Method for constructing high-performance flexible interdigital supercapacitor and integrated circuit by chlorine / bromine doped graphene nanosheets
Chlorine/bromine doped graphene nanosheets were prepared through one-step graphite electrocorrosion technology, and a flexible interdigital supercapacitor was constructed, which solved the problem of insufficient stability and flexibility of electrode materials in the prior art, and achieved a flexible interdigital integrated circuit with high cycle stability and bending resistance.
Patent Information
- Application Number
- CN202410902322.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-06
- Publication Date
- 2025-03-18
AI Technical Summary
It is difficult to develop electrode materials with strong charge storage capabilities, good flexibility and excellent stability for building flexible interdigital integrated circuits that are resistant to bending, have long cycle life and can flexibly adjust voltage/current.
Chlorine/bromine doped graphene nanosheets were prepared through one-step graphite electrocorrosion technology, the ammonium halide concentration was optimized to adjust the doping ratio of chlorine/bromine, and the graphene was filled with a reduced pressure filtration device to the hollow part of the metal template, transfer the electrode pattern to the polymer transparent film, and packaged it with an aqueous gel as an electrolyte to construct a flexible interdigital supercapacitor.
It realizes a supercapacitor with a continuous cycle of 300,000 turns at 5 A cm-3 and a capacity retention rate of more than 97%. It has excellent cycle stability and bending resistance, and can be bent at any angle. It is suitable for power supply of multiple LED lamps, electronic meters and light strips.
Smart Images
Figure CN119650314A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a method for constructing a high-performance flexible interdigital supercapacitor and an integrated circuit, and in particular to a method for constructing a high-performance flexible interdigital supercapacitor and an integrated circuit using ultra-stable chlorine / bromine-doped graphene nanosheets, belonging to the field of energy storage device preparation. Background Art
[0002] With the rapid development of electronic information and flexible intelligent devices, the requirements for the use of micro flexible electronic devices are getting higher and higher. Traditional sandwich microelectronic devices based on metal wires have shortcomings such as high cost and poor flexibility, while flexible interdigital supercapacitors have the advantages of easy integration, high cycle stability, and high safety, becoming one of the most promising micro energy storage devices. Developing electrode materials with strong charge storage capacity, good flexibility and excellent stability, and realizing the integration of multiple interdigital electrodes on the same flexible film are of great practical significance for constructing flexible interdigital integrated circuits that are resistant to bending, have long cycle life, and can flexibly adjust voltage / current.
[0003] Graphene has a two-dimensional planar structure, a high theoretical specific surface area, and excellent chemical stability. It is the most promising electrode material in the field of flexible micro-supercapacitors. The uniformity and stability of graphene dispersion in aqueous solution are crucial to the yield of flexible interdigital electrodes. Avoiding the stacking and agglomeration of graphene during the service of the electrode is critical to improving the stability and service life of the device. By improving the charge distribution and microstructure of the graphene surface, the uniformity and stability of graphene dispersion in water can be improved, and the agglomeration and stacking of graphene during the charge storage process can be eliminated. Introducing highly electronegative halogen elements into graphene to form CX bonds can break the original six-membered ring structure of graphene to produce a large number of surface pits and defects, generate charge redistribution on the graphene surface, and significantly improve the wettability of graphene in water. The nanosheet structure can improve its uniformity and stability of dispersion in water, which is conducive to the construction of flexible interdigital electrodes with stable performance. Therefore, the preparation of halogen-doped graphene nanosheets by a simple, safe and green method and the construction of flexible interdigitated supercapacitors with good mechanical properties and excellent stability by a simple and controllable technology have important practical significance for the assembly and large-scale application of flexible integrated circuits. Summary of the invention
[0004] The present invention provides a method for constructing a high-performance flexible interdigital supercapacitor and an integrated circuit using chlorine / bromine doped graphene nanosheets. The scheme of the present invention is: a one-step graphite electrocorrosion technique is used to prepare an aqueous solution of chlorine / bromine doped graphene nanosheets, the doping ratio of chlorine / bromine in the graphene nanosheets can be adjusted by optimizing the concentration of ammonium halide, a vacuum filtration device is used to fill the graphene into the hollow part of the metal template, the graphene electrode pattern in the hollow area is transferred to a polymer transparent film, an aqueous gel electrolyte is applied to the electrode pattern, solidified and film-encapsulated, and a flexible interdigital supercapacitor is constructed. The flexible interdigital supercapacitor constructed with aqueous gel as the electrolyte has a high capacitance at 5 A cm -3 It can be continuously cycled for 300,000 times with a capacity retention rate of more than 97%. There is no capacity attenuation problem caused by graphene agglomeration and stacking, and it has excellent cycle stability. The flexible interdigitated supercapacitor can be bent at any angle with a capacity retention rate of more than 97%. Single supercapacitors are combined in series and parallel to prepare integrated circuits, which can realize flexible regulation of output power and power supply for multiple LED lights, electronic watches and light strips.
