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High-specific-volume low-voltage aluminum electrolytic capacitor and manufacturing method thereof

A technology for aluminum electrolytic capacitors and capacitors, which is applied in the direction of electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve the problems of difficulty in ensuring the close adhesion between conductive materials and aluminum foil substrates, high preparation costs, and expensive equipment, and expand the scope of use , The preparation method is simple, the effect of saving space

Inactive Publication Date: 2014-03-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of method is complicated in process, expensive equipment is required, and the preparation cost is high, and it is difficult to ensure the tight adhesion of the conductive material to the aluminum foil substrate.

Method used

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  • High-specific-volume low-voltage aluminum electrolytic capacitor and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] Titanium oxide nanotube array membrane electrode was prepared by constant voltage anodization method: titanium foil (10 μm thick) was used as the working electrode, and carbon rod was used as the counter electrode for anodic oxidation in a two-electrode system, and the electrolyte was 0.5wt% NH 4 F and 2vol%H 2 O solution in ethylene glycol. First, the natural oxide film on the surface was removed by chemical polishing for 60 s, and then the polished titanium foil was ultrasonically cleaned in deionized water. The composition of polishing liquid is HF:HNO 3 :H 2 O=1:1:2(v). In order to prepare highly ordered titanium oxide nanotube arrays, a secondary anodic oxidation method was used. The primary oxidation was oxidized at 20°C and constant pressure 60V for 5 minutes, then the primary oxide film was removed by ultrasonication for 15 minutes, and then cleaned with deionized water; and then secondary oxidation was performed for 5 minutes under the same conditions. Fin...

Embodiment 2

[0021] The primary oxidation time for titanium oxide cathode preparation is 10 minutes, and other processes are the same as in Example 1. This titanium oxide cathode has a specific volume of 151μF / cm 2 , a combination of energized anode aluminum foils with a thickness of 110 μm to prepare a wound electrolytic capacitor core with a working voltage of 10V, and then put it into a Φ10×10.5 aluminum shell and seal it. The working electrolyte used in the capacitor is the same as in Example 1. The finished capacitor was obtained after aging at 90° C. for 2 h with an aging voltage of 11.5 V.

Embodiment 3

[0025] The primary oxidation time of the titanium oxide cathode is 5 minutes, the secondary oxidation time is 10 minutes, and other processes are the same as in Example 1. This titanium oxide cathode has a specific volume of 96.5μF / cm 2 , a combination of energized anode aluminum foil with a thickness of 110 μm to prepare a wound electrolytic capacitor core with a working voltage of 16V, and then put it into a Φ10×10.5 aluminum shell for sealing. The working electrolyte used in the capacitor is the same as in Example 1, and the finished capacitor is obtained after aging for 2 hours at 90°C with an aging voltage of 21V.

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Abstract

The invention discloses a high-specific-volume low-voltage aluminum electrolytic capacitor and a manufacturing method thereof. A titanium oxide nanotube array film is used as a cathode which replaces a corrosion aluminum foil cathode of a traditional aluminum electrolytic capacitor, and the capacitor is manufactured with the adoption of the production technology, a working electrolyte and the burn-in technology similar to those of the traditional aluminum electrolytic capacitor. Due to the fact that the titanium oxide cathode is high in strength, small in thickness and high in specific volume, under the circumstance that the volumes are the same, the area of an anode aluminum foil can be increased, and the specific volume of the capacitor is improved. According to the manufacturing method, the specific volume of the low-voltage aluminum electrolytic capacitor can be improved by more than 50%; in addition, the titanium oxide cathode is directly formed on a titanium foil substrate through anodic oxidation, the binding force between the titanium oxide cathode and the titanium foil substrate is high, and no titanium oxide film falls off from the substrate.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices and relates to the preparation of aluminum electrolytic capacitors, in particular to a high specific volume low voltage aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors are widely used in various electronic devices due to their low price and high specific capacity. They are one of the fastest growing and most important electronic components in the past two decades. This kind of capacitor is generally made of 4 layers of anode aluminum foil, electrolytic paper, cathode aluminum foil, and electrolytic paper. When the wound capacitor core is impregnated with electrolyte, it is sealed with an aluminum shell and a rubber plug to form an electrolytic capacitor. The electrolytic paper in the core plays the role of absorbing the working electrolyte and isolating the gasket. The structure of the aluminum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/145
Inventor 宋晔吕惠玲曹刘朱绪飞
Owner NANJING UNIV OF SCI & TECH
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