Manufacturing method for three-dimensional graphene electrode and supercapacitor

Abstract

A manufacturing method for a three-dimensional graphene electrode and a supercapacitor. The manufacturing method comprises the following steps: S1, uniformly mixing an adhesive, a dispersant and ultrapure water according to a ratio of 3:1.5:200, so as to prepare a base solution; S2, preparing a three-dimensional graphene solid, and stirring and mixing the base solution with the three-dimensional graphene solid according to a ratio of 5:4.7 until the mixture is in a dough shape; S3, adding the base solution in the same amount as that of the base solution in S2 thereto again, and stirring the mixture until same is pasty, so as to obtain a slurry; S4, preparing an aluminum foil plate, and respectively coating both faces of the aluminum foil plate with the slurry by means of a coating machine, so as to prepare an electrode plate; S5, drying the slurry on the electrode plate; S6, cutting the electrode plate into a plurality of electrodes; and S7, finally, placing the plurality of electrodes into an electrolyte for electrolysis, thereby forming positive and negative electrodes at both ends of the electrode. By coating the aluminum foil plate with a slurry comprising three-dimensional graphene to prepare the electrode, since the graphene itself has an extremely high conductivity, no conductive agent is required to be added, such that the internal resistance of a supercapacitor is lower, and super-power charging and discharging can be easily achieved.

Description

A three-dimensional graphene electrode manufacturing method and supercapacitor Technical Field

[0001] The present invention relates to the field of electrode technology, and in particular to a method for manufacturing a three-dimensional graphene electrode and a supercapacitor. Background Art

[0002] Supercapacitors are new energy storage devices that utilize the double-layer principle to store energy, offering advantages such as high specific power, long life, and a wide temperature range. Currently, the active material for supercapacitors primarily uses high-surface-area activated carbon, which offers a high cost-effectiveness. However, activated carbon has poor electrical conductivity, low space utilization, and a high concentration of impurities that can affect electrochemical stability, significantly limiting the performance and development of supercapacitors. Technical issues

[0003] In view of the above situation, it is necessary to provide a three-dimensional graphene electrode manufacturing method and a supercapacitor to solve the problem that the active materials of existing supercapacitors have great limitations. Technical Solutions

[0004] To achieve the above objectives, in a first aspect, the present invention provides a method for manufacturing a three-dimensional graphene electrode, comprising the following steps:

[0005] S1: Mix the adhesive, dispersant and ultrapure water in a ratio of 3:1.5:200 to prepare a base solution;

[0006] S2: Prepare three-dimensional graphene solid by mixing the base liquid and the three-dimensional graphene solid in a ratio of 5:4.7 until a dough is formed;

[0007] S3: Add the same amount of base liquid as S2 again and stir until it becomes a slurry to obtain a slurry;

[0008] S4: Prepare an aluminum foil plate, and apply the slurry to both sides of the aluminum foil plate using a coating machine to form an electrode plate;

[0009] S5: drying the slurry on the electrode plate;

[0010] S6: cutting the electrode plate into several electrodes;

[0011] S7: Finally, place several electrodes into the electrolyte for electrolysis to form positive and negative poles at both ends of the electrodes.

[0012] Furthermore, in S3, the obtained slurry is filtered through a sieve.

[0013] Furthermore, in S4, after the slurry is coated on the aluminum foil plate, the slurry is rolled and flattened by a roller press.

[0014] Furthermore, in S4, before the coating operation, the surface of the aluminum foil plate is purified.

[0015] Furthermore, in S1, the base liquid is placed in a disperser for uniform mixing.

[0016] Furthermore, in S2 and S3, a stirrer is used to stir and mix the three-dimensional graphene solid and the base liquid.

[0017] Furthermore, in S2, the three-dimensional graphene solid is three-dimensional graphene powder with a pore size of 0.5-2 nm.

[0018] Furthermore, in S4, the thickness of the electrode plate is 100 nm-300 nm.

[0019] Furthermore, in S2 and S3, heating is performed during the stirring process.

[0020] In a second aspect, the present invention provides a supercapacitor comprising: a shell and a winding core disposed in the shell, wherein the winding core is provided with an electrode, and the electrode is manufactured by any one of the three-dimensional graphene electrode manufacturing methods in the first aspect. Beneficial effects

[0021] Through the above technical solution, the beneficial effects of the present invention are:

[0022] The present invention forms electrodes by coating a slurry containing three-dimensional graphene onto an aluminum foil plate. Since graphene itself has extremely high electrical conductivity, no conductive agent needs to be added, resulting in a lower internal resistance of the supercapacitor and easy realization of ultra-high power charging and discharging.

