CN118299187A - Solid-liquid mixed aluminum electrolytic capacitor and preparation method thereof - Google Patents
Solid-liquid mixed aluminum electrolytic capacitor and preparation method thereof Download PDFInfo
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- CN118299187A CN118299187A CN202410719354.5A CN202410719354A CN118299187A CN 118299187 A CN118299187 A CN 118299187A CN 202410719354 A CN202410719354 A CN 202410719354A CN 118299187 A CN118299187 A CN 118299187A
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- conductive high
- electrolytic capacitor
- pedot
- aluminum electrolytic
- solid
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 37
- 239000003990 capacitor Substances 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims description 8
- 229920000642 polymer Polymers 0.000 claims abstract description 43
- 239000002904 solvent Substances 0.000 claims abstract description 37
- 230000005496 eutectics Effects 0.000 claims abstract description 34
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 claims abstract description 13
- 235000019743 Choline chloride Nutrition 0.000 claims abstract description 13
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical compound [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 claims abstract description 13
- 229960003178 choline chloride Drugs 0.000 claims abstract description 13
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 13
- 239000004310 lactic acid Substances 0.000 claims abstract description 13
- 229920000144 PEDOT:PSS Polymers 0.000 claims abstract description 11
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 claims description 24
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- 239000003792 electrolyte Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 9
- 239000007800 oxidant agent Substances 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 9
- GKWLILHTTGWKLQ-UHFFFAOYSA-N 2,3-dihydrothieno[3,4-b][1,4]dioxine Chemical compound O1CCOC2=CSC=C21 GKWLILHTTGWKLQ-UHFFFAOYSA-N 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- WHRAZOIDGKIQEA-UHFFFAOYSA-L iron(2+);4-methylbenzenesulfonate Chemical compound [Fe+2].CC1=CC=C(S([O-])(=O)=O)C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1 WHRAZOIDGKIQEA-UHFFFAOYSA-L 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000011888 foil Substances 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 3
- 229920001940 conductive polymer Polymers 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The solid-liquid mixed aluminum electrolytic capacitor comprises a core package, a shell and a rubber plug, wherein the core package is hermetically arranged in the shell through the rubber plug; the core package is internally provided with a conductive high molecular polymer, and the conductive high molecular polymer comprises a eutectic solvent modified PEDOT: PSS; the eutectic solvent comprises choline chloride and lactic acid, and the molar ratio of the choline chloride to the lactic acid is 1:1-1:3. In the invention, a first conductive high polymer layer and a second conductive high polymer layer are formed in a core bag; the PEDOT-PSS in the first conductive high polymer layer is modified by the eutectic solvent to improve conductivity of the PEDOT-PSS and soften the PEDOT-PSS; thereby ensuring that the first conductive high polymer layer is contacted with the surface of the anode foil to lead out the capacitance of the aluminum electrolytic capacitor stably.
Description
Technical Field
The invention relates to an aluminum electrolytic capacitor, in particular to a solid-liquid mixed aluminum electrolytic capacitor and a preparation method thereof.
Background
The solid aluminum electrolytic capacitor adopts solid electrolyte, and because of the process and material limitation of the solid aluminum electrolytic capacitor, the solid aluminum electrolytic capacitor has smaller capacity and larger leakage current, and is only suitable for low-voltage products. In order to solve the leakage current of the solid aluminum electrolytic capacitor, the current industry practice is to impregnate a certain amount of electrolyte after forming the solid electrolyte, namely after forming the conductive high polymer film, so as to repair the damaged surface oxide film of the anode foil in the core package in the production process. However, heat is generated when the electrolyte repairs the oxide film, thereby affecting the contact of the conductive polymer with the surface of the anode foil at the repair site, resulting in a decrease in the capacitance extraction rate of the aluminum electrolytic capacitor.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a solid-liquid mixed aluminum electrolytic capacitor with stable capacitance extraction rate and low internal resistance and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the solid-liquid mixed aluminum electrolytic capacitor comprises a core package, a shell and a rubber plug, wherein the core package is hermetically arranged in the shell through the rubber plug; the core package is internally provided with a conductive high molecular polymer, and the conductive high molecular polymer comprises a eutectic solvent modified PEDOT: PSS; the eutectic solvent comprises choline chloride and lactic acid, and the molar ratio of the choline chloride to the lactic acid is 1:1-1:3.
