CN114255998A - Aluminum electrolytic capacitor anode foil and aluminum electrolytic capacitor - Google Patents
Aluminum electrolytic capacitor anode foil and aluminum electrolytic capacitor Download PDFInfo
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- CN114255998A CN114255998A CN202011008335.XA CN202011008335A CN114255998A CN 114255998 A CN114255998 A CN 114255998A CN 202011008335 A CN202011008335 A CN 202011008335A CN 114255998 A CN114255998 A CN 114255998A
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- anode foil
- capacitor
- aluminum electrolytic
- solvent
- additive
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- 239000011888 foil Substances 0.000 title claims abstract description 94
- 239000003990 capacitor Substances 0.000 title claims abstract description 62
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 29
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 150000003377 silicon compounds Chemical class 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004327 boric acid Substances 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims abstract description 11
- 229930195725 Mannitol Natural products 0.000 claims abstract description 11
- 235000010355 mannitol Nutrition 0.000 claims abstract description 11
- 239000000594 mannitol Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- IJKVHSBPTUYDLN-UHFFFAOYSA-N dihydroxy(oxo)silane Chemical compound O[Si](O)=O IJKVHSBPTUYDLN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002798 polar solvent Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 239000004111 Potassium silicate Substances 0.000 claims description 3
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 239000012046 mixed solvent Substances 0.000 claims description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000032683 aging Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 12
- 239000012530 fluid Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- 239000002131 composite material Substances 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- 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
-
- 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
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention provides an aluminum electrolytic capacitor anode foil which comprises an anode foil pretreated by a treatment solution, wherein the treatment solution comprises a silicon compound, a solvent and an additive, and the additive comprises one or more of boric acid, mannitol and sebacic acid, so that the silicon content on the anode foil is 50-1000 ppm. The invention also provides a preparation method of the anode foil of the aluminum electrolytic capacitor and the aluminum electrolytic capacitor. The anode foil provided by the invention is soaked by the treatment liquid, so that the withstand voltage of the anode foil can be improved, the leakage current of the capacitor can be reduced, the aging gas production of the capacitor can be reduced, and the service life of the capacitor of the anode foil can be prolonged.
Description
Technical Field
The invention belongs to the technical field of aluminum electrolytic capacitors, and particularly relates to an aluminum electrolytic capacitor anode foil and an aluminum electrolytic capacitor.
Background
The aluminum electrolytic capacitor is one of three important components, and can realize the functions of filtering, bypassing, coupling, energy storage and the like in a circuit. With the continuous progress and development of the electronic industry, the performance requirements on the capacitor are higher and higher, and the requirements mainly include long service life, high voltage resistance, low leakage current, low gas generation and the like. And the improvement of the performance of the anode foil is very important for improving the relevant performance of the aluminum electrolytic capacitor. The existing method for improving the performance of the anode foil is to introduce silicon dioxide with high dielectric property into a composite film on the surface of the anode foil, so that the dielectric property of the composite film is improved, and the voltage resistance is improved. However, if only silicon dioxide is added into the electrolyte, the prepared capacitor still has the problems of low voltage resistance value, high leakage current and short service life.
Disclosure of Invention
The invention aims to solve the technical problems of low voltage withstanding value, high leakage current and short service life of a capacitor using an anode foil in the prior art, and provides an aluminum electrolytic capacitor anode foil and an aluminum electrolytic capacitor.
The technical scheme adopted by the invention for solving the problems is as follows:
in a first aspect, the present invention provides an aluminum electrolytic capacitor anode foil comprising:
an anode foil pretreated with the treatment liquid;
the treatment liquid comprises a silicon compound, a solvent and an additive;
the additive comprises one or more of boric acid, mannitol, and sebacic acid;
the silicon content on the anode foil is 50-1000 ppm.
Optionally, the total weight of the treatment fluid is 100%, the content of the silicon compound is 2% -30%, the content of the solvent is 60% -96%, and the content of the additive is 2% -10%.
Optionally, the total weight of the treatment fluid is 100%, the content of the silicon compound is 5% -20%, the content of the solvent is 72% -90%, and the content of the additive is 5% -8%.
Optionally, the silicon compound comprises one or more of silicon oxide, silicic acid and silicate.
Optionally, the silicon oxide is silicon dioxide, and the silicate comprises sodium silicate and potassium silicate.
Optionally, the solvent comprises one or two of water and a mixed solvent composed of water and an organic polar solvent;
the organic polar solvent includes ethylene glycol and diethylene glycol.
The invention provides an anode foil soaked by a treatment fluid, wherein the treatment fluid selects a silicon compound as a solute, and one or more of boric acid, mannitol and sebacic acid are added as an additive and a solvent, so that the silicon content on the anode foil is 50-1000 ppm.
In a second aspect, the present invention also provides a method for preparing the anode foil, which comprises the following steps:
cutting the foil according to the size of the required capacitor to obtain a first anode foil;
immersing the first anode foil into a treatment solution, and drying to obtain the anode foil;
the treatment liquid comprises a silicon compound, a solvent and an additive;
the additive comprises one or more of boric acid, mannitol, and sebacic acid;
the silicon content on the anode foil is 50-1000 ppm.
