CN113674998B - High-voltage-resistant solid aluminum electrolytic capacitor and preparation method thereof - Google Patents
High-voltage-resistant solid aluminum electrolytic capacitor and preparation method thereof Download PDFInfo
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- CN113674998B CN113674998B CN202110838556.8A CN202110838556A CN113674998B CN 113674998 B CN113674998 B CN 113674998B CN 202110838556 A CN202110838556 A CN 202110838556A CN 113674998 B CN113674998 B CN 113674998B
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- electrolytic capacitor
- aluminum electrolytic
- pedot
- voltage
- starch
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- 239000003990 capacitor Substances 0.000 title claims abstract description 39
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 34
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title description 8
- 239000006185 dispersion Substances 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000011888 foil Substances 0.000 claims abstract description 30
- 229920002472 Starch Polymers 0.000 claims abstract description 24
- 235000019698 starch Nutrition 0.000 claims abstract description 24
- 239000008107 starch Substances 0.000 claims abstract description 24
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 11
- 108010025899 gelatin film Proteins 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000005470 impregnation Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 6
- 229920000856 Amylose Polymers 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 150000001408 amides Chemical class 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 claims 8
- 125000003158 alcohol group Chemical group 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 229920000642 polymer Polymers 0.000 abstract description 10
- 229920000144 PEDOT:PSS Polymers 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 preferably Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A high-pressure resistant solid aluminum electrolytic capacitor comprises a shell, a core packet and a rubber plug, wherein the core packet is hermetically arranged in the shell through the rubber plug; the core package is formed by winding an anode foil, electrolytic paper and a cathode foil, a high-molecular conductive gel film is formed between the anode foil and the cathode foil, and the high-molecular conductive gel film comprises gel formed by starch; the weight of the starch in the high molecular conductive polymer is 20-50%. In the invention, a certain amount of starch is added into the dispersion liquid, and the starch and PEDOT: PSS form a layer of polymer conductive gel between the anode foil and the cathode foil after being dried, and under the action of the gel, the voltage resistance value of the polymer conductive gel is improved even if the surface of the anode foil leaks current, thereby improving the voltage resistance value of the solid-state aluminum electrolytic capacitor.
Description
Technical Field
The invention relates to an aluminum electrolytic capacitor, in particular to a high-voltage-resistant solid aluminum electrolytic capacitor and a preparation method thereof.
Background
Compared with a liquid aluminum electrolytic capacitor, the solid aluminum electrolytic capacitor has no electrolyte, so that the possibility of electrolyte leakage does not exist, and the safety performance of the solid aluminum electrolytic capacitor is incomparable with that of the liquid aluminum electrolytic capacitor. However, since the solid aluminum electrolytic capacitor has no electrolyte, the damage of the anode foil on the surface of the anode foil cannot be repaired during the production process, so that the solid aluminum electrolytic capacitor has the biggest problem of large leakage current, and the corresponding solid aluminum electrolytic capacitor has poor high voltage resistance because the oxide film on the surface of the anode foil cannot be effectively repaired.
The voltage withstanding value of the high-voltage (50-100V) solid aluminum electrolytic capacitor on the market at present is obviously insufficient, short circuit is easily caused in the using process, and the market demand cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-voltage-resistant solid aluminum electrolytic capacitor and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a high-voltage-resistant solid aluminum electrolytic capacitor comprises a shell, a core package and a rubber plug, wherein the core package is hermetically arranged in the shell through the rubber plug; the core package is formed by winding an anode foil, electrolytic paper and a cathode foil, a high-molecular conductive gel film is formed between the anode foil and the cathode foil, and the high-molecular conductive gel film comprises gel formed by starch; the weight of the starch in the high molecular conductive polymer is 20-50%.
In the high-voltage-resistant solid aluminum electrolytic capacitor, preferably, the high-molecular conductive polymer includes PEDOT and derivatives thereof.
Preferably, the high-molecular conductive polymer comprises PEDOT/PSS, and the weight ratio of PEDOT to PSS in the PEDOT/PSS is 1.
In the above high-voltage-resistant solid aluminum electrolytic capacitor, preferably, the starch is amylose.
