CN109545564B - Carbon-coated aluminum foil for solid aluminum capacitor and preparation method thereof - Google Patents
Carbon-coated aluminum foil for solid aluminum capacitor and preparation method thereof Download PDFInfo
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- CN109545564B CN109545564B CN201811418740.1A CN201811418740A CN109545564B CN 109545564 B CN109545564 B CN 109545564B CN 201811418740 A CN201811418740 A CN 201811418740A CN 109545564 B CN109545564 B CN 109545564B
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 124
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 239000011888 foil Substances 0.000 title claims abstract description 111
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 89
- 239000003990 capacitor Substances 0.000 title claims abstract description 34
- 239000007787 solid Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 40
- 229910001512 metal fluoride Inorganic materials 0.000 claims abstract description 35
- 239000002904 solvent Substances 0.000 claims abstract description 33
- 239000000853 adhesive Substances 0.000 claims abstract description 32
- 230000001070 adhesive effect Effects 0.000 claims abstract description 32
- 239000002270 dispersing agent Substances 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 16
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 150000001875 compounds Chemical class 0.000 claims abstract description 7
- 239000011229 interlayer Substances 0.000 claims abstract description 3
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 16
- 239000011698 potassium fluoride Substances 0.000 claims description 12
- 235000003270 potassium fluoride Nutrition 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 10
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 5
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000007788 roughening Methods 0.000 claims description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical group C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 2
- 238000007774 anilox coating Methods 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 238000007581 slurry coating method Methods 0.000 claims 1
- 239000004020 conductor Substances 0.000 abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000006185 dispersion Substances 0.000 description 8
- 238000004945 emulsification Methods 0.000 description 7
- 241001089723 Metaphycus omega Species 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000009830 intercalation Methods 0.000 description 3
- 230000002687 intercalation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000010998 test method Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Conductive Materials (AREA)
Abstract
The invention discloses a carbon-coated aluminum foil for a solid aluminum capacitor and a preparation method thereof. The carbon-coated aluminum foil is prepared by coating an aluminum foil serving as a negative electrode foil and a metal fluoride graphite interlayer compound serving as a conductive carbon material on the surface of the aluminum foil. The carbon-coated aluminum foil is prepared by coating the metal fluoride GICs serving as conductive carbon materials on the surface of the aluminum foil, and the special conductive carbon materials are adopted, so that the carbon-coated aluminum foil can obviously reduce the contact resistance between the high-molecular conductive materials and the aluminum foil. In the preparation process of the carbon-coated aluminum foil, the metal fluoride GIC, the adhesive, the dispersant and the solvent are uniformly mixed in a certain proportion and in an adding sequence to obtain uniformly dispersed conductive carbon slurry, and after the conductive carbon slurry is uniformly coated on the surface of the aluminum foil according to a certain thickness, the contact resistance between a high molecular conductive material and the aluminum foil can be reduced.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a carbon-coated aluminum foil for a solid aluminum capacitor and a preparation method thereof.
Background
The traditional aluminum electrolytic capacitor takes electrolyte as a cathode material, and due to the inherent physical characteristics of the traditional aluminum electrolytic capacitor, the electrolyte is heated, volatilized and expanded to cause the risk of leakage and even explosion. The solid aluminum capacitor uses the polymer conductive material to replace electrolyte, avoids the phenomenon of liquid leakage, has high frequency and low impedance, has little ESR and capacity characteristic change of the capacitor under high and low temperature, and is beneficial to the miniaturization and the chip type of the capacitor.
The solid aluminum capacitor requires excellent conductivity and a smaller contact resistance with the polymer conductive material, as is required. The contact impedance of the traditional corrosion aluminum foil is increased due to the characteristics of surface oxidation and easy corrosion, and the carbon-coated aluminum foil coats the conductive carbon material on the surface of the aluminum foil, so that the contact resistance between the polymer conductive material and the aluminum foil is greatly reduced, and the corrosion and oxidation of the surface of the aluminum foil are prevented.