Because the side surface of the cut aluminum foil lacks an oxide film and an insulating film, the anode foil provided by the invention is a first anode foil which is cut into an aluminum foil with a proper size according to the requirement of a capacitor, the first anode foil is immersed into a treatment solution for pretreatment, wherein the treatment solution comprises a silicon compound, a solvent and an additive, the additive comprises one or more of boric acid, mannitol and sebacic acid, so that the silicon content on the anode foil is 50-1000 ppm, and the silicon-containing film is repaired and supplemented by the treatment solution, thereby improving the withstand voltage of the anode foil, reducing the leakage current of the capacitor, reducing the aging gas production of the capacitor and prolonging the service life of the capacitor using the anode foil.
In a third aspect, the present invention also provides an aluminum electrolytic capacitor comprising a capacitor element, an electrolyte and an electrolytic solution, the capacitor element comprising a cathode foil, a separator and an anode foil as described above, the separator being located between the cathode foil and the anode foil.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention provides an anode foil of an aluminum electrolytic capacitor, which comprises:
an anode foil pretreated with the treatment liquid;
the treatment liquid comprises a silicon compound, a solvent and an additive;
the additive comprises one or more of boric acid, mannitol, and sebacic acid;
the silicon content on the anode foil is 50-1000 ppm.
According to the anode foil pretreated by the treatment fluid, the treatment fluid selects a silicon compound as a solute, and one or more of boric acid, mannitol and sebacic acid are added as an additive and a solvent, so that the silicon content on the anode foil is 50-1000 ppm.
In some embodiments of the present invention, the silicon compound is present in an amount of 2% to 30%, the solvent is present in an amount of 60% to 96%, and the additive is present in an amount of 2% to 10%, based on 100% by weight of the total treatment fluid.
The content of the silicon compound is controlled within the range of 2-30%, the voltage withstanding degree of the anode foil is effectively improved, the service life of the capacitor can be obviously prolonged, and the leakage current is reduced. If the content of the silicon compound is more than 30%, the capacity fade of the capacitor is increased to reduce the life span of the capacitor.
In some embodiments of the present invention, the silicon compound is present in an amount of 5% to 20%, the solvent is present in an amount of 72% to 90%, and the additive is present in an amount of 5% to 8%, based on 100% by weight of the total treatment fluid.
In some embodiments of the present invention, the silicon compound comprises one or more of silicon oxide, silicic acid, and silicate.
Adding a silicon-containing compound into the treatment solution, and pretreating the anode foil by using the treatment solution; since the silicon-containing compound has high dielectric properties, the compressive strength of the anode foil is increased.
In some embodiments of the invention, the silicon oxide is silicon dioxide and the silicate comprises sodium silicate and potassium silicate.
In some embodiments of the present invention, the solvent includes one or both of water and a mixed solvent of water and an organic polar solvent;
the organic polar solvent includes ethylene glycol and diethylene glycol.
The invention also provides a preparation method of the anode foil, which comprises the following steps:
cutting the foil according to the size of the required capacitor to obtain a first anode foil;
immersing the first anode foil into a treatment solution, and drying to obtain the anode foil;
the treatment liquid comprises a silicon compound, a solvent and an additive;
the additive comprises one or more of boric acid, mannitol, and sebacic acid.
Because the side surface of the cut aluminum foil lacks an oxide film and an insulating film, the anode foil provided by the invention is a first anode foil which is cut into an appropriate size according to the requirement of a capacitor, and the first anode foil is immersed into a treatment solution for pretreatment, wherein the treatment solution comprises a silicon compound, a solvent and an additive, the additive comprises one or more of boric acid, mannitol and sebacic acid, and the silicon-containing film is repaired and supplemented by the treatment solution, so that the withstand voltage of the anode foil can be improved, the leakage current of the capacitor can be reduced, the aging gas production of the capacitor can be reduced, and the service life of the capacitor using the anode foil provided by the invention can be prolonged.
In some embodiments of the invention, the capacitor has a specification of 450V330uF30 x 45, and the first anode foil has a withstand voltage of 660VF and a width of 35 mm.
The invention also provides an aluminum electrolytic capacitor, which comprises a capacitor element and electrolyte, wherein the capacitor element comprises a cathode foil, a diaphragm and the anode foil, and the diaphragm is positioned between the cathode foil and the anode foil.
The present invention will be further illustrated by the following examples. It is to be understood that the present invention is not limited to the following embodiments, and methods are regarded as conventional methods unless otherwise specified. Materials are commercially available from the open literature unless otherwise specified.
Example 1
This example is for explaining the electrolytic capacitor anode foil and the method for producing the same disclosed in the present invention.