In the solid-liquid mixed aluminum electrolytic capacitor, preferably, the core pack is impregnated with the electrolyte after the conductive polymer is formed on the core pack.
In the solid-liquid mixed aluminum electrolytic capacitor, preferably, the conductive high molecular polymer includes a first conductive high molecular polymer layer and a second conductive high molecular polymer layer; the first conductive high molecular polymer layer comprises a eutectic solvent modified PEDOT: PSS; the second conductive high polymer layer comprises PEDOT or one of the derivatives thereof.
The preparation method of the solid-liquid mixed aluminum electrolytic capacitor preferably comprises the following steps: 1) Preparing a eutectic solvent; uniformly mixing choline chloride and lactic acid, and heating to 60-80 ℃ to form homogeneous liquid; obtaining a eutectic solvent for standby;
2) Adding PEDOT and PSS into deionized water, and then adding a eutectic solvent to form a dispersion liquid A; the weight of the added eutectic solvent is 5-20% of the weight of PEDOT and PSS; the weight concentration of PEDOT and PSS in deionized water is 1% -5%;
3) The core package is heated, impregnated and dispersed A, the impregnation time is 0.5-2 hours, and a first conductive high polymer layer is formed after drying;
4) The core of the step 3) is respectively impregnated with the EDOT dispersion liquid and the oxidant, and then heated and polymerized to form a first conductive high polymer layer;
5) Washing with deionized water to remove excessive oxidant, and oven drying
6) Impregnating the electrolyte.
In the above method for preparing a solid-liquid mixed aluminum electrolytic capacitor, preferably, the heating temperature in the step 4) is 50 ℃ to 120 ℃.
In the above preparation method of the solid-liquid mixed aluminum electrolytic capacitor, preferably, the molar ratio of the choline chloride to the lactic acid is 1:1-1:3.
In the above method for preparing a solid-liquid mixed aluminum electrolytic capacitor, preferably, the solvent of the EDOT dispersion in the step 4) includes one or more of absolute methanol, absolute ethanol, absolute propanol, ethylene glycol, DMF or acetone.
In the above method for preparing a solid-liquid mixed aluminum electrolytic capacitor, preferably, the oxidant includes one or more of iron p-toluenesulfonate, ammonium persulfate and sodium persulfate.
Compared with the prior art, the invention has the advantages that: in the invention, a first conductive high polymer layer and a second conductive high polymer layer are formed in a core bag; the PEDOT-PSS in the first conductive high polymer layer is modified by the eutectic solvent to improve conductivity of the PEDOT-PSS and soften the PEDOT-PSS; thereby ensuring that the first conductive high polymer layer is contacted with the surface of the anode foil to lead out the capacitance of the aluminum electrolytic capacitor stably.
Detailed Description
The present invention will be described more fully hereinafter with reference to the preferred embodiments for the purpose of facilitating understanding of the present invention, but the scope of protection of the present invention is not limited to the specific embodiments described below.
It will be understood that when an element is referred to as being "fixed, affixed, connected, or in communication with" another element, it can be directly fixed, affixed, connected, or in communication with the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention.
Example 1
The embodiment provides a solid-liquid mixed aluminum electrolytic capacitor, which comprises a core package, a shell and a rubber plug, wherein the core package is hermetically arranged in the shell through the rubber plug; the core package is internally provided with a conductive high molecular polymer. In this embodiment, the core pack is impregnated with an electrolyte after a conductive polymer is formed thereon; the electrolyte is used for repairing the oxide film on the surface of the anode foil damaged in the production process.