[0005] As a preferred technical solution, the chlorine / bromine doped graphene nanosheets are highly transparent and stable. The concentration of the chlorine / bromine doped graphene nanosheet aqueous solution is 0.01-2 mg / ml and can be placed for three months without coagulation.
[0006] As a preferred technical solution, the flexible interdigital supercapacitor constructed by the chlorine / bromine doped graphene nanosheets has a high capacitance at 5 A cm -3 After 300,000 continuous cycles, the capacity retention rate is greater than 97%, and the graphene electrode structure still maintains the initial layered structure, without capacity attenuation caused by graphene agglomeration and stacking.
[0007] As a preferred technical solution, the flexible interdigitated supercapacitor constructed with chlorine / bromine-doped graphene nanosheets has a capacity retention rate of more than 97% at any bending angle and has excellent bending resistance and mechanical flexibility.
[0008] As a preferred technical solution, the preparation of the chlorine / bromine doped graphene nanosheet aqueous solution comprises the following steps: 1) In a mixed solution of ammonium chloride and ammonium bromide in dilute sulfuric acid, apply a voltage of 5-15 V in a two-electrode system, with graphite raw material as the working electrode, apply the voltage for 10-15 minutes, and the reaction temperature is room temperature; 2) By exploring and optimizing the concentrations of ammonium chloride and ammonium bromide in dilute sulfuric acid electrolyte, the doping ratio and content of chlorine / bromine in graphene nanosheets can be adjusted. The optimized concentration of ammonium chloride in sulfuric acid solution is 0.01-0.1 mol / L, and the optimized concentration of ammonium bromide in sulfuric acid solution is 0.001-0.01 mol / L. 3) The solution obtained in step 1) is filtered and washed 3-5 times with deionized water under reduced pressure, ultrasonicated at room temperature for 10-40 minutes, allowed to stand for 10-48 hours, and the upper layer solution is taken to obtain a chlorine / bromine-doped graphene nanosheet aqueous solution.
[0009] As a preferred technical solution, the chlorine / bromine doped graphene nanosheet can adjust the ratio and content of chlorine / bromine doping by optimizing and changing the concentration of ammonium chloride and ammonium bromide in the electrolyte, thereby optimizing and improving the specific capacity of graphene.
[0010] As a preferred technical solution, the method of constructing a high-performance flexible interdigital supercapacitor and an integrated circuit using chlorine / bromine-doped graphene nanosheets can control the shape, size, thickness and interdigital spacing of the pattern in the hollow area according to the metal hollow template, and construct an integrated circuit by adjusting the number of series and parallel flexible interdigital supercapacitors to achieve flexible regulation of the output power, which can provide power support for multiple LED lights, electronic watches and light strips.
[0011] Advantages of the present invention: Through one-step graphite electrocorrosion technology, the simultaneous construction of graphene nanosheet structure and chlorine / bromine doping can be achieved in a simple two-electrode system. By optimizing and exploring the concentration of ammonium halide salts, the ratio and content of chlorine / bromine doping can be controlled, and the specific capacity and stability of graphene can be optimized and improved. The entire preparation method is simple and green, without the use of high temperature, high pressure and expensive instruments.
[0012] The highly transparent nanosheet structure and the surface charge changes caused by chlorine / bromine doping increase the wettability of graphene in water, increase the interlayer spacing of graphene and the repulsive force between nanosheets, and make the graphene suspended aqueous solution super stable. At the same time, it overcomes the problem of easy agglomeration and stacking of graphene nanosheets. The constructed flexible interdigitated supercapacitor exhibits super excellent cycle stability and bending resistance.
[0013] Chlorine / bromine doped graphene nanosheets play a triple role as electrode material, conductive agent and binder in flexible interdigitated electrodes, and can easily realize the effective integration of multiple interdigitated electrodes on the same flexible substrate. Due to the high repeatability of the preparation method and the high yield of the interdigitated electrodes, the output power of integrated circuits can be flexibly controlled, and it has broad application prospects in the field of integrated circuits.
