CN116246890A - Graphene reinforced aluminum-based supercapacitor current collector and preparation method thereof - Google Patents
Graphene reinforced aluminum-based supercapacitor current collector and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 86
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 52
- 238000000227 grinding Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000002270 dispersing agent Substances 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 8
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- ZPIRTVJRHUMMOI-UHFFFAOYSA-N octoxybenzene Chemical compound CCCCCCCCOC1=CC=CC=C1 ZPIRTVJRHUMMOI-UHFFFAOYSA-N 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000001272 pressureless sintering Methods 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Natural products CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 22
- 239000007772 electrode material Substances 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/68—Current collectors characterised by their material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The invention discloses a graphene reinforced aluminum-based supercapacitor current collector and a preparation method thereof, comprising the following preparation steps: step one, mixing graphite powder and a liquid dispersing agent, and grinding until the particle size of the powder is smaller than 0.01 mu m to obtain a graphene mixture; mixing aluminum powder and a nonionic surfactant according to the mass ratio of 100 (1-3), grinding for 50-80 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 100-1000:1, adding a liquid dispersing agent until the mass ratio of solid to liquid in the mixture is 4 (5-7), and continuously grinding for 50-80 minutes to obtain a secondary mixture; extracting the liquid in the secondary mixture to obtain mixed dry powder; step four, in an inert gas environment, the mixed dry powder is sintered for 2 to 5 hours at 400 to 600 ℃ after being molded to obtain a sintered plate; and fifthly, rolling and cutting the sintered plate to obtain the graphene reinforced aluminum-based supercapacitor current collector. The current collector has high tensile strength and good conductivity, and the prepared super capacitor has long service life.
Description
Technical Field
The invention relates to the technical field of supercapacitors, in particular to a graphene reinforced aluminum-based supercapacitor current collector and a preparation method thereof.
Background
The current collector (polar plate) of the super capacitor is generally made of metal materials such as metal aluminum, and the electrode material is made of porous carbon materials, so that the bonding strength between the metal materials and the electrode material is poor due to the difference of the surface properties of the metal materials and the porous carbon materials, the contact resistance is high, and the super capacitor is corroded by electrolyte and electrochemical reaction in long-term use, so that the electrode material falls off and other defects.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
The invention also aims to provide the graphene reinforced aluminum-based supercapacitor current collector and the preparation method thereof, which are used for preparing the current collector by tightly combining graphene and aluminum through a powder mixing grinding extrusion sintering method, so that the excellent conductivity and corrosion resistance of the graphene are fully exerted, the contact resistance of the current collector and an electrode material is reduced, the corrosion resistance is increased, the cohesiveness of the current collector and the electrode material is enhanced, and the falling-off of the electrode material is effectively prevented.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a graphene-reinforced aluminum-based supercapacitor current collector is provided, comprising aluminum and graphene in a mass ratio of (100-1000): 1.
The invention also provides a preparation method of the graphene reinforced aluminum-based supercapacitor current collector, which comprises the following steps:
step one, mixing graphite powder and a liquid dispersing agent, and grinding until the particle size of the powder is smaller than 0.01 mu m to obtain a graphene mixture;
mixing aluminum powder and a nonionic surfactant according to the mass ratio of 100 (1-3), grinding for 50-80 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 100-1000:1, adding a liquid dispersing agent until the mass ratio of solid to liquid in the mixture is 4 (5-7), and continuously grinding for 50-80 minutes to obtain a secondary mixture;
extracting the liquid in the secondary mixture to obtain mixed dry powder;
step four, in an inert gas environment, carrying out pressureless sintering on the mixed dry powder at 400-600 ℃ for 2-5 hours after mould pressing to obtain a sintered plate;
and fifthly, rolling and cutting the sintered plate to obtain the graphene reinforced aluminum-based supercapacitor current collector.
Preferably, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the liquid dispersing agent is one of ethanol, acetone and isopropanol.
Preferably, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the nonionic surfactant in the second step is at least one of polyvinyl alcohol, alkylphenol ethoxylates and polyethylene glycol octyl phenyl ether.
Preferably, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, in the second step, a liquid dispersing agent is added until the solid-liquid mass ratio of the mixture is 4:6.
Preferably, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, in the second step, the graphene mixture is added while grinding until the mass ratio of the aluminum powder to the graphene is 1000 (3-7).
Preferably, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the grinding time in the second step is 60 minutes.
