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An alumina nanoparticle/polyimide based energy-storage medium and a preparing method thereof

A nano-alumina, polyimide-based technology, applied in the field of dielectric composite materials, can solve the problems of low energy storage density of polyimide, and achieve the effects of excellent mechanical properties, high relative permittivity, and simple equipment

Inactive Publication Date: 2019-05-21
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low polyimide energy storage density, the invention provides an alumina nanoparticle / polyimide-based energy storage medium and its preparation method

Method used

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  • An alumina nanoparticle/polyimide based energy-storage medium and a preparing method thereof

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Effect test

Embodiment 1

[0030] A method for preparing an alumina nanoparticle / polyimide-based energy storage medium, the steps are as follows:

[0031] Step 1, preparing alumina nanoparticles:

[0032] Mixing aluminum nitrate, deionized water and absolute ethanol according to a certain mass-volume ratio, drying at a certain temperature, and performing ball milling, calcination and nano-sanding treatment on the obtained powder in sequence to obtain alumina nanoparticles;

[0033] Step 2. Prepare precursor solution:

[0034] Prepare the alumina nanoparticles, N,N-dimethylformamide, pyromellitic anhydride and 4,4-diaminodiphenyl ether prepared in step 1 according to a certain mass volume ratio, and prepare the alumina nanoparticles, homogeneous Mix pyromellitic anhydride and N,N-dimethylformamide and ultrasonically disperse for a certain period of time, add 4,4-diaminodiphenyl ether in batches during the stirring process under ice-water bath conditions, and obtain a mixed colloidal precursor after full...

Embodiment 2

[0038] A method for preparing an alumina nanoparticle / polyimide-based energy storage medium, the steps are as follows:

[0039] Step 1, preparing alumina nanoparticles:

[0040] Mix aluminum nitrate, deionized water and absolute ethanol according to the mass volume ratio of 1g:1ml:10ml and stir evenly, then pour it into a petri dish, place it in an oven and dry it at 80°C for 8-12h; into a ball mill tank, add absolute ethanol with a volume of 60% of the ball mill tank volume, ball mill at a speed of 600-800r / min for 12 hours, and dry the obtained slurry in a vacuum oven at 80°C for 8 hours; put the dried powder into a In the Furnace, at a heating rate of 2°C / min, rise to 900°C in 450 minutes, keep warm at 900°C for 1 hour and then cool down to room temperature; add the calcined powder into the container of the nano sand mill, and add 60% of the volume of the sand mill Anhydrous ethanol, after sanding at a speed of 2500r / min for 4h, drying in a vacuum oven at 80°C for 8h to ob...

Embodiment 3

[0046] A method for preparing an alumina nanoparticle / polyimide-based energy storage medium, the steps are as follows:

[0047] Step 1, preparing alumina nanoparticles:

[0048] Mix aluminum nitrate, deionized water and absolute ethanol according to the mass volume ratio of 1g:1ml:10ml and stir evenly, then pour it into a petri dish, place it in an oven and dry it at 80°C for 8-12h; into a ball mill tank, add absolute ethanol with a volume of 60% of the ball mill tank volume, ball mill at a speed of 600-800r / min for 12 hours, and dry the obtained slurry in a vacuum oven at 80°C for 8 hours; put the dried powder into a In the Furnace, at a heating rate of 2°C / min, rise to 900°C in 450 minutes, keep warm at 900°C for 1 hour and then cool down to room temperature; add the calcined powder into the container of the nano sand mill, and add 60% of the volume of the sand mill Anhydrous ethanol, after sanding at a speed of 2500r / min for 4h, drying in a vacuum oven at 80°C for 8h to ob...

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Abstract

The invention relates to an alumina nanoparticle / polyimide based energy-storage medium and a preparing method thereof, and belongs to the technical field of dielectric composite materials. To solve aproblem that polyimide has low energy storage density, prepared alumina nanoparticles are fully mixed with N,N-dimethylformamide and pyromellitic dianhydride according to a certain mass / volume ratio;then the mixture is added into 4,4-diaminodiphenyl ether in several times to obtain a precursor solution; after a film is prepared from the precursor solution, gradient-temperature raising imidation is performed, and a cooling step is performed to obtain the medium. The alumina nanoparticles are added into a polyimide matrix with a low loading level to ensure that the medium has excellent mechanical properties, and the medium obtained by modification of the polyimide matrix with the alumina nanoparticles has a relatively high relative dielectric constant, breakdown field strength and energy storage density and has low dielectric loss, thus solving a technical problem that dielectric capacitors have low energy storage density.

Description

technical field [0001] The invention belongs to the technical field of dielectric composite materials, and in particular relates to an alumina nanoparticle / polyimide-based energy storage medium and a preparation method thereof. Background technique [0002] With the continuous increase of energy demand and the continuous consumption of traditional energy, the problems of improving the utilization efficiency of traditional energy and expanding the scope of energy use have become increasingly prominent. The dielectric capacitor has many advantages such as high power density, fast charging and discharging, long cycle, simple structure, and no pollution, making it an ideal device to solve energy storage problems, but its low energy storage density limits its wider promotion. and apply. Polyimide is a high polymer with a stable chemical structure and has good electrical insulation and dielectric properties. It is often used as a dielectric energy storage material, but due to its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L79/08C08G73/10C08K3/22
Inventor 迟庆国王博张天栋张昌海王暄
Owner HARBIN UNIV OF SCI & TECH
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