[0014] Due to the adoption of the above technical scheme, a method for constructing high-performance flexible interdigital supercapacitors and integrated circuits with chlorine / bromine doped graphene nanosheets is provided. The ultra-stable chlorine / bromine doped graphene nanosheet aqueous solution is prepared by one-step graphite electrocorrosion technology, and the ultra-stable chlorine / bromine doped graphene nanosheet aqueous solution is filtered under reduced pressure to the hollow area of the metal template, and the graphene electrode pattern of the obtained hollow area is transferred to a polymer transparent substrate, and an aqueous gel electrolyte is applied to the electrode pattern to make an integrated circuit with any combination of series and parallel connections. The present invention improves the surface charge distribution and the construction of a highly transparent nanosheet structure by introducing carbon-halogen bonds, significantly enhances the dispersion uniformity and stability of graphene in water, improves the specific capacity and cycle stability of the constructed flexible interdigital supercapacitor, avoids the problem of agglomeration and stacking of graphene during long-term service, and the constructed flexible interdigital supercapacitor has very good mechanical flexibility, and can easily realize the effective integration of multiple interdigital electrodes on a flexible substrate. The entire preparation process is simple and repeatable, and no metal current collector, conductive agent, or polymer adhesive is used. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a scanning electron microscope image of chlorine / bromine doped graphene nanosheets prepared in the present invention on a silicon wafer; Figure 2 A transmission electron microscope image of chlorine / bromine doped graphene nanosheets prepared in the present invention; Figure 3 The X-ray powder diffraction pattern of the chlorine / bromine doped graphene nanosheet prepared by the present invention; Figure 4 X-ray photoelectron spectroscopy data of chlorine / bromine doped graphene nanosheets prepared in the present invention, (a) full spectrum, (b) C 1s , (c)Cl 2p and (d)Br 3d ; Figure 5 The photographs of (a) an undoped graphene nanosheet aqueous solution prepared by the present invention after being placed for one month, and (b) a photograph of a chlorine / bromine doped graphene nanosheet aqueous solution after being placed for three months; Figure 6 (a) Schematic diagram of the size of the metal template prepared in the present invention, and (b) a picture of the prepared flexible interdigital electrode; Figure 7 The present invention is prepared by optimizing and exploring the concentrations of ammonium chloride and ammonium bromide in the sulfuric acid electrolyte used for electrocorrosion of graphite, thereby obtaining different chlorine / bromine doping ratios and contents in graphene; Figure 8The cyclic voltammetry curves (a) of the flexible interdigital supercapacitor constructed with graphene nanosheets with different chlorine / bromine doping ratios and contents prepared by the present invention and polyvinyl alcohol / sulfuric acid (PVA / H2SO4) as the electrolyte, the cyclic voltammetry curves (b) of 0.91 (at.%) chlorine / 1.50 (at.%) bromine doped graphene nanosheets, single doped graphene nanosheets and undoped graphene nanosheets, and the charge and discharge curves under different conditions (c, d); Fig. 9 The capacity retention rate of the flexible interdigital supercapacitor constructed with chlorine / bromine-doped graphene nanosheets prepared by the present invention and using polyvinyl alcohol / sulfuric acid as electrolyte after 300,000 cycles at 5A cm-3; Fig.10 The flexible interdigital supercapacitor constructed with chlorine / bromine doped graphene nanosheets prepared by the present invention and using polyvinyl alcohol / sulfuric acid as electrolyte has a high capacitance at 5A cm -3 Electrode cross-section diagram before (a) and after (b) 300,000 cycles; Fig.11 The bending pictures (a) of the flexible interdigital supercapacitor constructed with chlorine / bromine-doped graphene nanosheets prepared by the present invention and using polyvinyl alcohol / sulfuric acid as electrolyte at different angles, the constant current charge-discharge curves (b) and the capacity retention rate (c) at different angles; Fig.12 The physical display of (a) three interdigitated electrodes in series and parallel integrated with polyvinyl alcohol / sulfuric acid as electrolyte constructed by chlorine / bromine doped graphene nanosheets prepared by the present invention, (b) the change of integrated circuit voltage with the number of series connections, and (c) the change of integrated circuit current with the number of series connections; Fig.13 An integrated circuit (a, b) of a flexible interdigital supercapacitor constructed of chlorine / bromine-doped graphene nanosheets prepared by the present invention assembled in series and parallel, lighting up multiple LED lights (c), and supplying power to an electronic watch in a bent state (df); Fig.14 The flexible supercapacitor and integrated circuit constructed by the chlorine / bromine doped graphene nanosheets prepared by the present invention are used as the power source of the light strip. DETAILED DESCRIPTION
[0015] The present invention provides a method for constructing a high-performance flexible interdigital supercapacitor and an integrated circuit using chlorine / bromine-doped graphene nanosheets, so as to solve the problems in the above-mentioned background technology.
