Graphite paper and barium titanate ceramic film capacitor and preparation method thereof

A technology of ceramic thin film and barium titanate, which is applied in the field of graphite paper-barium titanate ceramic thin film capacitors and their preparation, can solve the problems of low capacitance of thin film dielectric constant capacitors, difficulty in meeting the requirements of large-capacity capacitors, expensive metal electrode materials, etc. problem, to achieve the effect of simple production method, easy processing and low price

Active Publication Date: 2013-10-09
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The film dielectric constant and capacitor capacity of the current ceramic film capacitors are low, which is difficult to meet the requirements of the capacitor market for large-capacity capacitors. The price of metal electrode materials is too expensive, which is also one of the defects of the current ceramic film capacitor preparation methods.
However, the preparation of capacitors by tape casting requires separate sintering of the dielectric layer and co-firing of the dielectric layer and electrode materials. The process is complex and the co-firing process requires too high a temperature atmosphere.

Method used

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  • Graphite paper and barium titanate ceramic film capacitor and preparation method thereof
  • Graphite paper and barium titanate ceramic film capacitor and preparation method thereof
  • Graphite paper and barium titanate ceramic film capacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032]A single-layer dielectric layer was selected, and the mass ratio of barium titanate powder, anhydrous ethanol, and zirconia balls was 1:1:1.25, and the ball milled in a star ball mill at a speed of 400 r / min for 10 h, and the pulling speed was 4 cm. / min to form a film, press 36MPa to form, and then under vacuum conditions, pressurize 3.6MPa throughout the process, heat up to 900°C for 15min at a heating rate of 30°C / min, then rise to 1200°C for sintering for 0.5h, and cool naturally After that, the capacitor was obtained by processing in a muffle furnace at 450°C for 6 hours. The thickness of the obtained barium titanate ceramic dielectric layer is 20 μm, and the area of ​​the inner electrode is 2.25 cm 2 The electrochemical properties of the ceramic film capacitors were tested under the EIS test system.

[0033] The test frequency is 100Hz. After testing, the capacitor has a capacitance value of 56.4nF, a dielectric constant of 566 and a dielectric loss of 2.68 under ...

Embodiment 2

[0035] Select a three-layer dielectric layer, use barium titanate powder, anhydrous ethanol, and zirconia balls with a mass ratio of 1:1:1.25, in a star-shaped ball mill at a speed of 400 r / min for 10h, and the pulling speed is 2cm / min to form a film, press 36MPa to form, and then under vacuum conditions, pressurize 3.6MPa throughout the process, heat up to 900°C for 15min at a heating rate of 30°C / min, then rise to 1200°C for sintering for 0.5h, and cool naturally After that, the capacitor was obtained by processing in a muffle furnace at 450°C for 6 hours. The thickness of the barium titanate ceramic dielectric layer is 12 μm, and the internal electrode area is 2.25 cm 2 The electrochemical properties of the ceramic film capacitors were tested under the EIS test system.

[0036] The test frequency is 100Hz. After testing, the capacitance value of the capacitor reaches 196nF under the 1V test voltage, the dielectric constant reaches 525, and the dielectric loss is 2.79; und...

Embodiment 3

[0038] To select a capacitor with a single-layer dielectric layer and an alumina layer, firstly, the alumina powder, anhydrous ethanol, and zirconia balls were ball-milled at a speed of 500 r / min for 8 hours at a mass ratio of 1:1:1. The alumina dispersion liquid was prepared, and the mass ratio of barium titanate powder, anhydrous ethanol, and zirconia balls was 1:1:1.25, and the barium titanate dispersion liquid was prepared by ball milling in a star ball mill at a speed of 400 r / min for 10 hours. The graphite paper electrode was pulled to form a film in an alumina dispersion at a pulling speed of 4 cm / min, dried and then pulled into a film at the same pulling speed in a barium titanate dispersion, pressured at 36 MPa to form a film, and then placed in a barium titanate dispersion to form a film. Under the condition of 3.6 MPa in the whole process, the temperature was raised to 900 °C for 15 min at a heating rate of 30 °C / min, and then raised to 1200 °C for sintering for 0.5 ...

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Abstract

The invention provides a graphite paper and barium titanate ceramic film capacitor. The graphite paper and barium titanate ceramic film capacitor comprises one or more layers of inner electrodes, ceramic dielectric layers among the inner electrodes, insulating layers between the dielectric layers and the inner electrodes, and end electrodes at the two ends. The graphite paper and barium titanate ceramic film capacitor is characterized in that the inner electrodes are made of graphite paper materials, the dielectric layers are barium titanate ceramic film, the end electrodes are formed by coating conductive aquadag in a dried mode, the insulating layers are aluminum oxide ceramic film, and the outermost layer of the graphite paper and barium titanate ceramic film capacitor is wrapped and packaged by barium titanate ceramic. A preparation method for the graphite paper and barium titanate ceramic film capacitor comprises the steps of (1) using graphite paper as the inner electrodes, (2) carrying out film pulling forming in aluminum oxide ethanol dispersion liquid, (3) carrying out film pulling forming and lamination in barium titanate ethanol dispersion liquid after drying, (4) using barium titanate powder to carry out packaging, and (5) carrying out integral pressure forming and vacuum hot pressing sintering to form the graphite paper and barium titanate ceramic film capacitor. The graphite paper and barium titanate ceramic film capacitor prepared through the preparation method has the advantages of being excellent in performance, high in dielectric constant, low in cost, simple in production technology and controllable in structure, and facilitating commercial production.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to a novel energy storage element with stable performance and a preparation method thereof, in particular to a graphite paper-barium titanate ceramic film capacitor and a preparation method thereof. Background technique [0002] Ceramic film capacitors are capacitors that use dielectric ceramics as the dielectric layer, and alternately stack the dielectric layer and the electrode layer to form a layered structure. It is the largest and fastest-growing chip component variety in the world. A ceramic film capacitor is a typical Faraday capacitance structure, that is, a ceramic dielectric film is placed between two electrodes. The structure of traditional ceramic film capacitors is that electrodes and ceramic dielectric layers are alternately stacked and formed. Finally, the electrodes at both ends of each monolithic capacitor are respectively connected through terminal electrodes to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/008H01G4/12H01G4/252H01G4/224H01G4/002H01G4/33
Inventor 王玮朱志斌董会铉初蕾贺本林孙明亮孙峰曲俊李亚群孙帆
Owner OCEAN UNIV OF CHINA
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