In this embodiment, the conductive high molecular polymer includes a first conductive high molecular polymer layer and a second conductive high molecular polymer layer; the first conductive high molecular polymer layer is a eutectic solvent modified PEDOT: PSS; the eutectic solvent comprises choline chloride and lactic acid, and the molar ratio of the choline chloride to the lactic acid is 1:1-1:3, preferably 1:2. The second conductive high polymer layer is PEDOT.
In this example, the eutectic solvent pair PEDOT: when PSS is modified, the dipoles in the eutectic solvent can act on PEDOT: PSS in the PSS is replaced; in particular, the addition of the eutectic solvent reduces the coulombic force between PEDOT and PSS, thereby destroying PEDOT: the core-shell structure of the PSS enables the PEDOT to be exposed from the PSS shell, and improves the PEDOT: conductivity of PSS.
Modification of the eutectic solvent in this example, such that the formed eutectic solvent modified PEDOT: PSS films exhibit a gelatinous trend, i.e. modification of the eutectic solvent softens the PEDOT: PSS film. In the charge-discharge cycle of the aluminum electrolytic capacitor, the conductive high polymer can continuously expand and shrink along with the charge-discharge process; in the conventional solid-liquid mixed aluminum electrolytic capacitor, PEDOT is generated in the process of continuously expanding and contracting: the PSS film or the PEDOT film is detached from the anode foil, and thus the capacitance of the aluminum electrolytic capacitor is reduced. In this example, the eutectic solvent modified PEDOT is formed in the core package: a PSS film; whereas eutectic solvent modified PEDOT: PSS films exhibit a gelatinous tendency, which gives PEDOT at the surface of the anode foil: shrinkage and expansion of the PSS film or the PEDOT film provide a space for elasticity, and PEDOT is not easily present: the PSS film or the PEDOT film is separated from the anode foil, thereby ensuring the stability of the capacitance extraction of the aluminum electrolytic capacitor.
The embodiment also provides a preparation method of the solid-liquid mixed aluminum electrolytic capacitor, which comprises the following steps:
1) Preparing a eutectic solvent; uniformly mixing choline chloride and lactic acid in a molar ratio of 1:1-1:3, and heating to 60-80 ℃ to form homogeneous liquid; obtaining a eutectic solvent for standby;
2) Adding PEDOT and PSS into deionized water, and then adding a eutectic solvent to form a dispersion liquid A; the weight of the added eutectic solvent is 5-20% of the weight of PEDOT and PSS; the weight concentration of PEDOT and PSS in deionized water is 1% -5%;
3) The core package is heated, impregnated and dispersed A, the impregnation time is 0.5-2 hours, and a first conductive high polymer layer is formed after drying;
4) The core of the step 3) is respectively impregnated with the EDOT dispersion liquid and the oxidant, and then heated and polymerized at 50-120 ℃ to form a second conductive high polymer layer; the solvent of the EDOT dispersion comprises one or more of absolute methanol, absolute ethanol, absolute propanol, ethylene glycol, DMF, or acetone.
5) Washing with deionized water to remove redundant oxidant, and drying; the oxidant can be one or more of iron p-toluenesulfonate, ammonium persulfate and sodium persulfate.
6) Impregnating the electrolyte; the electrolyte may be a conventional electrolyte such as polyethylene glycol (PEG) 35%, ethylene Glycol (EG) 15%, gamma-butyrolactone 10% (GBL), ethanol 15%, water 20% and phthalic acid 5% by weight. .
In this embodiment, first, a first conductive high polymer layer and a second conductive high polymer layer are formed in a core pack; the PEDOT-PSS in the first conductive high polymer layer is modified by the eutectic solvent to improve conductivity of the PEDOT-PSS and soften the PEDOT-PSS; thereby ensuring that the first conductive high polymer layer is contacted with the surface of the anode foil to lead out the capacitance of the aluminum electrolytic capacitor stably.
Comparative example 1
In comparative example 1, the first conductive high molecular polymer layer was PEDOT: PSS, without eutectic solvent modification. The other parts are the same as in example 1.