[0016] The scheme of the present invention is: using a one-step graphite electrocorrosion technology to prepare chlorine / bromine doped graphene nanosheets, adjusting the concentration of ammonium halide to adjust the doping ratio and content of chlorine / bromine in the graphene nanosheets, using a vacuum filtration device to fill the graphene into the hollow part of the metal template, transferring the graphene electrode pattern in the hollow area to a polymer transparent film, applying an aqueous gel electrolyte to the electrode pattern, solidifying and film encapsulating, and constructing a flexible interdigital supercapacitor. The flexible supercapacitor constructed with aqueous gel as the electrolyte has a high conductivity at 5 A cm -3 It can be continuously cycled for 300,000 times with a capacity retention rate greater than 97%, almost no capacity loss, and no capacity attenuation caused by graphene agglomeration and stacking. It has excellent cycle stability. The flexible interdigitated supercapacitor can be bent at any angle with almost no capacity loss and a retention rate greater than 97%. Single supercapacitors are combined in series and parallel to prepare integrated circuits, which can power multiple LED lights, electronic watches and light strips.
[0017] As a preferred technical solution, the chlorine / bromine doped graphene nanosheets are highly transparent and stable. The concentration of the chlorine / bromine doped graphene nanosheet aqueous solution is 0.01-2 mg / ml and can be placed for three months without coagulation.
[0018] As a preferred technical solution, the high-performance flexible interdigital supercapacitor has a -3 After 300,000 continuous cycles, the capacity retention rate is greater than 97%, and the graphene electrode structure still maintains the initial layered structure, without capacity attenuation caused by graphene agglomeration and stacking.
[0019] As a preferred technical solution, it is characterized in that the constructed flexible energy storage device has a capacity retention rate of more than 97% at any bending angle and has excellent bending resistance and mechanical flexibility.
[0020] 1) In a mixed solution of ammonium chloride and ammonium bromide in dilute sulfuric acid, apply a voltage of 5-15 V in a two-electrode system, with graphite raw material as the working electrode, apply the voltage for 10-15 minutes, and the reaction temperature is room temperature.
[0021] 2) By exploring and optimizing the concentrations of ammonium chloride and ammonium bromide in dilute sulfuric acid electrolyte, the doping ratio and content of chlorine / bromine in graphene nanosheets can be adjusted. The optimized concentration of ammonium chloride in sulfuric acid solution is 0.01-0.1 mol / L, and the optimized concentration of ammonium bromide in sulfuric acid solution is 0.001-0.01 mol / L.
[0022] 3) The solution obtained in step 1) is filtered and washed 3-5 times with deionized water under reduced pressure, ultrasonicated at room temperature for 10-40 minutes, allowed to stand for 10-48 hours, and the upper layer solution is taken to obtain a chlorine / bromine-doped graphene nanosheet aqueous solution.
[0023] As a preferred technical solution, the chlorine / bromine doped graphene nanosheet is characterized in that the ratio and content of chlorine / bromine doping can be adjusted by optimizing and changing the concentration of ammonium chloride and ammonium bromide in the electrolyte, thereby achieving an optimized improvement in the specific capacity of graphene.
[0024] As a preferred technical solution, the method of constructing a high-performance flexible interdigital supercapacitor and an integrated circuit using chlorine / bromine-doped graphene nanosheets can control the shape, size, thickness and interdigital spacing of the pattern in the hollow area according to the metal hollow template, and construct an integrated circuit by adjusting the number of series and parallel flexible interdigital supercapacitors to achieve flexible regulation of the output power, which can provide power support for multiple LED lights, electronic watches and light strips.
