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High-temperature energy storage hybrid polyetherimide dielectric film and preparation method and application thereof

A technology of polyetherimide dielectric and polyether amic acid, which is applied in the field of high-temperature energy storage hybrid polyetherimide dielectric film and its preparation, and can solve the problems of limited application and lack of energy storage performance

Active Publication Date: 2021-05-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the dielectric composite film has good dielectric properties, it does not have good energy storage performance, which limits its application

Method used

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  • High-temperature energy storage hybrid polyetherimide dielectric film and preparation method and application thereof
  • High-temperature energy storage hybrid polyetherimide dielectric film and preparation method and application thereof
  • High-temperature energy storage hybrid polyetherimide dielectric film and preparation method and application thereof

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preparation example Construction

[0039] S2. Preparation of anhydrous protic solvent containing a small amount of water: use a pipette to uniformly disperse a small amount of water into 2 mL of anhydrous aprotic solvent to obtain an anhydrous protic solvent containing a small amount of water.

[0040] S3. Preparation of hybrid polyetheramic acid slurry: Add the anhydrous protic solvent containing a small amount of water obtained in step S2 into the polyetheramic acid solution obtained in step S1, and stir for 10 minutes to make it uniformly dispersed. Use a pipette to take the metal alkoxide (if the alkoxide is solid, measure it) and disperse it evenly in the anhydrous aprotic solvent while stirring. Subsequently, the metal alkoxide solution was added to the polyetheramic acid solution, and stirred at room temperature for 1 hour to obtain a hybrid polyetheramic acid slurry.

[0041] S3. Preparation of hybrid polyetherimide film: drop hybrid polyetheramic acid slurry on a clean glass plate, coat it to a certain...

Embodiment 1

[0048] Composition and ratio of raw materials:

[0049]

[0050]

[0051] Preparation:

[0052] Preparation of hydroxyl-functionalized polyetheramic acid solution: 87.4 mg of m-phenylenediamine and 1.0 mg of p-aminobenzyl alcohol were weighed and dissolved in 7 mL of anhydrous N-methylpyrrolidone. After the diamine was completely dissolved by stirring, 426.9 mg of bisphenol A diether dianhydride (BPADA) was added three times while stirring, and the dianhydride was added every 5 minutes to ensure that the previously added dianhydride was completely dissolved. When the dianhydride was added for the last time, the viscosity of the solution increased significantly, and the reaction ended. The solution was kept stirring at 25° C. for 1 hour to obtain a polyether amic acid solution with a solid content of 6.7%.

[0053] Preparation of hybrid alumina / polyetheramic acid slurry: Use a pipette to take 10.5 μL of water and evenly disperse it into 2 mL of anhydrous N-methylpyrroli...

Embodiment 2

[0059] Composition and ratio of raw materials:

[0060]

[0061] Preparation:

[0062] Preparation of hydroxyl-functionalized polyetheramic acid solution: 87.4 mg of m-phenylenediamine and 1.0 mg of p-aminobenzyl alcohol were weighed and dissolved in 7 mL of anhydrous N-methylpyrrolidone. After the diamine was completely dissolved by stirring, 426.9 mg of bisphenol A diether dianhydride (BPADA) was added three times while stirring, and the dianhydride was added every 5 minutes to ensure that the previously added dianhydride was completely dissolved. When the dianhydride was added for the last time, the viscosity of the solution increased significantly, and the reaction ended. The solution was kept stirring at 25° C. for 1 hour to obtain a polyether amic acid solution with a solid content of 6.7%.

[0063] Preparation of hybrid tantalum oxide / polyetheramic acid slurry: Use a pipette to take 15.8 μL of water and evenly disperse it into 2 mL of anhydrous N-methylpyrrolidone....

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Abstract

The invention provides a high-temperature energy storage hybrid polyetherimide dielectric film and a preparation method and application thereof, and belongs to the technical field of polymer capacitor films, and the preparation method comprises the following steps: reacting a polyetherimide monomer with a hydroxyl functional group to synthesize a polyetherimide acid solution with a hydroxyl end group or a side chain; then adding water and metal alkoxide as inorganic component precursors into the polyetherimide acid solution to form uniform sol, and preparing the thin film through film coating and thermal imidization treatment. The dielectric film is prepared by a one-step synthesis method, and an inorganic phase is introduced in a hybridization process, so that molecular-level dispersion is realized, agglomeration of the inorganic phase and interfacial compatibility with an organic phase are improved, and the energy storage performance of the dielectric film at high temperature is improved. The energy storage density of the obtained hybrid dielectric material can reach 3.0-3.64 J / cm < 3 > at the temperature of 200 DEG C and the efficiency of 90%, and the energy storage density is greatly higher than that of an existing dielectric. The breakdown strength, the leakage current, the glass transition temperature and other properties are all improved, and the comprehensive dielectric property is good.

Description

technical field [0001] The invention relates to the technical field of polymer capacitor films, in particular to a high-temperature energy storage hybrid polyetherimide dielectric film and its preparation method and application. Background technique [0002] Dielectric capacitors have the highest power density among energy storage devices and are one of the main technologies for realizing advanced electronic and power systems. In particular, capacitors with high operating temperatures are critical to next-generation automotive and aerospace powertrains. In an electric vehicle, a power inverter converts the DC power in the battery to AC at the frequency needed to control the electric motor. Due to the close distance to the engine and the increasing demand for power, it is required that the capacitor, which is the basic component of the power inverter, must work at temperatures above 140°C. Among them, organic film capacitors, which use organic polymers as dielectric materia...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K3/22C08J5/18C08G73/10H01G4/33H01G4/14
CPCC08J5/18C08G73/1071C08G73/1007H01G4/33H01G4/14C08J2379/08C08K2003/2227C08K3/22C08G73/1053C08G73/1017H01G9/028H01G9/025H01G9/06H01G9/0036H01G9/0032C08K5/05C08L79/08C08G73/1032
Inventor 李琦杨明聪何金良成桑
Owner TSINGHUA UNIV
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