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Method for manufacturing liquid tantalum electrolytic capacitors, and electrolyte preparation thereof

A tantalum electrolytic capacitor and a manufacturing method technology, applied in liquid electrolytic capacitors, electrolytic capacitors, capacitors and other directions, can solve problems such as capacity attenuation, and achieve the effects of increasing capacitance, reducing loss tangent value, and reducing loss angle tangent value

Active Publication Date: 2009-11-25
ZHUZHOU RIWANG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for low-voltage and high-capacity liquid tantalum electrolytic capacitors, it is not enough to increase the effective surface area S of the cathode to increase the cathode capacitance, because for low-voltage and high-capacity liquid tantalum electrolytic capacitors, it is particularly easy to form an electric double layer, so its electric double layer The thickness of the cathode greatly affects the value of the capacitance of the cathode, making it easy to cause capacity attenuation in low-voltage and large-capacity liquid tantalum electrolytic capacitors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A liquid tantalum electrolytic capacitor, suitable for rated working voltage Vr=6.3v~25v and CrVr≥15000 or specific capacitance of all tantalum powder≥10000CV / g. The manufacturing process of the liquid tantalum electrolytic capacitor is based on the traditional production process, and the platinum acid additive is added to the working electrolyte of the liquid tantalum electrolytic capacitor manufacturing process, and the preferred ratio of the electrolyte is:

[0028] Silica sol: sulfate: 10% platinum acid: concentrated sulfuric acid=150ml: 4g: 2ml: 50ml.

[0029] The preparation process is to adjust the platinum acid into a 10% aqueous solution, then add the platinum acid and sulfate into the silica sol in proportion, stir well, and then add the corresponding proportion of concentrated sulfuric acid and stir evenly to prepare the working electrolyte. Products with low rated working voltage, such as products with working voltage less than 25V, use more sulfate and chlo...

Embodiment 2

[0031] A liquid tantalum electrolytic capacitor, suitable for rated working voltage Vr=40v~63v and CrVr≥15000 or specific capacitance of all tantalum powder≥10000CV / g. The manufacturing process of the liquid tantalum electrolytic capacitor is based on the traditional production process, and the platinum acid additive is added to the working electrolyte of the liquid tantalum electrolytic capacitor manufacturing process. The preferred proportion of the electrolyte is:

[0032] Silica sol: sulfate: 10% platinum acid: concentrated sulfuric acid=150ml: 2g: 1.5ml: 50ml.

[0033] The platinum acid is formulated into a 10% aqueous solution, and then the platinum acid and sulfate are added to the silica sol in proportion, fully stirred evenly, and then the corresponding proportion of concentrated sulfuric acid is added and stirred evenly to obtain a working electrolyte. Products with medium rated working voltage, such as products with working voltage of 45V-50V, use different contents...

Embodiment 3

[0035] A liquid tantalum electrolytic capacitor, the rated operating voltage Vr≤50VR full capacity of the product after the above scheme is preferred, or the product with Vr=63v~75v and Cr≥150uF. The preferred ratio of its electrolyte is:

[0036] Silica sol: sulfate: 10% platinum acid: concentrated sulfuric acid = 150ml: 0.5g: 0.9ml: 50ml

[0037] The platinum acid is formulated into a 10% aqueous solution, and then the platinum acid and sulfate are added to the silica sol in proportion, fully stirred evenly, and then the corresponding proportion of concentrated sulfuric acid is added and stirred evenly to obtain a working electrolyte. For products with a high rated working voltage, such as products with a working voltage of 63V-75V, the preferred proportion of sulfate and chloroplatinate is that the sulfate accounts for 0.1-0.2% of the weight of the working electrolyte. Chloroplatinic acid aqueous solution accounted for 0.2 to 0.5.

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Abstract

The invention provides a method for manufacturing liquid tantalum electrolytic capacitors, and electrolyte preparation thereof. On the basis of the prior production process, additives are added to working electrolyte in a process of manufacturing liquid tantalum electrolytic capacitors so as to reduce hydrogen atoms or hydrogen molecules produced by H+ on the inner wall of a silver shell and increase the thickness of electric double layers. The electrolyte is shake-soluble working electrolyte, and consists of high-purity silica sol aqueous solution, concentrated sulfuric acid, sulfate, and hydrated chloroplatinic acid. A preparation method for the electrolyte comprises: taking 28 to 35 portions of silica sol, 9 to 12 portions of concentrated sulfuric acid, platinum aqueous solution accounting for 0.1 to 2 percent of the total weight of the electrolyte and 0.1 to 1.5 percent of sulfate according to volume ratio; preparing platinum acid into 8 to 10 percent aqueous solution; adding the platinum acid and the sulfate to the silica sol pro rata and mixing the three well; and adding corresponding proportion of concentrated sulfuric acid, mixing well and obtaining the working electrolyte.

Description

technical field [0001] The patent of the present invention relates to a manufacturing method of electronic components and the preparation of its process solution, in particular to a manufacturing method of a liquid tantalum electrolytic capacitor and its electrolyte preparation. It is mainly used in the production process of liquid tantalum electrolytic capacitors. technical background [0002] Liquid tantalum electrolytic capacitors are made by sintering anode tantalum block, forming in electrolyte to produce tantalum pentoxide oxide film, and then assembling in a silver shell filled with working electrolyte and extruding the mouth of the shell to seal. As the volume of liquid tantalum electrolytic capacitors is becoming smaller and smaller for electronic circuits, capacitor manufacturers must increase the specific capacity of tantalum powder used in tantalum core anode blocks in the design process of reducing the volume of liquid tantalum electrolytic capacitors. Generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/145H01G9/035
Inventor 刘建清袁益
Owner ZHUZHOU RIWANG ELECTRONICS TECH
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