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Hydrated alumina dielectric film with solid electrolyte function and its preparation

A hydrated alumina, solid electrolyte technology, applied in the direction of fixed capacitor dielectric, fixed capacitor parts, capacitor manufacturing, etc., can solve the problems of high price, limited energy storage density, small capacitance, etc., to improve the electric strength, The effect of improving energy storage density and reliability

Inactive Publication Date: 2018-06-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is expensive, the capacitance is small, and the application range is limited
And MnO 2 The volume occupied by the electrolyte is relatively large, which limits the improvement of its energy storage density
And using MnO 2 Aluminum solid capacitors as electrolytes have not been practically used so far due to various reasons.

Method used

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  • Hydrated alumina dielectric film with solid electrolyte function and its preparation
  • Hydrated alumina dielectric film with solid electrolyte function and its preparation
  • Hydrated alumina dielectric film with solid electrolyte function and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A 210nm hydrated alumina dielectric film was prepared on the surface of a Pt-coated silicon wafer by spin coating. For the preparation process see figure 1 and image 3 As shown, the details are as follows:

[0059] Grind 0.04mol of aluminum isopropoxide first, then add 100ml of ethylene glycol ether to ultrasonic for 10 minutes, stir at 70°C for 30 minutes, add 0.04mol of acetylacetone, continue stirring for 30 minutes, finally add 20ml of glacial acetic acid, and stir at 100°C for 30 minutes , gradually cooled to room temperature, and finally filtered to obtain 120ml sol precursor.

[0060] Place the Pt-coated silicon wafer sample with a clean and dry surface on a homogenizer, then drop the sol precursor on the surface of the substrate, apply the sol evenly on the surface of the substrate at a speed of 3000 rpm, and then place the sample on the Dry heat treatment in the rapid heat treatment furnace. The pre-drying process conditions are 150°C for 2 minutes, 350°C f...

Embodiment 2

[0063] The alumina hydrate film with a thickness of 210 nm prepared in Example 1 was used. On the surface of the hydrated alumina film, vacuum evaporation equipment was used to prepare an aluminum film with a diameter of 1 mm and a thickness of 150 nanometers. The ability of the hydrated alumina film to be used as a solid electrolyte was studied. The polarization curve of the anodic oxidation process of the aluminum electrode is shown in the appendix Figure 7 shown. After the aluminum electrode is anodized, its cross-sectional view is shown in the attached Figure 8 As shown, an anodic oxide film (AAO) of about 50 nm is formed at the interface between the amorphous aluminum oxide film (AmAO) and the aluminum film (Al). It can be seen that the hydrated alumina dielectric film prepared by this method has a good solid electrolyte function, and can be used as the required negative ion (OH - or O 2- ) source.

Embodiment 3

[0065] A hydrated aluminum oxide film is prepared on the surface of an aluminum sheet that has been anodized in a liquid electrolyte to form porous aluminum oxide by a pulling method. Preparation process see figure 1 and figure 2 As shown, the details are as follows:

[0066] Grind 0.04mol of aluminum isopropoxide first, then add 100ml of ethylene glycol ether to ultrasonic for 10 minutes, stir at 70°C for 30 minutes, add 0.04mol of acetylacetone, continue stirring for 30 minutes, finally add 20ml of glacial acetic acid, and stir at 100°C for 30 minutes , gradually cooled to room temperature, and finally filtered to obtain 120ml sol precursor.

[0067] The sample with a clean and dry surface is immersed in the sol precursor for 20 seconds, then the sample is pulled out of the sol, and the sample is placed in a rapid heat treatment furnace for drying heat treatment. The pre-drying process conditions are 150°C for 2 minutes, 350°C Treatment for 1 minute, 450°C for 1 minute, ...

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Abstract

The invention relates to a hydrated alumina dielectric thin film with a solid electrolyte function and the preparation of the hydrated alumina dielectric thin film. The hydrated alumina dielectric thin film is prepared from alumina and combined water, wherein the alumina has a dielectric function; the combined water is combined with the alumina and enables the alumina to have the solid electrolyte function. The hydrated alumina dielectric thin film is prepared from the following steps of (1) adding acetylacetone in an aluminum alkoxide solution, adding glacial acetic acid in a mixture after stirring and mixing the mixture, continuously stirring and mixing the mixture, and obtaining a sol precursor after carrying out cooling filtration; (2) attaching the sol precursor to a basal body, obtaining an amorphous alumina thin film through gel solidification after carrying out drying treatment, and obtaining a target product by carrying out hydration thermal treatment on the amorphous alumina thin film. Compared with the prior art, the hydrated alumina dielectric thin film disclosed by the invention has an excellent dielectric function and the solid electrolyte function, and a self-repairing function can be provided for a capacitor; meanwhile, the hydrated alumina dielectric thin film has the advantages that the occupied space is small, the energy storage density of the capacitor can be greatly increased, and the like.

Description

technical field [0001] The invention relates to a dielectric thin film and its preparation, in particular to a hydrated alumina dielectric thin film with solid electrolyte function and its preparation. Background technique [0002] During the manufacture and use of capacitors, various defects will inevitably appear in the dielectric film. One of the key technologies to realize the work of the dielectric film under a strong field is the defect self-healing or self-repairing of the dielectric. Traditional capacitors with self-healing functions include metallized film capacitors, aluminum electrolytic capacitors, and tantalum electrolytic capacitors. [0003] Common aluminum electrolytic capacitors use a liquid electrolyte (usually composed of capacitor paper leached electrolyte) as the cathode. Under the action of an applied voltage, these liquid electrolytes can release oxygen, re-form the oxide film at the damaged oxide film, and restore the capacitor to its original state. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G4/10H01G13/00
CPCH01G4/10H01G13/00
Inventor 姚曼文陈建文苏振朱博文邹培彭勇李菲徐开恩姚熹
Owner TONGJI UNIV
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