At present, there are various conductive carbon materials coated on the surface of the aluminum foil, such as graphene, Carbon Nanotube (CNT), Super P and other conductive materials, and there are also various conductive materials blended to be used as a conductive carbon material coated on the surface of the aluminum foil, but at present, there is no report that a metal fluoride Graphite Intercalation Compound (GICs) is used as a conductive carbon material to prepare a carbon-coated aluminum foil.
Disclosure of Invention
The invention aims to provide a carbon-coated aluminum foil for a solid aluminum capacitor. The carbon-coated aluminum foil is prepared by coating a metal fluoride graphite intercalation compound (metal fluoride GICs) serving as a conductive carbon material on the surface of the aluminum foil, and the special conductive carbon material is adopted, so that the carbon-coated aluminum foil can obviously reduce the contact resistance between a high-molecular conductive material and the aluminum foil.
The invention also aims to provide a preparation method of the carbon-coated aluminum foil for the solid aluminum capacitor.
The above object of the present invention is achieved by the following scheme:
a carbon-coated aluminum foil for a solid aluminum capacitor is prepared by coating an aluminum foil serving as a negative electrode foil and a metal fluoride graphite interlayer compound serving as a conductive carbon material on the surface of the aluminum foil.
The invention also provides a preparation method of the carbon-coated aluminum foil for the solid aluminum capacitor, which comprises the following steps:
s1, cleaning the aluminum foil and roughening the aluminum foil;
s2, preparing conductive carbon slurry: mixing and completely dissolving the adhesive, the dispersing agent and the solvent, then adding the metal fluoride GICs step by step, and fully mixing;
s3, uniformly coating the surface of the aluminum foil in the step S1 with the conductive carbon paste in the step S2;
and S4, sintering the aluminum foil coated with the conductive carbon slurry in the step S3 in an inert gas atmosphere to obtain the carbon-coated aluminum foil.
The invention takes the metal fluoride graphite intercalation compound as the conductive carbon material, and the conductive carbon material is uniformly mixed with the adhesive, the dispersant and the solvent according to a certain proportion and adding sequence, so as to obtain uniformly dispersed conductive carbon slurry, and after the conductive carbon slurry is uniformly coated on the surface of the aluminum foil according to a certain thickness, the contact resistance between the high molecular conductive material and the aluminum foil can be reduced.
In the process of preparing the conductive carbon slurry, the addition sequence of the components can influence the dispersibility of the metal fluoride GICs, and the adhesive and the dispersing agent are completely dissolved in the solvent, then the metal fluoride GICs are gradually added, and the mixture is fully stirred until the metal fluoride GICs are highly dispersed in the solvent, otherwise, the slurry is easy to agglomerate and delaminate.
Since metal fluoride GICs can be produced as long as they can be produced as metal fluorides, the metal fluoride GICs in the present invention may be most of metal fluoride GICs, and preferably magnesium fluoride GICs, potassium fluoride GICs, lithium fluoride GICs, or the like.
Preferably, the cleaning and roughening treatment of the aluminum foil in step S1 is performed by an alkali washing or acid washing method.
Further preferably, the alkali washing or acid washing process is as follows: and (3) putting the aluminum foil into 0.1-0.5 mol/L sodium hydroxide or phosphoric acid solution for cleaning for 10-50 s, wherein the cleaning temperature is 40-60 ℃.
The aluminum foil is cleaned and roughened to remove natural oxides on the surface of the aluminum foil, form a rough surface and increase the adhesive force between the aluminum foil and the conductive carbon slurry.
Preferably, the dispersant in step S2 is a modified polyurethane-based polymeric compound; the adhesive is acrylonitrile resin; the solvent is DMF or DMSO.