Preferably, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the particle size of the aluminum powder is 16-30 μm.
In the method for preparing the graphene reinforced aluminum-based supercapacitor current collector, in the fourth step, the sintered plate is rolled by a rolling mill, and the pressure intensity between two rollers of the rolling mill is 500-700 MPa.
The invention also provides a supercapacitor, which comprises the graphene reinforced aluminum-based supercapacitor current collector prepared by the method.
The invention at least comprises the following beneficial effects: the current collector prepared by the method not only fully plays the excellent conductivity and corrosion resistance of the graphene, reduces the contact resistance of the current collector and the electrode material and increases the corrosion resistance, but also enhances the cohesiveness of the current collector and the electrode material, effectively prevents the electrode material from falling off, and prolongs the service life of the supercapacitor.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The experimental methods described in the following embodiments are conventional methods unless otherwise indicated, and the reagents and materials are commercially available.
In one technical scheme, the invention provides a graphene reinforced aluminum-based supercapacitor current collector, which comprises aluminum and graphene in a mass ratio of (100-1000): 1.
In another technical scheme, the invention provides a preparation method of a graphene reinforced aluminum-based supercapacitor current collector, which comprises the following steps:
step one, mixing graphite powder and a liquid dispersing agent, and grinding until the particle size of the powder is smaller than 0.01 mu m to obtain a graphene mixture;
mixing aluminum powder and a nonionic surfactant according to the mass ratio of 100 (1-3), grinding for 50-80 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 100-1000:1, adding a liquid dispersing agent until the mass ratio of solid to liquid in the mixture is 4 (5-7), and continuously grinding for 50-80 minutes to obtain a secondary mixture;
extracting the liquid in the secondary mixture to obtain mixed dry powder;
step four, in an inert gas environment, carrying out pressureless sintering on the mixed dry powder at 400-600 ℃ for 2-5 hours after mould pressing to obtain a sintered plate;
and fifthly, rolling and cutting the sintered plate to obtain the graphene reinforced aluminum-based supercapacitor current collector.
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the liquid dispersing agent is one of ethanol, acetone and isopropanol.
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the nonionic surfactant in the second step is at least one of polyvinyl alcohol, alkylphenol ethoxylates and polyethylene glycol octyl phenyl ether.
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, in the second step, a liquid dispersing agent is added until the solid-liquid mass ratio of the mixture is 4:6.
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, in the second step, a graphene mixture is added while grinding until the mass ratio of aluminum powder to graphene is 1000 (3-7).
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the grinding time in the second step is 60 minutes.
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, the particle size of the aluminum powder is 16-30 mu m.
In another technical scheme, in the preparation method of the graphene reinforced aluminum-based supercapacitor current collector, in the fourth step, the sintered plate is rolled by a rolling mill, and the pressure intensity between two rollers of the rolling mill is 500-700 MPa.
In another technical scheme, the invention also provides a supercapacitor, which comprises the graphene reinforced aluminum-based supercapacitor current collector prepared by the method.
The preparation method of the graphene reinforced aluminum-based supercapacitor current collector provided by the invention provides the following examples:
example 1
Step one, mixing graphite powder and acetone until the solid-liquid mass ratio is 4:5, and grinding until the particle size of the powder is 0.009 mu m to obtain a graphene mixture;
mixing aluminum powder with the powder particle size of 16 mu m with a mixed solution of polyvinyl alcohol and alkylphenol polyoxyethylene ether at a mass ratio of 100:1, grinding for 50 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 1000:3, adding acetone into the mixture until the mass ratio of solid to liquid is 4:7, and continuously grinding for 50 minutes to obtain a secondary mixture;
extracting liquid in the secondary mixture, and obtaining mixed dry powder in a vacuum environment;
step four, in an inert gas environment, carrying out compression molding on the mixed dry powder to form a plate, and sintering the plate at 400 ℃ for 5 hours to obtain a sintered plate;
and fifthly, repeatedly rolling the sintered plate into a plate with the thickness of 15 mu m through a rolling mill with the pressure of 500MPa between two rollers, and cutting the plate into plates with different widths according to the requirements of different supercapacitors to obtain the graphene reinforced aluminum-based supercapacitor current collector.