The preparation method of the high-voltage-resistant solid aluminum electrolytic capacitor comprises the following steps:
1) Preparing a dispersion liquid, namely adding an organic solvent into a PEDOT (polymer dispersed OT) PSS dispersion liquid, mixing and stirring uniformly to form a PEDOT (polymer dispersed OT) PSS dispersion liquid for solid capacitors, and then dispersing starch into the PEDOT (polymer dispersed OT) PSS dispersion liquid to form a PEDOT (polymer dispersed OT) PSS dispersion liquid with a gel property, wherein the adding amount of the starch is 1-5% of the total weight of the dispersion liquid;
2) Core package impregnation, wherein the core package is impregnated in the dispersion liquid, and the core package is impregnated with the dispersion liquid in a vacuum impregnation, heating impregnation or pressurization impregnation mode;
3) Drying to form a film, namely drying the core bag impregnated with the dispersion liquid at the temperature of 50-120 ℃ to enable the dispersion liquid in the core bag to form a high-molecular conductive gel film;
4) And (6) assembling.
In the above method for manufacturing a high-voltage-resistant solid aluminum electrolytic capacitor, preferably, the organic solvent includes alcohols or amides.
In the preparation method of the high-voltage-resistant solid aluminum electrolytic capacitor, preferably, after the step 2) is completed, the excessive dispersion liquid at the bottom of the core package is adsorbed by adsorption paper.
In the preparation method of the high-voltage-resistant solid aluminum electrolytic capacitor, preferably, the core package is impregnated with the electrolyte after the step 3) is completed.
Compared with the prior art, the invention has the advantages that: in the invention, a certain amount of starch is added into the dispersion liquid, and the starch and PEDOT: PSS form a layer of polymer conductive gel between the anode foil and the cathode foil after being dried, and under the action of the gel, the voltage resistance value of the polymer conductive gel is improved even if the surface of the anode foil leaks current, thereby improving the voltage resistance value of the solid-state aluminum electrolytic capacitor.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully and in detail with reference to the preferred embodiments, but the scope of the invention is not limited to the specific embodiments described below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example 1
A high-pressure resistant solid aluminum electrolytic capacitor comprises a shell, a core packet and a rubber plug, wherein the core packet is hermetically arranged in the shell through the rubber plug; the core package is formed by winding an anode foil, electrolytic paper and a cathode foil, a high-molecular conductive gel film is formed between the anode foil and the cathode foil, and the high-molecular conductive gel film comprises gel formed by amylose; the weight of the starch in the high molecular conductive polymer is 20-50%. The high-molecular conductive polymer is PEDOT/PSS, wherein the weight ratio of PEDOT to PSS in the PEDOT/PSS is 1.
In the embodiment, the traditional high-molecular conductive polymer is changed into high-molecular conductive gel between the anode foil and the cathode foil, and the high-molecular conductive gel formed by amylose and PEDOT (PSS) has a greatly improved high-voltage withstand voltage value compared with the traditional high-molecular conductive polymer; thereby improving the high voltage resistance of the solid-state aluminum electrolytic capacitor.
The embodiment also provides a preparation method of the high-voltage-resistant solid aluminum electrolytic capacitor, which comprises the following steps of:
1) Preparing a dispersion liquid, namely adding a small amount of organic solvent into the PEDOT/PSS dispersion liquid, uniformly mixing and stirring to form the PEDOT/PSS dispersion liquid for the solid capacitor, then dispersing starch into the PEDOT/PSS dispersion liquid, uniformly mixing and stirring to form the gel PEDOT/PSS dispersion liquid, wherein the adding amount of the starch is 2 percent of the total weight of the dispersion liquid
2) Core package impregnation, wherein the core package is impregnated in the dispersion liquid, and the core package is impregnated with the dispersion liquid in a vacuum impregnation, heating impregnation or pressurization impregnation mode; and 2) adsorbing redundant dispersion liquid at the bottom of the core bag by using adsorption paper after the step 2) is finished.
3) Drying to form a film, namely drying the core bag impregnated with the dispersion liquid at the temperature of 50-120 ℃ to enable the dispersion liquid in the core bag to form a high-molecular conductive gel film; and 3) impregnating the core package with electrolyte after the step is finished.
4) And (6) assembling.
In this embodiment, the organic solvent includes alcohols or amides.
In this example, the addition of starch to the PEDOT: PSS dispersion did not increase the viscosity of the dispersion, which did not affect the core wrap impregnation dispersion. More rarely, the gel formed by amylose is not sticky and agglomerated after being broken; the process of forming the gel from the starch dispersion does not cause swelling and has little effect on the performance of the core package.