Preferably, the conductive carbon slurry comprises the following components in percentage by mass: 0.5-8% of metal fluoride GICs, 1-10% of adhesive, 0.05-1.0% of dispersant and the balance of solvent.
Preferably, the conductive carbon slurry comprises the following components in percentage by mass: 1.0-5.0% of metal fluoride GICs, 2-8% of adhesive, 0.1-0.5% of dispersant and the balance of solvent.
Preferably, the conductive carbon slurry mixing process adopts ultrasonic emulsification and dispersion equipment to improve the dispersibility and stability of the conductive carbon slurry and reduce the agglomeration and deposition of the metal fluoride GICs in the slurry.
Preferably, the coating in step S3 is applied in a micro-gravure or anilox roll manner.
Preferably, the thickness of the conductive carbon paste coating in step S3 is 0.5-3.0 μm.
Preferably, the thickness of the conductive carbon paste coating in step S3 is 0.8-2.0 μm.
Preferably, the inert gas in step S4 is nitrogen or argon; the sintering process comprises the following steps: and (3) discharging the rubber for 1-5 h at the temperature of 200-300 ℃, and then heating to 450-600 ℃ for sintering for 6-15 h.
Preferably, the sintering process in step S4 is: discharging the glue for 4h at the temperature of 240-290 ℃, and then heating to 480-550 ℃ for sintering for 12 h.
Compared with the prior art, the invention has the following beneficial effects:
the carbon-coated aluminum foil is prepared by coating the metal fluoride GICs serving as conductive carbon materials on the surface of the aluminum foil, and the special conductive carbon materials are adopted, so that the carbon-coated aluminum foil can obviously reduce the contact resistance between the high-molecular conductive materials and the aluminum foil.
In the preparation process of the carbon-coated aluminum foil, the metal fluoride GIC, the adhesive, the dispersant and the solvent are uniformly mixed in a certain proportion and in an adding sequence to obtain uniformly dispersed conductive carbon slurry, and after the conductive carbon slurry is uniformly coated on the surface of the aluminum foil according to a certain thickness, the contact resistance between a high molecular conductive material and the aluminum foil can be reduced.
Detailed Description
The present invention is further described in detail below with reference to specific examples, which are provided for illustration only and are not intended to limit the scope of the present invention. The test methods used in the following examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are, unless otherwise specified, commercially available reagents and materials.
The following examples were conducted to prepare carbon-coated aluminum foils as represented by magnesium fluoride GICs, potassium fluoride GICs, and lithium fluoride GICs.
Example 1
A carbon-coated aluminum foil for a solid aluminum capacitor is specifically prepared by the following steps:
the used aluminum foil is a 30-micron hard smooth foil, and Al (mass percent) is more than or equal to 99.8 percent.
(1) The aluminum foil is washed in 0.2mol/L sodium hydroxide solution at 50 deg.C for 20 s.
(2) The conductive carbon slurry comprises 1 percent of potassium fluoride GICs, 2 percent of adhesive, 0.1 percent of dispersant and the balance of solvent, and the preparation method comprises the following steps: mixing the adhesive, the dispersant and the solvent, fully stirring until the adhesive, the dispersant and the solvent are completely dissolved, adding the potassium fluoride GICs, and fully mixing in ultrasonic emulsification and dispersion equipment.
(3) And coating the conductive carbon slurry on the surface of the aluminum foil, wherein the thickness of the coating is 1.0 mu m.
(4) And sintering in a bell jar furnace with nitrogen as inert gas at 280 deg.c for 4 hr and at 500 deg.c for 12 hr.
Example 2
A carbon-coated aluminum foil for a solid aluminum capacitor is specifically prepared by the following steps:
the used aluminum foil is a 30-micron hard smooth foil, and Al (mass percent) is more than or equal to 99.8 percent.
(1) The aluminum foil is washed in 0.2mol/L sodium hydroxide solution at 50 deg.C for 20 s.
