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Electrolyte used for treating aluminium foil in aluminium electrolytic capacitor

A technology for aluminum electrolytic capacitors and electrolytes, applied in the field of electrolytes, can solve problems such as large surface tension, affecting the leakage current and reliability of aluminum electrolytic capacitors, and affecting the properties of oxide film media, so as to improve leakage current and reliability, and be suitable for Effect of large-scale technical improvement and reduction of surface tension

Inactive Publication Date: 2010-10-27
FUJIAN GUOGUANG ELECTRONICS SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment effect of aluminum foil directly affects the properties of the oxide film medium, and ultimately affects the leakage current and reliability of aluminum electrolytic capacitors.
[0005] However, the electrolyte solution currently used to treat aluminum foil in aluminum electrolytic capacitors has a large surface tension, and the wettability of the solution on the surface of the aluminum foil during the treatment process is low, which cannot effectively reach the defects of the oxide film medium, nor can it effectively reach the corrosion hole walls and the surface of the aluminum foil. The bottom of the hole, the leakage current and reliability of the final aluminum electrolytic capacitor cannot achieve the desired effect

Method used

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  • Electrolyte used for treating aluminium foil in aluminium electrolytic capacitor
  • Electrolyte used for treating aluminium foil in aluminium electrolytic capacitor
  • Electrolyte used for treating aluminium foil in aluminium electrolytic capacitor

Examples

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Effect test

Embodiment 1

[0022] Please combine figure 1 and figure 2 As shown, the 13VF aluminum foil 6 including the anode body 1 and the oxide film medium 2 is cut into 3.5*9mm, and the anode electrode part 7 and the cathode electrode part 4 are separated by insulating glue 5 . The cathode electrode part 4 was completely immersed in the first electrolyte solution (referring to the electrolyte solution used before making the solid electrolyte layer) at 85°C for treatment, and a voltage of 13V was applied for 30min. Afterwards, the solid electrolyte layer 3 is prepared in the cathode region by a conventional method, and then the carbon layer 41 and the silver layer 42 are prepared to obtain a monolithic capacitor element. The first electrolytic solution among the present embodiment is by 150g / L ammonium adipate, accounts for the 1.0wt% stearyl stearate of electrolytic solution total amount, and the remainder is made up of water and ethylene glycol (the ratio of the two is 3:1). Among them, ammoniu...

Embodiment 2

[0025] Please combine figure 1 and figure 2 As shown, the 13VF aluminum foil 6 including the anode body 1 and the oxide film medium 2 is cut into a size of 3.5*9mm, and the anode electrode part 7 and the cathode electrode part 4 are separated by insulating glue 5 . The cathode electrode part 4 was completely immersed in the first electrolytic solution at 85° C. for treatment, and a voltage of 13 V was applied for 30 minutes. Afterwards, the solid electrolyte layer 3 is prepared by chemical polymerization in the cathode area, and the cathode electrode part 4 covering the solid electrolyte layer 3 is completely immersed in the second electrolyte solution at 25°C (referring to the electrolytic solution used in the process of making the solid electrolyte layer). solution), and applied a voltage of 13V for 30min. Then continue to prepare the solid electrolyte layer 3 by chemical polymerization, and then completely immerse the cathode electrode part 4 covering the solid electroly...

Embodiment 3

[0027] The difference from Example 1 is that the first electrolyte is composed of 10 g / L ammonium citrate, 0.001 wt% cetyltrimethylammonium bromide and the remaining water, accounting for the total amount of the electrolyte. Wherein, ammonium citrate is a chemical-forming electrolyte, cetyltrimethylammonium bromide is a cationic surfactant, and water is a solvent. All the other are identical with embodiment 1.

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Abstract

The invention provides an electrolyte used for treating an aluminium foil in an aluminium electrolytic capacitor. A surfactant used for reducing surface tension of the electrolyte and improving infiltration of solution on the surface of the aluminium foil is added into the electrolyte, and is at least one of an anionic surfactant, a cationic surfactant, an ampholytic surfactant and a nonionic surfactant. The surfactant can obviously reduce the surface tension, improve the infiltration of the solution on the surface of the aluminium foil, and greatly improve the capacity of the electrolyte of reaching the surface of the aluminium foil to corrode hole walls and hole bottoms, so an oxidation film on the surface of the aluminium foil is fully repaired, and the leakage current and the reliability of the electrolytic capacitor are greatly improved. The electrolyte has the advantages of readily available raw materials and strong operability in the preparation process, and is suitable for large-scale technological improvement and promotion.

Description

【Technical field】 [0001] The invention relates to an electrolytic solution, in particular to an electrolytic solution for treating aluminum foil in an aluminum electrolytic capacitor. 【Background technique】 [0002] Capacitors belong to the basic components of the electronic information industry. They are the most widely used and irreplaceable electronic components. Their output accounts for about 40% of the electronic components. The variety is increasing, and the demand for matching capacitors is also increasing. The performance, variety and quality of capacitors directly determine or affect the development of electronic information products. [0003] In order to solve the problem of adapting the traditional liquid electrolytic capacitor to surface mount technology, chip type and miniaturization, it is necessary to solve the solidification of the electrolyte. Solid electrolytic capacitors have many advantages such as smaller size, better performance, wide temperature ran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06H01G9/055H01G9/07H01G9/15
Inventor 张易宁曾台彪陈素晶
Owner FUJIAN GUOGUANG ELECTRONICS SCI & TECHCO
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