[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments. Example
[0026] 1. Prepare 0.1 mol / L sulfuric acid solution with ammonium chloride concentration of 0.039 mol / L and ammonium bromide concentration of 0.0033 mol / L as electrolyte, graphite sheet as working electrode, platinum sheet as counter electrode, apply 10 V voltage under DC voltage for 10 minutes, and the graphite sheet is completely peeled off; the obtained black dispersion is filtered and washed with deionized water under reduced pressure for 3 times, ultrasonicated at room temperature for 20 min, and allowed to stand for 24 hours. Take the upper solution to obtain the aqueous solution of chlorine / bromine-doped graphene nanosheets dispersion, take a small amount of solution and drop it on the silicon wafer for structural characterization, such as Figure 1 As shown, the obtained graphene nanosheets have good dispersion on the silicon wafer, and the diameter of the nanosheets is about 5 microns. Through transmission electron microscopy characterization, it is found that the obtained graphene nanosheets have the characteristics of high transparency, such as Figure 2 As shown. X-ray powder diffraction characterization found that the characteristic diffraction peaks of chlorine / bromine doped graphene nanosheets were significantly shifted to lower angles compared to pure graphite and undoped graphene nanosheets, indicating that a larger graphene interlayer spacing was obtained after doping with chlorine / bromine, such as Figure 3 As shown. X-ray photoelectron spectroscopy revealed that chlorine and bromine were successfully doped into graphene to form carbon-chlorine bonds and carbon-bromine bonds, as shown Figure 4 shown.
[0027] 2. Compared with the undoped samples, which are prone to coagulation, the chlorine / bromine doped graphene nanosheets aqueous solution remained in its original state after being placed for three months without any coagulation or separation. Figure 5 shown.
[0028] 3. Prepare metal hollow mask templates of different shapes and sizes by laser etching, spread the metal mask template on a filter membrane with a certain pore size, measure 5 ml of chlorine / bromine-doped graphene suspension aqueous solution, add it dropwise, and use vacuum filtration to evenly precipitate the graphene in the hollow area of the metal template; peel off the metal template from the filter membrane, and obtain a graphene pattern with a specific shape on the filter membrane, cover the filter membrane with the graphene pattern with a clean polyethylene terephthalate transparent film, apply a pressure of about 0.1-0.6 MPa and maintain it at this pressure for 1-3 minutes, transfer the graphene pattern to the polyethylene terephthalate substrate, and obtain a flexible interdigitated electrode, such as Figure 6 As shown, the pattern shape, size, thickness and spacing of the hollow areas of the metal hollow template can be adjusted arbitrarily without short circuiting. Polyvinyl alcohol / sulfuric acid aqueous gel is used as the electrolyte, coated on the interdigital area of the electrode pattern, and encapsulated with a flexible film such as tape to produce a flexible interdigital supercapacitor.
[0029] 4. By exploring and optimizing the concentration of ammonium chloride and ammonium bromide in sulfuric acid solution, the doping atomic content and ratio of chlorine and bromine in graphene can be regulated, such as Figure 7 As shown in Figure 2, the ratio and content of chlorine / bromine in graphene nanosheets obtained by electrocorroding graphite in 0.1 mol / L sulfuric acid solution with different ammonium chloride and ammonium bromide concentrations can be improved by optimizing the content of chlorine and bromine doping, as shown in Figure 2. Figure 8 As shown, compared with mono-chlorine and mono-bromine doped graphene nanosheets, the chlorine-bromine doped graphene nanosheets prepared by electrocorroding graphite in a 0.1 mol / L sulfuric acid solution with an ammonium chloride concentration of 0.039 mol / L and an ammonium bromide concentration of 0.0033 mol / L, in which the atomic content of chlorine is 0.91 (at.%) and the atomic content of bromine is 1.50 (at.%), show higher specific capacity than graphene nanosheets with other contents, indicating that the specific capacity of graphene can be significantly improved by optimizing the doping ratio and content of chlorine and bromine.
[0030] 5. The obtained flexible interdigital supercapacitor was subjected to a cycle stability test, such as Fig. 9 As shown, at 5 A cm -3 After 300,000 cycles, the capacity retention rate is greater than 97%. By observing the cross-sectional structure of the electrode before and after the cycle, the entire electrode structure still maintains the original layered structure after the cycle, and there is no agglomeration and stacking of graphene nanosheets. Fig.10 shown.
[0031] 6. The obtained flexible interdigital supercapacitor was subjected to a bending resistance test. Compared with the unbending state, the capacity retention rate was greater than 97% when the bending degrees were 30, 60, 90, 120, 150 and 180 degrees, showing excellent bending resistance and mechanical flexibility. Fig.11 shown.
[0032] 7. Integrate different electrode patterns on the same polyethylene terephthalate substrate using a series-parallel connection method. Fig.12 The photo shows three series-parallel supercapacitors without metal wires, adhesives and conductive agents. The output voltage of a single supercapacitor is 0.8 V, which increases linearly with the number of supercapacitors in series. The three parallel supercapacitors achieve a linear increase in output current.
