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Method for preparing cathode of fully-sealed liquid mixed tantalum capacitor

A liquid mixing, tantalum capacitor technology, applied in the direction of capacitor electrodes, capacitor parts, etc., can solve the problems of air pollution and time-consuming, and achieve the effect of less pollution, less time-consuming, and easy industrial production.

Inactive Publication Date: 2010-06-09
西安华泰有色金属实业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] These patented technologies all use concentrated hydrochloric acid, and hydrogen chloride escapes into the air when heated, polluting the air
Moreover, once coating needs to be kept at 300°C for 1 to 2 hours to decompose chlorides into oxides. In order to make the oxide layer reach the required thickness, it is necessary to repeat the coating-thermal decomposition process many times. This process is very time-consuming.

Method used

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  • Method for preparing cathode of fully-sealed liquid mixed tantalum capacitor

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Embodiment 1

[0030] The specific preparation steps of this embodiment are as follows:

[0031] (1) Pretreatment of tantalum foil

[0032] To pretreat the tantalum foil, polish the flat tantalum foil with fine sandpaper to make its surface rough. Put the tantalum foil into a 5% sodium hydroxide solution, and vibrate it with ultrasonic waves for 10 minutes to remove the tantalum chips and oil stains on the surface of the tantalum foil, wash it with deionized water three times, and dry it at 100°C for later use.

[0033] (2) Preparation of solution

[0034] Adding the ruthenium compound into the solvent, fully dissolving it into a solution with a mass fraction of 1%, then adding the acidic compound, the mass of the added acidic compound is 2% of the mass of the ruthenium compound, stirring the mixed solution evenly to obtain the solution to be prepared. Wherein in the present embodiment, the ruthenium compound is RuCl 3 ·3H 2 O. The solvent is a mixture of ethylene glycol methyl ether, e...

Embodiment 2

[0042] The specific preparation steps of this embodiment are as follows:

[0043] (1) Pretreatment of tantalum foil

[0044] When processing tantalum foil, tantalum foil is immersed in acid mixed solution for corrosion, then washed and dried for later use; the acid mixed solution is composed of 20ml of hydrofluoric acid solution with a mass fraction of 40%, 40ml of concentrated nitric acid and 15ml of concentrated sulfuric acid. It is made; the tantalum foil is immersed in the prepared mixed acid solution and corroded for 30 seconds, then washed with deionized water and dried for later use.

[0045] (2) Preparation of solution

[0046]The ruthenium compound is added to the solvent, fully dissolved into a solution with a mass fraction of 30%, and then the basic compound is added. The mass of the basic compound added is 50% of the mass of the ruthenium compound, and the mixed solution is stirred evenly to obtain the compound to be prepared. solution. Wherein in the present em...

Embodiment 3

[0054] The specific preparation steps of this embodiment are as follows:

[0055] (1) Pretreatment of tantalum foil

[0056] To pretreat the tantalum foil, polish the flat tantalum foil with fine sandpaper to make its surface rough. Put the tantalum foil into a 5% sodium hydroxide solution, and vibrate it with ultrasonic waves for 10 minutes to remove the tantalum chips and oil stains on the surface of the tantalum foil, wash it with deionized water three times, and dry it at 100°C for later use.

[0057] (2) Preparation of solution

[0058] The ruthenium compound is added into the solvent, fully dissolved into a solution with a mass fraction of 20%, and then the acidic compound is added. The mass of the added acidic compound is 30% of the mass of the ruthenium compound, and the mixed solution is stirred evenly to obtain the solution to be prepared. In this embodiment, ruthenium nitrate is selected as the ruthenium compound, ethanol is selected as the solvent, and acetic aci...

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Abstract

The invention discloses a method for preparing a cathode of a fully-sealed liquid mixed tantalum capacitor, which comprises the following steps: pre-treating a tantalum foil to coarsen the surface of the tantalum foil; preparing solution containing a ruthenium compound and coating the solution on the tantalum foil to form a liquid membrane of which the thickness is 100 to 500 microns; preserving the temperature of the coated tantalum foil in a muffle furnace of which the temperature is 200 to 600 DEG C; and finally, boiling the tantalum foil in deionized water for 5 to 15min to remove undecomposed ruthenium compound and other byproducts in a ruthenium dioxide film, and drying the ruthenium dioxide film to obtain the cathode of the fully-sealed liquid mixed tantalum capacitor. The method for preparing the cathode of the fully-sealed liquid mixed tantalum capacitor of the invention adopts an acidic compound or an alkalic compound to substitute for a concentrated Hydrochloric acid, and has the advantages of low pollution in the whole preparation process, simple process and low time consumption. Because the ruthenium dioxide of the capacitor cathode prepared by the preparation method of the invention is firmly bonded on the tantalum foil and forms a coarse surface, the cathode has a high capacity. The preparation method of the invention needs no costly production equipment and is easy to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of capacitor cathodes, and relates to a method for preparing a capacitor cathode, in particular to a method for preparing a fully sealed liquid mixed tantalum capacitor cathode. Background technique [0002] Large-capacity fully sealed liquid hybrid tantalum capacitor is a new type of electrochemical capacitor. It has small size, light weight, low internal resistance, large output current, and high energy density. It has broad application prospects in aerospace, precision instruments and other fields. In the energy conversion circuit, power pulse circuit, and disconnection delay circuit of precision electronic equipment, as well as in the case of transient conversion of main power supply or signal source switching, it is necessary for a high-capacity capacitor to undertake the discharge task, so that a certain The specific operating voltage or operating current maintains a delay of more than 50 milliseconds....

Claims

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Application Information

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IPC IPC(8): H01G9/04
Inventor 唐平生冯庆冯生龙海云刘博
Owner 西安华泰有色金属实业有限责任公司
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