Example 2
Step one, mixing graphite powder and ethanol until the solid-liquid mass ratio is 4:6, and grinding until the particle size of the powder is 0.005 mu m, so as to obtain a graphene mixture;
mixing aluminum powder with the powder particle size of 23 mu m and alkylphenol ethoxylate at the mass ratio of 100:2, grinding for 60 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 1000:5, adding ethanol until the mass ratio of solid to liquid in the mixture is 4:6, and continuously grinding for 60 minutes to obtain a secondary mixture;
extracting liquid in the secondary mixture, and obtaining mixed dry powder in an inert gas environment;
step four, in an inert gas environment, carrying out compression molding on the mixed dry powder to form a plate, and sintering the plate at 500 ℃ for 4 hours to obtain a sintered plate;
and fifthly, repeatedly rolling the sintered plate into a plate with the thickness of 20 mu m through a rolling mill with the pressure of 600MPa between two rollers, and cutting the plate into plates with different widths according to the requirements of different supercapacitors to obtain the graphene reinforced aluminum-based supercapacitor current collector.
Example 3
Step one, mixing graphite powder and isopropyl alcohol until the solid-liquid mass ratio is 4:7, and grinding until the particle size of the powder is 0.003 mu m, so as to obtain a graphene mixture;
mixing aluminum powder with the powder particle size of 30 mu m with a mixed solution of polyvinyl alcohol, alkylphenol ethoxylate and polyethylene glycol octyl phenyl ether in a mass ratio of 100:3, grinding for 80 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 1000:7, adding isopropyl alcohol until the mass ratio of solid to liquid in the mixture is 4:5, and continuously grinding for 80 minutes to obtain a secondary mixture;
extracting liquid in the secondary mixture, and obtaining mixed dry powder in a vacuum environment;
step four, in an inert gas environment, carrying out compression molding on the mixed dry powder to form a plate, and sintering the plate at 600 ℃ for 2 hours to obtain a sintered plate;
and fifthly, repeatedly rolling the sintered plate into a plate with the thickness of 30 mu m through a rolling mill with the pressure of 700MPa between two rollers, and cutting the plate into plates with different widths according to the requirements of different supercapacitors to obtain the graphene reinforced aluminum-based supercapacitor current collector.
Comparative example 1
Repeatedly rolling the aluminum material into a plate with the thickness of 20 mu m by a rolling mill with the pressure of 600MPa between two rollers, and then cutting the plate into plates with different widths according to the requirements of different super capacitors to obtain the aluminum material current collector.
Comparative example 2
The difference from example 2 is that: step one, mixing graphite powder and ethanol until the solid-liquid mass ratio is 4:6, and grinding until the particle size of the powder is 0.01 mu m, thus obtaining a graphene mixture.
Comparative example 3
The difference from example 2 is that: grinding the aluminum powder with the powder particle size of 23 mu m for 60 minutes, adding the graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 1000:5, adding ethanol until the mass ratio of solid to liquid in the mixture is 4:6, and continuously grinding for 60 minutes to obtain a secondary mixture.
Comparative example 4
The difference from example 2 is that: mixing aluminum powder with the powder particle size of 23 mu m and alkylphenol ethoxylate at the mass ratio of 100:3, grinding for 60 minutes, adding the graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 1000:5, adding ethanol until the mass ratio of solid to liquid in the mixture is 4:6, and continuously grinding for 60 minutes to obtain a secondary mixture.
Comparative example 5
The difference from example 2 is that: in the second step, adding a liquid dispersing agent until the solid-liquid mass ratio of the mixture is 4:8.
Comparative example 6
The difference from example 2 is that: in the second step, adding a liquid dispersing agent to the mixture, wherein the solid-liquid mass ratio is 1:1.
Comparative example 7
The difference from example 2 is that: in the second step, the graphene mixture is added while grinding until the mass ratio of the aluminum powder to the graphene is 1000:12.
Comparative example 8
The difference from example 2 is that: in the second step, the graphene mixture is added while grinding until the mass ratio of the aluminum powder to the graphene is 10000:5.
The supercapacitor current collector samples prepared in each example and comparative example were subjected to tensile property test at room temperature by using an AG-X100kN electronic universal material tester at a tensile rate of 0.5mm/min, and the resistivity was tested by using a D41-11D/ZM dual-electrical four-probe tester, and when the test current was displayed as a probe coefficient, a button of the resistivity ρ was pressed, and the resistivity ρ value was directly displayed on a screen, and the test results are shown in Table 1.