(2) The conductive carbon slurry comprises 1 percent of magnesium fluoride GICs, 2 percent of adhesive, 0.1 percent of dispersant and the balance of solvent, and the preparation method comprises the following steps: mixing the adhesive, the dispersant and the solvent, fully stirring until the adhesive, the dispersant and the solvent are completely dissolved, adding the magnesium fluoride GICs, and fully mixing in ultrasonic emulsification and dispersion equipment.
(3) And coating the conductive carbon slurry on the surface of the aluminum foil, wherein the thickness of the coating is 1.0 mu m.
(4) And sintering in a bell jar furnace with nitrogen as inert gas at 280 deg.c for 4 hr and at 500 deg.c for 12 hr.
Example 3
A carbon-coated aluminum foil for a solid aluminum capacitor is specifically prepared by the following steps:
the used aluminum foil is a 30-micron hard smooth foil, and Al (mass percent) is more than or equal to 99.8 percent.
(1) The aluminum foil is washed in 0.2mol/L sodium hydroxide solution at 50 deg.C for 20 s.
(2) The conductive carbon slurry consists of 2 percent of potassium fluoride GICs, 2.5 percent of adhesive, 0.2 percent of dispersant and the balance of solvent, and the preparation method comprises the following steps: firstly, mixing the adhesive, the dispersant and the solvent, fully stirring until the adhesive, the dispersant and the solvent are completely dissolved, then adding the metal fluoride GICs, and fully mixing in ultrasonic emulsification and dispersion equipment.
(3) The conductive carbon slurry was coated on the surface of the aluminum foil to a thickness of 1.5 μm.
(4) And sintering in a bell jar furnace with nitrogen as inert gas at 300 deg.c for 4 hr and at 550 deg.c for 12 hr.
Example 4
The method for preparing the carbon-coated aluminum foil of this embodiment is the same as that of embodiment 1, except that the conductive carbon paste in step (2) comprises 5% of lithium fluoride GICs, 6.5% of a binder, 0.5% of a dispersant, and the balance of a solvent.
Example 5
The method for preparing the carbon-coated aluminum foil of this embodiment is the same as that of embodiment 1, except that the conductive carbon slurry in step (2) comprises 7% of potassium fluoride GICs, 9% of a binder, 0.8% of a dispersant, and the balance of a solvent.
Comparative example 1
A carbon-coated aluminum foil is prepared by the following specific steps:
the used aluminum foil is a 30-micron hard smooth foil, and Al (mass percent) is more than or equal to 99.8 percent.
(1) The aluminum foil is washed in 0.2mol/L sodium hydroxide solution at 50 deg.C for 20 s.
(2) The conductive carbon slurry comprises 1% of conductive graphite (KS-6), 2% of adhesive, 0.2% of dispersant and the balance of solvent, and the preparation method comprises the following steps: mixing the adhesive, the dispersant and the solvent, fully stirring until the adhesive, the dispersant and the solvent are completely dissolved, adding the conductive graphite (KS-6), and fully mixing in ultrasonic emulsification and dispersion equipment.
(3) And coating the conductive carbon slurry on the surface of the aluminum foil, wherein the thickness of the coating is 1.0 mu m.
(4) And sintering in a bell jar furnace with nitrogen as inert gas at 280 deg.c for 4 hr and at 550 deg.c for 12 hr.
Comparative example 2
A carbon-coated aluminum foil is prepared by the following specific steps:
the used aluminum foil is a 30-micron hard smooth foil, and Al (mass percent) is more than or equal to 99.8 percent.
(1) The aluminum foil is washed in 0.2mol/L sodium hydroxide solution at 50 deg.C for 20 s.
(2) The conductive carbon slurry consists of 1% of potassium fluoride GICs, 2% of an adhesive, 0.1% of a dispersant and the balance of a solvent, wherein the adding sequence of the components is as follows: firstly, mixing and dispersing the solvent and the metal fluoride GICs, then adding the adhesive and the dispersing agent, and fully mixing in ultrasonic emulsification and dispersion equipment.