[0033] 8. Integrate different electrode patterns on the same polyethylene terephthalate substrate using a series-parallel connection method. Fig.13 The film shows six actual series-parallel connections using metal-free wires, adhesives and conductive agents, which can light up multiple LED lights and power electronic watches in different bending states.
[0034] 9. Integrate different electrode patterns on the same polyethylene terephthalate substrate using a series-parallel connection method. Fig.14 Shows six actual series-parallel connections using metal-free wires, adhesives, and conductive agents to light up a long light strip.
[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.
Claims
1. A method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine-doped graphene nanosheets, characterized in that: Chlorine / bromine doped graphene nanosheets were prepared by one-step graphite electrocorrosion technology. The doping ratio and content of chlorine / bromine in graphene nanosheets can be controlled by adjusting the concentration of ammonium halide. The graphene nanosheet aqueous solution was filtered under reduced pressure to fill the graphene into the hollow part of the metal template. The graphene electrode pattern in the hollow area was transferred to a polymer transparent film. The aqueous gel electrolyte was applied to the electrode pattern, solidified and film-encapsulated to construct a flexible interdigital supercapacitor with a capacitance of 5 A cm -3 It can be continuously cycled for 300,000 times with a capacity retention rate of more than 97%. There is no capacity attenuation problem caused by graphene agglomeration and stacking. It has excellent cycle stability. The flexible interdigitated supercapacitor can be bent at any angle with a capacity retention rate of more than 97%. Single supercapacitors are combined in series and parallel to prepare integrated circuits, which can power multiple LED lights, electronic watches and light strips.
2. The method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine doped graphene nanosheets as claimed in claim 1, characterized in that: The chlorine / bromine doped graphene nanosheets are highly transparent and stable. The concentration of the chlorine / bromine doped graphene nanosheets aqueous solution is 0.01-2 mg / ml and can be placed for three months without coagulation.
3. The method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine doped graphene nanosheets as claimed in claim 1, characterized in that: The flexible interdigital supercapacitor has a high performance at 5 A cm -3 After 300,000 continuous cycles, the capacity retention rate is greater than 97%, and the graphene electrode structure still maintains the initial layered structure, without capacity attenuation caused by graphene agglomeration and stacking.
4. The method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine doped graphene nanosheets as claimed in claim 1, characterized in that: The constructed flexible interdigital supercapacitor has a capacity retention rate of more than 97% at any bending angle and has excellent bending resistance and mechanical flexibility.
5. The method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine doped graphene nanosheets as claimed in claim 1, characterized in that: The preparation of the chlorine / bromine doped graphene nanosheet aqueous solution comprises the following steps: 1) In a mixed solution of ammonium chloride and ammonium bromide in dilute sulfuric acid, apply a voltage of 5-15 V in a two-electrode system, with graphite raw material as the working electrode, apply the voltage for 10-15 minutes, and the reaction temperature is room temperature; 2) By exploring and optimizing the concentrations of ammonium chloride and ammonium bromide in dilute sulfuric acid electrolyte, the doping ratio and content of chlorine / bromine in graphene nanosheets can be adjusted. The optimized concentration of ammonium chloride in sulfuric acid solution is 0.01-0.1 mol / L, and the optimized concentration of ammonium bromide in sulfuric acid solution is 0.001-0.01 mol / L. 3) The solution obtained in step 1) is filtered and washed 3-5 times with deionized water under reduced pressure, ultrasonicated at room temperature for 10-40 min, allowed to stand for 10-48 hours, and the upper layer solution is taken to obtain a chlorine / bromine doped graphene nanosheet aqueous solution.
6. The method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine doped graphene nanosheets as claimed in claim 1, characterized in that: The atomic ratio and content of chlorine / bromine doping can be regulated by optimizing and changing the concentration of ammonium chloride and ammonium bromide in the electrolyte, thereby optimizing and improving the specific capacity of graphene.
7. The method for constructing high-performance flexible interdigital supercapacitors and integrated circuits using chlorine / bromine doped graphene nanosheets as claimed in claim 1, characterized in that: The method for constructing a high-performance flexible interdigital supercapacitor and an integrated circuit using chlorine / bromine-doped graphene nanosheets can control the shape, size, thickness and interdigital spacing of the pattern in the hollow area according to the metal hollow template, and construct an integrated circuit by adjusting the number of series-parallel flexible interdigital supercapacitors to achieve flexible regulation of the output power, and can provide power support for multiple LED lamps, electronic watches and light strips.