopamine barium strontium titanate nanosheet and the PI-based polymer material in the required ratio, dispersing/dissolving the two materials in an NMP solvent, stirring for 24 hours, and performing ultrasound treatment for 4 hours to obtain a uniformly dispersed dopamine barium strontium titanate nanosheet/PI-based composite solution.
Cleaning a glass substrate, placing the glass substrate on a clean micro vibration platform, pouring the dopamine barium strontium titanate nanosheet/PI-based composite solution at one end of the glass substrate, and lightly scratching the surface of the solution by a scraper with fixed thickness to ensure that the thickness of a liquid film is uniform;
then, opening the micro vibration platform, adjusting the amplitude to be as small as possible, adjusting the vibration frequency to be high, and mechanically vibrating for 15min to enable the barium strontium titanate nano-sheets to naturally settle;
then, the glass substrate was transferred to a 45 ℃ vacuum oven, dried for 24 hours to drive off the residual solvent and cured to a film.
And peeling the obtained film from the surface of the glass, taking two prepared dopamine barium strontium titanate nanosheets/PI-based composite films, pasting the two films on one surface of a glass substrate, oppositely fitting, putting the glass substrate into a mold, and performing hot press molding at 220 ℃ to obtain the dopamine modified barium strontium titanate nanosheet composite film with the sandwich structure.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (9)
1. A preparation method of a dielectric energy storage composite material is characterized by comprising the following steps: coating a solution containing an inorganic dielectric material and a polymer on a substrate, allowing the inorganic dielectric material to settle under a vibration condition, and then heating, curing and molding;
and peeling the film obtained by curing from the substrate, adhering the two films by taking the surface in contact with the substrate as an adhering surface, and performing hot press molding to obtain the dielectric energy storage composite material with the sandwich structure.
2. The method according to claim 1, further comprising the step of surface-modifying the inorganic dielectric material and then dispersing the surface-modified inorganic dielectric material in a solution.
3. The method of claim 2, wherein the step of surface modifying the inorganic dielectric material comprises: the surface of the inorganic dielectric material is coated and modified by dopamine.
4. The method according to claim 1, wherein the inorganic dielectric material is a nano inorganic dielectric material.
5. The method of claim 4, wherein the nano inorganic dielectric material comprises: at least one of nanowires, nanoplatelets, and nanoparticles.
6. The method of claim 4, wherein the nano inorganic dielectric material comprises: at least one of barium titanate, strontium titanate, barium strontium titanate, and titanium dioxide nanomaterials.
7. The method of claim 1, wherein the polymer comprises: at least one of polyvinylidene fluoride, epoxy resin, polyvinylidene fluoride copolymer, polypropylene, polyester, polyurea, and polyimide.
8. Use of a dielectric energy storage composite prepared by the method of any one of claims 1 to 7 in the preparation of a capacitor or an electrostatic accumulator.
9. A device or apparatus comprising a dielectric energy storage composite prepared by the method of any one of claims 1-7.
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| CN115431624A (en) * | 2021-06-03 | 2022-12-06 | 四川大学 | Method for preparing multilayer dielectric film by hot pressing method |
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