[0023] Graphene has a high spatial utilization rate, so it can make the supercapacitor's capacity larger. At the same time, the three-dimensional graphene structure is highly stable, and the entry and exit of ions during use does not harm the three-dimensional graphene body, making the supercapacitor's cycle performance better.

[0024] Three-dimensional graphene does not contain impurities and has better electrochemical stability, and the supercapacitors prepared have a longer load life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a flow chart of a method according to a first embodiment of the present invention;

[0026] FIG2 is a schematic diagram of the three-dimensional structure of the electrode plate according to the first embodiment of the present invention.

[0027] 100, slurry; 200, aluminum foil plate; 300, electrode plate. Best Mode for Carrying Out the Invention

[0028] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, a method for manufacturing a three-dimensional graphene electrode and a supercapacitor according to the present invention are further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. Example 1

[0029] Referring to Figures 1-2, a method for manufacturing a three-dimensional graphene electrode includes the following steps:

[0030] S1: Mix the binder, dispersant, and ultrapure water in a ratio of 3:1.5:200 to create a base solution. The ultrapure water dilutes the binder, forming a viscous solution. Simultaneously, the conductive medium in the ultrapure water is almost completely removed, and the undissociated colloids, gases, and organic matter in the water are removed to a very low resistivity of 10MΩ*cm, which does not affect the conductivity of the electrode. The addition of a dispersant facilitates the rapid dispersion and dissolution of the three-dimensional graphene solid. Dispersants are surfactants with opposing lipophilic and hydrophilic properties within their molecules. They can evenly disperse some solid particles that are difficult to dissolve in liquids, while also preventing the solid particles from settling and agglomerating, allowing the solution to form a stable suspension.

[0031] S2: Prepare three-dimensional graphene solids, stir and mix the base liquid and the three-dimensional graphene solids in a ratio of 5:4.7 until they become a dough. Due to the effect of the dispersant, the three-dimensional graphene solids can be quickly dispersed into soluble particles, so that the graphene solids are basically dissolved and dispersed in the base liquid;

[0032] S3: Add an equal amount of base liquid as in S2 again and stir until it becomes a slurry to obtain slurry 100. Due to the effect of the adhesive in the base liquid, the slurry 100 has viscosity, which is convenient for subsequent coating on the aluminum foil plate 200. By adding the base liquid in steps, the three-dimensional graphene solid solution can be melted and dispersed more evenly.

[0033] S4: Prepare an aluminum foil plate 200. Use a coating machine to apply the slurry 100 to both sides of the aluminum foil plate 200 to form the electrode plate 300. Since the slurry 100 has adhesive properties, it can adhere to the surface of the aluminum foil plate 200. The thickness of the applied slurry 100 can be adjusted according to specific needs. Preferably, the coating machine can be used to coat both sides simultaneously, which can increase production efficiency.

[0034] S5: Drying the slurry 100 on the electrode plate 300 can solidify the slurry 100 on the surface of the aluminum foil plate 200 .

[0035] S6: Cut the electrode plate into several electrodes for use as electrodes in supercapacitors or other components. The specific cutting dimensions can be set as needed. Preferably, the electrode plate 300 is cut using a cutting machine. After cutting, the motor edges can be trimmed and polished.

[0036] S7: Finally, several electrodes are placed in the electrolyte for electrolysis, and the electrolyte is energized. The positive and negative poles are formed at both ends of the electrodes through the movement of anions and cations.

[0037] In this embodiment, in S3, the obtained slurry 100 is filtered through a sieve to remove undissolved large particles in the slurry 100. Preferably, the sieve is a 200-mesh sieve with a pore size of 74.162 μm, which can effectively filter out incompletely decomposed macromolecular particles.

[0038] In this embodiment, in S4, after the slurry 100 is coated on the aluminum foil plate 200, the slurry 100 is rolled and flattened by a roller press so that the slurry 100 is compacted, which can ensure the density of the three-dimensional graphene and thus the conductive performance, and at the same time make the surface of the electrode plate 300 flat and smooth.

