Niobium oxide electrolytic capacitor cathode and producing method thereof

A technology of electrolytic capacitors and niobium monoxide, which is applied in the manufacture of capacitors, capacitors, circuits, etc., and can solve the problem of the limited application range of aluminum electrolytic capacitors, the inability to meet the requirements of miniaturization, high speed and large capacity of mobile phones and computers, and high prices. problem, to achieve the effect of small leakage current, stable anode performance and stable performance

Inactive Publication Date: 2004-11-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tantalum electrolytic capacitors have excellent performance, but the price is high, while the performance of ordinary aluminum electrolytic capacitors limits t

Method used

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  • Niobium oxide electrolytic capacitor cathode and producing method thereof

Examples

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Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] To manufacture the anode of niobium monoxide electrolytic capacitor, first weigh 200g of niobium monoxide with a particle size of 1.0μm, and press it into a blank at 200mg each, and its compaction density is 3.4g·cm -3 ; Then put into a vacuum furnace, vacuum pressure 3 PO 4 , Forming voltage V f Is 50V, the forming temperature is 90℃, and the forming current density is 60mA·g -1 , The constant voltage time is 2h, and the anode of niobium monoxide electrolytic capacitor is obtained. The test results are listed in Table 1.

Example Embodiment

[0034] Example 2

[0035] To manufacture the anode of doped niobium monoxide to manufacture electrolytic capacitors, first weigh 79wt% of niobium monoxide and 21wt% of niobium and mix into 200g of doped niobium monoxide powder with an average particle size of 1.3μm. 3.4g·cm -3 ; Then put into a vacuum furnace, vacuum pressure 3 PO 4 , Forming voltage V f Is 50V, the forming temperature is 90℃, and the forming current density is 60mA·g -1 , The constant voltage time is 2h, and the anode of niobium monoxide electrolytic capacitor is obtained. The test results are listed in Table 1.

Example Embodiment

[0036] Example 3

[0037] To manufacture the anode for doped niobium monoxide electrolytic capacitors, first weigh 79wt% niobium monoxide and 21wt% tantalum and mix them into 200g doped niobium monoxide powder with an average particle size of 1.8μm. Press 200mg per piece to form a blank, and its compaction density is 3.4 g·cm -3 ; Then put into a vacuum furnace, vacuum pressure 3 PO 4 , Forming voltage V f Is 50V, the forming temperature is 90℃, and the forming current density is 60mA·g -1 , The constant voltage time is 2h, and the anode of niobium monoxide electrolytic capacitor is obtained. The test results are listed in Table 1.

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Abstract

The present invention relates to an electrode of electrolytic capacitor, in particular, it is an positive electrode of the electrolytic capacitor which is prepared by using columbium monoxide or doped columbium monoxide and its making method. It is characterized by that using columbium monoxide or doped columbium monoxide whose average grain size is 0.1 micrometer-20 micrometers as raw materials, and making it undergo the processes of pressing to make blank, vacuum sintering and energizing positive electrode block so as to obtain the invented columbium monoxide electrolytic capacitor positive electrode. Its energizing liquor is 0.01%-0.1% H3PO4, energizing voltage Vf is 10V-80V, energizing temp. is 10-90 deg.C, energizing current density is 10 mA.g(-1)-120 mA.g(-1), and time for constant voltage is greater than or equal to 0.5h. Said obtained positive electrode of electrolytic capacitor is stable in performance, high in specific capacity and small in leakage current.

Description

Technical field: [0001] The invention relates to an electrode of an electrolytic capacitor, especially an anode of an electrolytic capacitor prepared with niobium monoxide or doped with niobium monoxide and a manufacturing method thereof. Background technique: [0002] Tantalum electrolytic capacitors have excellent performance, but the price is high, while the performance of ordinary aluminum electrolytic capacitors limits the scope of application, and cannot meet the requirements of miniaturization, high speed and large capacity of mobile phones, computers and other electrical appliances. Since the dielectric film of niobium electrolytic capacitors (Nb 2 o 5 ) has a dielectric constant of 41, and the dielectric film of a tantalum electrolytic capacitor (Ta 2 o 5 ) has a dielectric constant of 27, so the specific capacitance of niobium electrolytic capacitors is higher than that of tantalum electrolytic capacitors, which is more conducive to the miniaturization and light...

Claims

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Application Information

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IPC IPC(8): H01G9/042
Inventor 钟晖李荐钟海云杨建文戴艳阳岳忠
Owner CENT SOUTH UNIV
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