(3) And coating the conductive carbon slurry on the surface of the aluminum foil, wherein the thickness of the coating is 1.0 mu m.
(4) And sintering in a bell jar furnace with nitrogen as inert gas at 280 deg.c for 4 hr and at 500 deg.c for 12 hr.
Compared with the embodiment 1, the comparative example changes the adding sequence of the components of the conductive carbon slurry, and because the metal fluoride GICs are dispersed in the solvent in the form of fine solid particles, the metal fluoride GICs are added firstly and then the adhesive is added, so that the dissolution of the adhesive and the dispersion of the metal fluoride GICs are not facilitated, the prepared conductive carbon slurry has the phenomenon of fine particle agglomeration, the problem of uneven coating thickness is generated in the coating process, and the qualified carbon-coated aluminum foil cannot be prepared.
Comparative example 3
A carbon-coated aluminum foil is prepared by the following specific steps:
the used aluminum foil is a 30-micron hard smooth foil, and Al (mass percent) is more than or equal to 99.8 percent.
(1) The aluminum foil is washed in 0.2mol/L sodium hydroxide solution at 50 deg.C for 20 s.
(2) The conductive carbon slurry consists of 9.0 percent of potassium fluoride GICs, 10.0 percent of adhesive, 0.2 percent of dispersant and the balance of solvent, and the preparation method comprises the following steps: mixing the adhesive, the dispersant and the solvent, fully stirring until the adhesive, the dispersant and the solvent are completely dissolved, adding the potassium fluoride GICs, and fully mixing in ultrasonic emulsification and dispersion equipment.
(3) And coating the conductive carbon slurry on the surface of the aluminum foil, wherein the thickness of the coating is 2.0 mu m.
(4) And sintering in a bell jar furnace with nitrogen as inert gas at 300 deg.c for 4 hr and at 550 deg.c for 12 hr.
The content of potassium fluoride GICs added is more and is 9.0 percent of the mass of the conductive carbon slurry, so that the potassium fluoride GICs are difficult to disperse in the preparation process of the conductive carbon slurry, the viscosity of the slurry is high, the leveling property of the slurry during coating is poor, obvious scratches and uneven coating thickness occur, the surface of the sintered coating is rough, carbon powder is removed, and the qualified carbon-coated aluminum foil cannot be prepared.
Testing the conductivity of carbon-coated aluminum foil
The carbon-coated aluminum foil samples of examples 1, 2, 3, 4, and 5 and comparative example 1 were each used to fabricate a solid capacitor having a specification of 25V and 150. mu.F, and the ESR values of the solid capacitors were measured to be 9.43 m.OMEGA., 9.56 m.OMEGA., 9.14 m.OMEGA., 9.08 m.OMEGA., 9.24 m.OMEGA., and 11.83 m.OMEGA. As can be seen from the comparison of the above test results, the ESR values of the solid capacitors produced by the samples of examples 1 and 2 are close to each other, the ESR values of the solid capacitors produced by the samples of examples 3, 4 and 5 are slightly lower than those of the samples of examples 1 and 2, the ESR value of the solid capacitor produced by the sample of comparative example 1 is significantly higher than those of the samples of examples 1, 2, 3, 4 and 5, and there is no significant difference in ESR values of the solid capacitors produced by the samples of examples 3, 4 and 5, and it is found that when the solid content of the metal fluoride GICs exceeds 2%, the ESR value of the solid capacitor is not significantly reduced, and the solid content of the metal fluoride GICs is optimally controlled to be around 2%, so that the coating cost. The ESR value of the solid capacitor and the electric conductivity of the carbon-coated aluminum foil are in a negative correlation relationship, the higher the electric conductivity of the carbon-coated aluminum foil is, the lower the contact resistance between the polymer electric conduction material and the carbon-coated aluminum foil is, and the lower the ESR value of the solid capacitor is, so that the electric conductivity of the carbon-coated aluminum foil prepared by taking the metal fluoride GICs as the electric conduction carbon material is superior to that of the carbon-coated aluminum foil prepared by using the electric conduction graphite, and the metal fluoride GICs is beneficial to reducing the ESR value of the.