TABLE 1
| Tensile strength (Mpa) | Resistivity (Ω. M) | |
| Example 1 | 281 | 0.16 |
| Example 2 | 300 | 0.09 |
| Example 3 | 293 | 0.12 |
| Comparative example 1 | 205 | 0.28 |
| Comparative example 2 | 201 | 0.25 |
| Comparative example 3 | 192 | 0.26 |
| Comparative example 4 | 206 | 0.09 |
| Comparative example 5 | 300 | 0.09 |
| Comparative example 6 | 204 | 0.23 |
| Comparative example 7 | 173 | 0.10 |
| Comparative example 8 | 185 | 0.28 |
As can be seen from the test results in table 1, the tensile strength of the graphene reinforced aluminum-based supercapacitor current collector prepared by the method of the present invention is obviously improved and the resistivity is obviously reduced compared with that of the current collector made of the common aluminum foil in comparative example 1, example 2, example 3 and comparative example 1; the size of the graphene powder, the addition amount of the graphene, the amount of the nonionic surfactant and the amount of the liquid dispersing agent in the preparation method are respectively changed, so that the technical effects of obviously improving the tensile strength and obviously reducing the resistivity of the current collector can not be achieved, and the same technical effects as the method can be achieved by adding more liquid dispersing agent in comparative example 5, but resources can be wasted by adding more liquid dispersing agent.
The supercapacitors were fabricated using the current collectors prepared in example 1, example 2, example 3 and comparative example 1, and the supercapacitors were used in the same manner, so that the supercapacitors fabricated using the graphene-reinforced aluminum-based supercapacitor current collectors in example 1, example 2 and example 3 had significantly longer service lives than the supercapacitors fabricated using the aluminum current collectors in comparative example 1.
The number of equipment and the scale of processing described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be readily apparent to those skilled in the art.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (10)
1. The graphene reinforced aluminum-based supercapacitor current collector is characterized by comprising aluminum and graphene in a mass ratio of (100-1000): 1.
2. The preparation method of the graphene reinforced aluminum-based supercapacitor current collector is characterized by comprising the following steps of:
step one, mixing graphite powder and a liquid dispersing agent, and grinding until the particle size of the powder is smaller than 0.01 mu m to obtain a graphene mixture;
mixing aluminum powder and a nonionic surfactant according to the mass ratio of 100 (1-3), grinding for 50-80 minutes, adding a graphene mixture while grinding until the mass ratio of the aluminum powder to the graphene is 100-1000:1, adding a liquid dispersing agent until the mass ratio of solid to liquid in the mixture is 4 (5-7), and continuously grinding for 50-80 minutes to obtain a secondary mixture;
extracting the liquid in the secondary mixture to obtain mixed dry powder;
step four, in an inert gas environment, carrying out pressureless sintering on the mixed dry powder at 400-600 ℃ for 2-5 hours after mould pressing to obtain a sintered plate;
and fifthly, rolling and cutting the sintered plate to obtain the graphene reinforced aluminum-based supercapacitor current collector.
3. The method for preparing the graphene reinforced aluminum-based supercapacitor current collector according to claim 2, wherein the liquid dispersing agent is one of ethanol, acetone and isopropyl alcohol.
4. The method for preparing the graphene reinforced aluminum-based supercapacitor current collector according to claim 2, wherein the nonionic surfactant in the second step is at least one of polyvinyl alcohol, alkylphenol ethoxylates and polyethylene glycol octyl phenyl ether.
5. The method for preparing the graphene reinforced aluminum-based supercapacitor current collector according to claim 2, wherein in the second step, a liquid dispersing agent is added until the solid-liquid mass ratio of the mixture is 4:6.
6. The preparation method of the graphene reinforced aluminum-based supercapacitor current collector as claimed in claim 2, wherein in the second step, the graphene mixture is added while grinding until the mass ratio of aluminum powder to graphene is 1000 (3-7).
7. The method for preparing the graphene reinforced aluminum-based supercapacitor current collector according to claim 2, wherein the grinding time in the second step is 60 minutes.
8. The method for preparing the graphene reinforced aluminum-based supercapacitor current collector according to claim 2, wherein the particle size of the aluminum powder is 16-30 μm.
9. The method for preparing the graphene reinforced aluminum-based supercapacitor current collector according to claim 2, wherein in the fourth step, the sintered plate is rolled by a rolling mill, and the pressure between two rollers of the rolling mill is 500-700 Mpa.
10. Supercapacitor, characterized in that it comprises a graphene-reinforced aluminium-based supercapacitor current collector according to any one of claims 1 to 9.
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