To test the high voltage resistance of the solid state capacitor of the present example, comparative example 1 was set. The comparative example 1 is identical to the example except that no starch is added. The products of comparative example 1 and this example (specification 100V, 82. Mu.F) were tested at 10pcs each. And (3) testing conditions are as follows: and (3) testing conditions: the initial voltage was 130V, and 5V was added every 5 seconds until the capacitor was short circuited, and the current was set to 1A.
| Voltage of | 130V | 135V | 140V | 145V | 150V | 155V | 160V |
| Comparative example 1 | 4pcs short circuit | 6pcs short circuit | |||||
| Example 1 | 0 | 0 | 0 | 0 | 2pcs short circuit | 6pcs short circuit | 2pcs short circuit |
In the invention, a certain amount of starch is added into the dispersion liquid, and the starch and PEDOT: PSS form a layer of polymer conductive gel between the anode foil and the cathode foil after being dried, and under the action of the gel, the voltage resistance value of the polymer conductive gel is improved even if the surface of the anode foil leaks current, thereby improving the voltage resistance value of the solid-state aluminum electrolytic capacitor.
Claims (7)
1. A high-voltage-resistant solid aluminum electrolytic capacitor is characterized in that: the core bag is hermetically arranged in the shell through the rubber plug; the core package is formed by winding an anode foil, electrolytic paper and a cathode foil, a high-molecular conductive gel film is formed between the anode foil and the cathode foil, and the high-molecular conductive gel film comprises gel formed by starch; the weight of the starch in the high molecular conductive polymer is 20-50%; the starch is amylose.
2. The high voltage resistant solid aluminum electrolytic capacitor of claim 1, wherein: the high-molecular conductive polymer comprises PEDOT and derivatives thereof.
3. The high voltage resistant solid aluminum electrolytic capacitor of claim 2, wherein: the high-molecular conductive polymer comprises PEDOT/PSS, wherein the weight ratio of PEDOT to PSS in the PEDOT/PSS is 1.
4. The method for manufacturing a high-voltage-resistant solid aluminum electrolytic capacitor according to any one of claims 1 to 3, wherein: the method comprises the following steps:
1) Preparing a dispersion, namely adding an organic solvent into a PEDOT (PSS) dispersion, mixing and stirring uniformly to form a PEDOT (PSS) dispersion for a solid capacitor, then dispersing starch into the PEDOT (PSS) dispersion, mixing and stirring uniformly to form a gel PEDOT (PSS) dispersion, wherein the adding amount of the starch is 1-5% of the total weight of the dispersion;
2) Core package impregnation, wherein the core package is impregnated in the dispersion liquid, and the core package is impregnated with the dispersion liquid in a vacuum impregnation, heating impregnation or pressurization impregnation mode;
3) Drying to form a film, namely drying the core bag impregnated with the dispersion liquid at the temperature of 50-120 ℃ to enable the dispersion liquid in the core bag to form a high-molecular conductive gel film;
4) And (6) assembling.
5. The method for preparing the high-voltage-resistant solid aluminum electrolytic capacitor according to claim 4, wherein the method comprises the following steps: the solvent is alcohol or amide.
6. The method for preparing the high-voltage-resistant solid aluminum electrolytic capacitor according to claim 4, wherein the method comprises the following steps: and 2) adsorbing redundant dispersion liquid at the bottom of the core bag by using adsorption paper after the step 2) is finished.
7. The method for preparing the high-voltage-resistant solid aluminum electrolytic capacitor according to claim 4, wherein: and 3) impregnating the core package with electrolyte after the step 3) is finished.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110838556.8A CN113674998B (en) | 2021-07-23 | 2021-07-23 | High-voltage-resistant solid aluminum electrolytic capacitor and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110838556.8A CN113674998B (en) | 2021-07-23 | 2021-07-23 | High-voltage-resistant solid aluminum electrolytic capacitor and preparation method thereof |
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| Publication Number | Publication Date |
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| CN113674998A CN113674998A (en) | 2021-11-19 |
| CN113674998B true CN113674998B (en) | 2022-10-25 |
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| JP5242973B2 (en) * | 2007-08-23 | 2013-07-24 | 日本化学工業株式会社 | Electrolyte composition for electricity storage device and electricity storage device using the same |
| JP2010182426A (en) * | 2009-02-03 | 2010-08-19 | Nec Tokin Corp | Conductive polymer composition and manufacturing method thereof, and solid electrolytic capacitor using the conductive polymer composition |
| JP5726376B2 (en) * | 2011-05-24 | 2015-05-27 | ケメット エレクトロニクス コーポレーション | Solid electrolytic capacitor and method of forming the capacitor |
| WO2013094462A1 (en) * | 2011-12-19 | 2013-06-27 | テイカ株式会社 | Electrolyte capacitor, and method for producing same |
| JP6427877B2 (en) * | 2012-10-16 | 2018-11-28 | 三菱ケミカル株式会社 | Conductive composition and solid electrolytic capacitor obtained using the composition |
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