It should be finally noted that the above examples are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and that other variations and modifications based on the above description and thought may be made by those skilled in the art, and that all embodiments need not be exhaustive. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A carbon-coated aluminum foil for a solid aluminum capacitor is characterized in that the carbon-coated aluminum foil is prepared by coating an aluminum foil as a negative electrode foil and a metal fluoride graphite interlayer compound as a conductive carbon material on the surface of the aluminum foil;
the carbon-coated aluminum foil for the solid aluminum capacitor is prepared by the following steps:
s1, cleaning an aluminum foil and roughening the aluminum foil;
s2, preparing conductive carbon slurry: mixing and completely dissolving the adhesive, the dispersing agent and the solvent, then adding the metal fluoride GICs step by step, and fully mixing;
s3, uniformly coating the surface of the aluminum foil in the step S1 with the conductive carbon slurry in the step S2;
s4, placing the aluminum foil coated with the conductive carbon slurry in the step S3 in an inert gas atmosphere for sintering, and thus obtaining the carbon-coated aluminum foil;
the conductive carbon slurry comprises the following components in percentage by mass: 0.5-8% of metal fluoride GICs, 1-10% of adhesive, 0.05-1.0% of dispersant and the balance of solvent;
in the step S3, the thickness of the conductive carbon slurry coating is 0.5-3.0 μm; coating is carried out in a micro-gravure or anilox roller mode;
the dispersant is a modified polyurethane high polymer compound; the adhesive is acrylonitrile resin; the solvent is DMF or DMSO.
2. The carbon-coated aluminum foil for solid aluminum capacitors as claimed in claim 1, wherein the metal fluoride GICs in step S2 are magnesium fluoride GICs, potassium fluoride GICs or lithium fluoride GICs.
3. The carbon-coated aluminum foil for the solid aluminum capacitor as claimed in claim 1, wherein the conductive carbon slurry comprises the following components in percentage by mass: 1.0-5.0% of metal fluoride GICs, 2-8% of adhesive, 0.1-0.5% of dispersant and the balance of solvent.
4. The carbon-coated aluminum foil for a solid aluminum capacitor as claimed in claim 1, wherein the conductive carbon paste is applied to a thickness of 0.8 to 2.0 μm in step S3.
5. The carbon-coated aluminum foil for solid aluminum capacitors as claimed in claim 1, wherein the inert gas in step S4 is nitrogen or argon; the sintering process comprises the following steps: and (3) discharging the rubber for 1-5 h at the temperature of 200-300 ℃, and then heating to 450-600 ℃ for sintering for 6-15 h.
6. The carbon-coated aluminum foil for solid aluminum capacitors as claimed in claim 5, wherein the sintering in step S4 comprises: discharging the glue for 4h at the temperature of 240-290 ℃, and then heating to 480-550 ℃ for sintering for 12 h.
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| CN201811418740.1A CN109545564B (en) | 2018-11-26 | 2018-11-26 | Carbon-coated aluminum foil for solid aluminum capacitor and preparation method thereof |
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| US6627252B1 (en) * | 2000-05-12 | 2003-09-30 | Maxwell Electronic Components, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| NL1022221C2 (en) * | 2002-12-20 | 2004-06-22 | Te Strake Surface Technology B | Lubrication system of the solid film type suitable for covering a metal, ceramic or polymeric material that is subject to friction. |
| CN101923961B (en) * | 2010-07-27 | 2011-12-14 | 武汉科技大学 | Carbon/aluminum composite cathode foil for solid aluminum electrolytic capacitor and preparation method thereof |
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