The products of example 1 and comparative example 1 were each produced, and the products of example 1 and comparative example 1 were solid-liquid aluminum electrolytic capacitors having a rated voltage of 36V and an electrostatic capacity of 300. Mu.F. The products of example 1 and comparative example 1 were respectively selected at 50pcs, and tested for average internal resistance, average initial capacitance, and capacitance retention after 8000 cycles, and the results are shown in the following table:
。
Claims (8)
1. A solid-liquid mixed aluminum electrolytic capacitor is characterized in that: the rubber plug comprises a core bag, a shell and a rubber plug, wherein the core bag is hermetically arranged in the shell through the rubber plug; the core package is internally provided with a conductive high molecular polymer, and the conductive high molecular polymer comprises a eutectic solvent modified PEDOT: PSS; the eutectic solvent comprises choline chloride and lactic acid, and the molar ratio of the choline chloride to the lactic acid is 1:1-1:3.
2. The solid-liquid mixed aluminum electrolytic capacitor according to claim 1, wherein: after the conductive high molecular polymer is formed on the core bag, the core bag is impregnated with electrolyte.
3. The solid-liquid mixed aluminum electrolytic capacitor according to claim 1, wherein: the conductive high molecular polymer comprises a first conductive high molecular polymer layer and a second conductive high molecular polymer layer; the first conductive high molecular polymer layer comprises a eutectic solvent modified PEDOT: PSS; the second conductive high polymer layer comprises PEDOT or one of the derivatives thereof.
4. The preparation method of the solid-liquid mixed aluminum electrolytic capacitor is characterized by comprising the following steps of:
1) Preparing a eutectic solvent; uniformly mixing choline chloride and lactic acid, and heating to 60-80 ℃ to form homogeneous liquid; obtaining a eutectic solvent for standby;
2) Adding PEDOT and PSS into deionized water, and then adding a eutectic solvent to form a dispersion liquid A; the weight of the added eutectic solvent is 5-20% of the weight of PEDOT and PSS; the weight concentration of PEDOT and PSS in deionized water is 1% -5%;
3) The core package is heated, impregnated and dispersed A, the impregnation time is 0.5-2 hours, and a first conductive high polymer layer is formed after drying;
4) The core of the step 3) is respectively impregnated with the EDOT dispersion liquid and the oxidant, and then heated and polymerized to form a second conductive high polymer layer;
5) Washing with deionized water to remove redundant oxidant, and drying;
6) Impregnating the electrolyte.
5. The method for manufacturing a solid-liquid mixed aluminum electrolytic capacitor according to claim 4, wherein: the heating temperature in the step 4) is 50-120 ℃.
6. The method for manufacturing a solid-liquid mixed aluminum electrolytic capacitor according to claim 4, wherein: the mol ratio of the choline chloride to the lactic acid is 1:1-1:3.
7. The method for manufacturing a solid-liquid mixed aluminum electrolytic capacitor according to claim 4, wherein: the solvent of the EDOT dispersion in the step 4) comprises one or more of absolute methanol, absolute ethanol, absolute propanol, ethylene glycol, DMF or acetone.
8. The method for manufacturing a solid-liquid mixed aluminum electrolytic capacitor according to claim 4, wherein: the oxidant comprises one or more of iron p-toluenesulfonate, ammonium persulfate and sodium persulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410719354.5A CN118299187A (en) | 2024-06-05 | 2024-06-05 | Solid-liquid mixed aluminum electrolytic capacitor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410719354.5A CN118299187A (en) | 2024-06-05 | 2024-06-05 | Solid-liquid mixed aluminum electrolytic capacitor and preparation method thereof |
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| CN118299187A true CN118299187A (en) | 2024-07-05 |
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| CN202410719354.5A Pending CN118299187A (en) | 2024-06-05 | 2024-06-05 | Solid-liquid mixed aluminum electrolytic capacitor and preparation method thereof |
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| Country | Link |
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| CN (1) | CN118299187A (en) |
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- 2024-06-05 CN CN202410719354.5A patent/CN118299187A/en active Pending
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