[0039] In this embodiment, in S4, before the coating operation, the surface of the aluminum foil plate 200 is purified, including degreasing, alkali washing and other operations. Degreasing can remove grease on the surface of the aluminum foil plate 200, and alkali washing can remove the oxide layer on the surface of the aluminum foil plate 200.

[0040] In this embodiment, in S1, the base liquid is placed in a disperser for uniform mixing, and the disperser drives the base liquid to rotate so that the adhesive, dispersant and ultrapure water are uniformly mixed.

[0041] In this embodiment, in S2 and S3, a stirrer is used to stir and mix the three-dimensional graphene solid and the base liquid. Under the action of the stirrer, the three-dimensional graphene solid can be fully stirred and dissolved in the base liquid.

[0042] In this embodiment, in S2, the three-dimensional graphene solid uses three-dimensional graphene powder, which is convenient for better fusion with the base liquid and has a pore size of 0.5-2nm, which can match the positive and negative electrode ion sizes in the supercapacitor and better exert the performance of the supercapacitor.

[0043] In this embodiment, in S4, the thickness of the electrode plate is 100 nm-300 nm, which is not limited here and can be selected according to specific needs.

[0044] In this embodiment, in S2 and S3, heating is performed during the stirring process to accelerate the dissolution of the three-dimensional graphene solid. Example 2

[0045] The present invention provides a supercapacitor, comprising: a shell and a winding core arranged in the shell, the winding core being provided with an electrode, and the electrode being manufactured by any one of the three-dimensional graphene electrode manufacturing methods of the first aspect. The present invention forms an electrode by applying a slurry containing three-dimensional graphene to an aluminum foil plate. Since graphene itself has extremely high electrical conductivity, there is no need to add a conductive agent, which makes the internal resistance of the supercapacitor lower and can easily achieve ultra-high power charging and discharging. At the same time, graphene has high space utilization and a large specific surface area, which is 5-20 times that of existing activated carbon material systems, so the capacity of the supercapacitor can be larger. At the same time, the three-dimensional graphene structure is highly stable, and the entry and exit of ions during use does not harm the three-dimensional graphene body, which makes the supercapacitor cycle performance better and the cycle service life can be extended by 2-5 times. In addition, the three-dimensional graphene does not contain impurities and has better electrochemical stability. The prepared supercapacitor has a longer load service life.

[0046] Anything not described in detail in the present invention is well known to those skilled in the art.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A method for manufacturing a three-dimensional graphene electrode, characterized in that: The steps include: S1: Mix the adhesive, dispersant and ultrapure water in a ratio of 3:1.5:200 to prepare a base solution; S2: preparing a three-dimensional graphene solid, stirring and mixing the base liquid and the three-dimensional graphene solid in a ratio of 5:4.7 until a dough is formed; S3: adding the same amount of the base liquid as that of S2 again and stirring until it becomes a slurry to obtain a slurry (100); S4: preparing an aluminum foil plate (200), and applying the slurry (100) to both sides of the aluminum foil plate (200) by a coating machine to form an electrode plate (300); S5: drying the slurry (100) on the electrode plate (300); S6: cutting the electrode plate (300) into a plurality of electrodes; S7: Finally, several of the electrodes are placed in an electrolyte for electrolysis, so that positive and negative electrodes are formed at both ends of the electrodes.

2. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S3, the obtained slurry (100) is filtered through a sieve.

3. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S4, after the slurry (100) is coated on the aluminum foil plate (200), the slurry (100) is rolled and flattened by a roller press.

4. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S4, before the coating operation, the surface of the aluminum foil plate (200) is purified.

5. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S1, the base liquid is placed in a disperser for uniform mixing.

6. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S2 and S3, a stirrer is used to stir and mix the three-dimensional graphene solid and the base liquid.

7. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S2, the three-dimensional graphene solid is three-dimensional graphene powder with a pore size of 0.5-2 nm.

8. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S4, the thickness of the electrode plate (300) is 100 nm-300 nm.

9. The method for manufacturing a three-dimensional graphene electrode according to claim 1, wherein: In S2 and S3, heating is performed during stirring.

10. A supercapacitor, characterized in that: include: A shell and a winding core arranged in the shell, wherein the winding core is provided with an electrode, and the electrode is manufactured by the three-dimensional graphene electrode manufacturing method described in any one of claims 1 to 9.

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