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A method for manufacturing a cathode guide layer of a chip-type conductive polymer tantalum capacitor

A conductive polymer and tantalum capacitor technology, applied in electrolytic capacitors, capacitors, coatings, etc., can solve the problems of increased equivalent series resistance, reduced conductivity of the polymer layer, discontinuous conductive polymer layer, etc., to achieve improved The effect of continuity

Active Publication Date: 2018-05-11
SHENZHEN SURPASS STRUCTURE CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Because of Ta 2 o 5 The dielectric oxide film is oil-repellent, and the micropore size distribution of the dielectric film is uneven. For the large-diameter (>300nm) medium micropores without a guide layer, the weight of the adsorption solution on the surface of such micropores is less or due to gravity. It hangs to other parts, so the conductive polymer layer formed by polymerization is discontinuous and not dense, which reduces the conductivity of the polymer layer
The tantalum anode block without the cathode layer carrier, even if it is covered with a polymer layer, is prone to interlayer interface separation after thermal shock, resulting in an increase in interlayer contact resistance and a larger equivalent series resistance (ESR) of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Press tantalum powder with a specific volume of 50000 μF V / g into a tantalum compact according to a conventional method, and then sinter it into an anode tantalum block according to a conventional method;

[0037] 2) The anode tantalum block is immersed in nitric acid solution to prepare Ta 2 o 5 medium layer;

[0038] 3) Will prepare Ta 2 o 5 The anode tantalum block of the dielectric layer is immersed in the treatment solution with low water content, solvent and silica modification, and taken out at a speed of 1.0mm / min after immersion for 15 minutes; the pretreatment solution is prepared from the following raw materials in weight percentage: Aminosilane coupling agent 1.0%, fumed silica 0.01%, water 5%, methanol 60%, n-butanol 33.99%; place at 25°C for 20min, and dry at 180°C to form a film;

[0039] 4) Synthesize a conductive polymer film on the surface of the pretreated anode tantalum block as a cathode guiding layer according to a conventional method;

[0...

Embodiment 2

[0042] The difference from Example 1 is that the immersion time in step 3) is 10min, and the treatment liquid includes: 0.3% epoxy silane coupling agent, 0.01% fumed silica, 5% water, 60% ethanol, isopropanol 34.69%. Place at 25°C for 20min, and dry at 170°C to form a film.

Embodiment 3

[0044] The difference from Example 1 is that the immersion time in step 3) is 10 minutes, and the treatment liquid includes: 0.6% of aminosilane coupling agent, 0.2% of epoxy silane, 0.02% of fumed silica, 6% of water, 56% of methanol %, propanol 37.18%. Place at 25°C for 20min, and dry at 190°C to form a film.

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Abstract

The invention discloses a manufacturing method for a cathode guide layer of a chip-type conductive polymer tantalum capacitor. The manufacturing method comprises the following steps: dipping an anode tantalum block of which the surface is attached with a Ta<2>O<5> dielectric layer into a treating fluid for 1-2 minutes, and taking out the anode tantalum block at a speed of 0.01-5.0mm / min; placing the anode tantalum block at 20-30 DEG C for 5-30 minutes, and carrying out drying and film forming at 50-260 DEG C to form the cathode guide layer of the chip-type conductive polymer tantalum capacitor. The treating liquid comprises the following raw materials in percentage by weight: 0.005%-2.0% of a silane coupling agent, 0.01%-0.1% of fumed silica, 3%-15% of water and the balance of a solvent. The chip-type conductive polymer tantalum capacitor which is further prepared by the cathode guide layer of the chip-type conductive polymer tantalum capacitor manufactured by the manufacturing method has the characteristics of high capacity extraction ratio, low loss, low equivalent series resistance and low leak current.

Description

technical field [0001] The invention relates to a method for manufacturing a cathode guide layer of a sheet-type conductive polymer tantalum capacitor. Background technique [0002] Because of Ta 2 o 5 The dielectric oxide film is oil-repellent, and the micropore size distribution of the dielectric film is uneven. For the large-diameter (>300nm) medium micropores without a guide layer, the weight of the adsorption solution on the surface of such micropores is less or due to gravity. It hangs to other parts, so the conductive polymer layer formed by polymerization is discontinuous and not dense, which reduces the conductive performance of the polymer layer. A tantalum anode block without a cathode layer carrier, even if it is covered with a polymer layer, is prone to interlayer interface separation after thermal shock, resulting in an increase in the interlayer contact resistance and increasing the equivalent series resistance (ESR) of the product. Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042C09D183/04C09D7/61
CPCC08K3/36C09D7/61C09D183/04H01G9/0425
Inventor 曾台彪齐兆雄吴维芬曾宪旦方金富
Owner SHENZHEN SURPASS STRUCTURE CERAMICS CO LTD
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