The preparation method of the anode foil of the aluminum electrolytic capacitor and the preparation of the treatment solution comprise the following steps:
preparation of a treatment solution: uniformly mixing water, silicon dioxide and boric acid with the contents shown in the table 1 by taking the total weight of the treatment liquid as 100 percent to obtain the treatment liquid;
pretreatment of electrolytic capacitor anode foil: cutting the whole anode foil with 660V withstand voltage into small rolls with the width of 35mm according to the specification of a required capacitor (the specification is 450V330uF30 x 45);
and (3) immersing the anode foil into the treatment solution for 20-40 s, and drying to obtain the aluminum electrolytic capacitor anode foil.
Examples 2 to 6
Examples 2 to 6 are for explaining the method of preparing the anode foil for aluminum electrolytic capacitors and the preparation of the treating solution disclosed in the present invention, and include most of the steps of example 1, except that:
the components and contents in the table 1 are adopted for the treatment liquid.
Comparative example 1
The comparative example 1 is used for comparative explanation of the anode foil of the aluminum electrolytic capacitor and the preparation method thereof disclosed by the invention, and comprises the following steps:
pretreatment of the anode foil of the aluminum electrolytic capacitor: the anode foil was cut to the width (35mm) required for the capacitor without being subjected to the impregnation treatment.
Comparative example 2
Comparative example 2 is used for comparative explanation of the preparation method of the anode foil for aluminum electrolytic capacitor and the preparation of the treating fluid disclosed in the present invention, which includes most of the operation steps in example 1, and the differences are as follows:
the components and contents in the table 1 are adopted for the treatment liquid.
TABLE 1
Wherein, the content is calculated by taking the total weight of the treating fluid as 100 percent.
Evaluation of Performance
The anode foils prepared in examples 1 to 6 and comparative examples 1 to 2 were subjected to electrical property test and silicon content test, and the test results are shown in Table 2.
TABLE 2
As can be seen from the test results in Table 2, in comparative examples 1 to 6 and comparative examples 1 to 2, the pressure resistance of the anode foil soaked by the treatment solution is improved, the leakage current is obviously reduced, and the boosting time is relatively shortened.
The anode foils prepared in examples 1 to 6 and comparative examples 1 to 2 were mounted on capacitors, and the capacitors were subjected to electrical property test and high temperature 115 ℃ load life test (450V330uF, 30 x 45 capacitors), and the test results are shown in table 3.
TABLE 3
As can be seen from the test results in table 3, in comparative examples 1 to 6 and comparative examples 1 to 2, the capacity attenuation of the capacitor is reduced, the initial value of the leakage current is small and the variation is small, the Δ DF variation rate is small and the variation in the height Δ L of the capacitor is small (i.e., the gas production amount is small) in examples 1 to 6.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An aluminum electrolytic capacitor anode foil, comprising:
an anode foil pretreated with the treatment liquid;
the treatment liquid comprises a silicon compound, a solvent and an additive;
the additive comprises one or more of boric acid, mannitol, and sebacic acid;
the silicon content on the anode foil is 50-1000 ppm.
2. The anode foil according to claim 1, wherein the silicon compound is contained in an amount of 2 to 30%, the solvent is contained in an amount of 60 to 96%, and the additive is contained in an amount of 2 to 10%, based on 100% by weight of the treatment liquid.
3. The anode foil according to claim 2, wherein the silicon compound is contained in an amount of 5 to 20%, the solvent is contained in an amount of 72 to 90%, and the additive is contained in an amount of 5 to 8%, based on 100% by weight of the treatment liquid.
4. The anode foil according to claim 1, wherein the silicon compound comprises one or more of silicon oxide, silicic acid and silicate.
5. The anode foil of claim 4, wherein the silicon oxide is silicon dioxide and the silicate comprises sodium silicate and potassium silicate.
6. The anode foil according to claim 1, wherein the solvent comprises one or both of water and a mixed solvent of water and an organic polar solvent;
the organic polar solvent includes ethylene glycol and diethylene glycol.
7. Method for the preparation of an anode foil according to any of claims 1-6, comprising the steps of:
cutting the foil according to the size of the required capacitor to obtain a first anode foil;
immersing the first anode foil into a treatment solution, and drying to obtain the anode foil;
the treatment liquid comprises a silicon compound, a solvent and an additive;
the additive comprises one or more of boric acid, mannitol, and sebacic acid;
the silicon content on the anode foil is 50-1000 ppm.
8. An aluminum electrolytic capacitor comprising a capacitor element and an electrolyte, the capacitor element comprising a cathode foil, a separator and an anode foil according to claims 1-6, the separator being located between the cathode foil and the anode foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011008335.XA CN114255998A (en) | 2020-09-23 | 2020-09-23 | Aluminum electrolytic capacitor anode foil and aluminum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011008335.XA CN114255998A (en) | 2020-09-23 | 2020-09-23 | Aluminum electrolytic capacitor anode foil and aluminum electrolytic capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114255998A true CN114255998A (en) | 2022-03-29 |
Family
ID=80788123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011008335.XA Pending CN114255998A (en) | 2020-09-23 | 2020-09-23 | Aluminum electrolytic capacitor anode foil and aluminum electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114255998A (en) |
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2020
- 2020-09-23 CN CN202011008335.XA patent/CN114255998A/en active Pending
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