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Method for manufacturing cathode of total-tantalum electrolytic capacitor

A tantalum electrolytic capacitor and cathode technology, applied in the field of electronic materials, can solve the problems of difficulty in electroplating platinum black, difficulty in increasing the capacity of capacitors, and small cathode area, and achieve the effects of increasing cathode area, increasing capacity, and increasing effective area.

Inactive Publication Date: 2013-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the cathode, the tantalum casing faces a problem that it is not easy to plate platinum black, which makes the cathode area smaller and it is not easy to increase the capacity of the capacitor.

Method used

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  • Method for manufacturing cathode of total-tantalum electrolytic capacitor
  • Method for manufacturing cathode of total-tantalum electrolytic capacitor

Examples

Experimental program
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Effect test

example 1

[0059] (1) Use 400-mesh steel grit to blast the inner surface of the tantalum shell of Φ10×100mm under the pressure of 0.6Mpa for 1min;

[0060] (2) The tantalum case after sandblasting was ultrasonically cleaned with acetone and deionized water for 1 hour, and dried at 100°C for later use;

[0061] (3) Add 2 ml of graphene oxide dispersion at a concentration of 2 mg / ml to the cleaned tantalum case;

[0062] (4) Rotate the tantalum shell containing the graphene oxide dispersion for 30s at a rate of 50 rpm;

[0063] (5) Place the tantalum shell in a vacuum of 1.1×10 -4 pa, the temperature is 200°C for 1 hour, and graphene oxide is reduced to graphene at this time;

[0064] (6) Repeat (4)~(5) process 3 times;

[0065] (7) Use the entire tantalum shell as the electrochemical reaction tank and working electrode, add 7ml of electrolyte, insert platinum wire and silver / silver chloride electrode respectively, and the cycle voltage is -0.2~1V, and the scanning speed is 200mV / s. Th...

example 2

[0070] (1) Use 400 mesh steel grit on the inner surface of the tantalum shell of Φ20×120mm, and blast it for 2 minutes under the pressure of 0.6Mpa;

[0071] (2) The tantalum case after sandblasting was ultrasonically cleaned with acetone and deionized water for 1 hour, and dried at 100°C for later use;

[0072] (3) Add 9 ml of graphene oxide dispersion at a concentration of 2 mg / ml to the cleaned tantalum case;

[0073] (4) Rotate the tantalum shell containing the graphene oxide dispersion for 30s at a rate of 50 rpm;

[0074] (5) Put the tantalum shell in a vacuum of 9.7×10 -5 pa, the temperature is 200°C for 1 hour, and graphene oxide is reduced to graphene at this time;

[0075] (6) Repeat (4)~(5) process 3 times;

[0076] (7) Use the entire tantalum shell as the electrochemical reaction tank and working electrode, add 32ml of electrolyte, insert platinum wire and silver / silver chloride electrode respectively, and the cycle voltage is -0.2~1V, and the scanning speed i...

example 3

[0081] (1) Use 400-mesh steel grit to blast the inner surface of the tantalum shell of Φ10×100mm under the pressure of 0.6Mpa for 1min;

[0082] (2) The tantalum case after sandblasting was ultrasonically cleaned with acetone and deionized water for 1 hour, and dried at 100°C for later use;

[0083] (3) Add 2 ml of graphene oxide dispersion at a concentration of 5 mg / ml to the cleaned tantalum case;

[0084] (4) Rotate the tantalum shell containing the graphene oxide dispersion for 30s at a rate of 50 rpm;

[0085] (5) Put the tantalum shell in a vacuum of 8.7×10 -5 pa, the temperature is 200°C for 1.5 hours, at which time graphene oxide is reduced to graphene;

[0086] (6) Repeat (4)~(5) process 3 times;

[0087] (7) Use the entire tantalum shell as the electrochemical reaction tank and working electrode, add 7ml of electrolyte, insert platinum wire and silver / silver chloride electrode respectively, and the cycle voltage is -0.2~1V, and the scanning speed is 200mV / s. The...

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Abstract

The embodiment of the invention discloses a method for manufacturing a cathode of a total-tantalum electrolytic capacitor. The method comprises the following steps of: blasting sand to polish the inner surface of a tantalum housing of the total-tantalum electrolytic capacitor; adding graphene oxide into a dispersing solvent for dispersing to obtain graphene oxide dispersion liquid; adding the graphene oxide dispersion liquid into the tantalum housing, so that the graphene oxide in the graphene oxide dispersion liquid is dispersed on the inner surface; carrying out reduction treatment onto the graphene oxide which is dispersed on the inner surface; and forming a ruthenium oxide layer on the inner surface by an electrochemical method. According to the method disclosed by the embodiment of the invention, the graphene oxide and the ruthenium oxide are compound, so that not only can the area of the cathode of the total-tantalum capacitor be greatly increased, but also the effective area of the tantalum capacitor can be increased; and a pseudocapacitor is introduced onto the tantalum housing, so that the capacity of the capacitor is improved.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to a method for manufacturing a cathode of an all-tantalum electrolytic capacitor. Background technique [0002] Liquid tantalum electrolytic capacitors have the advantages of large capacity, medium and high voltage resistance, and low leakage current, and are especially suitable for use in large-capacity circuits under medium and high voltage conditions. However, liquid tantalum electrolytic capacitors use an acidic liquid electrolyte, and if the liquid leaks, it may short the circuit board and cause serious failure of the device. [0003] All tantalum fully sealed liquid tantalum electrolytic capacitors came into being. It has excellent sealing performance and no liquid leakage, and because of the tantalum shell, it has high environmental stability and can withstand large ripple currents. , suitable for equipment requiring high reliability. The structure of all-tant...

Claims

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Application Information

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IPC IPC(8): H01G9/042H01G9/048
CPCY02E60/13
Inventor 徐建华杨文耀卢斐陈燕杨亚杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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