Acid-free alkali-free green method for preparing long flame coal-based capacitor carbon and application of acid-free alkali-free green method

Abstract

The invention discloses an acid-free alkali-free green method for preparing long flame coal-based capacitor carbon, which comprises the following steps: pyrolyzing long flame coal to obtain semi-coke, fully grinding and mixing the long flame coal pyrolyzed semi-coke with a certain amount of sodium percarbonate, and pre-oxidizing at low temperature to obtain a precursor; and heating the precursor, potassium carbonate and water while stirring until water is completely evaporated, grinding, transferring into a tubular furnace for activation, washing with water, and drying to obtain the long flame coal-based capacitor carbon. The construction method of the long flame coal-based capacitor carbon is simple and does not need to use any acid and alkali. Sodium percarbonate is used for pre-oxidation to regulate and control the pore structure of the semicoke, and oxygen-containing functional groups are introduced to promote the conversion from micropores to mesopores in the subsequent activation process, so that the high specific surface area characteristic of the micropores is reserved, the chambering capacity of the mesopores is enhanced, and the specific capacitance and rate capability of the capacitor carbon are improved. The method is simple and feasible, can be used for large-scale production, and shows a wide application prospect in the fields of new energy, electronics, electric power, traffic and the like.

Description

Technical Field

[0001] This invention belongs to the field of coal grading and high-value utilization technology, and in particular relates to a method for the preparation of long-flame coal-based capacitor carbon in a green, acid-free and alkali-free manner and its application. Background Technology

[0002] Coal is one of my country's important minerals and serves as a ballast and stabilizer for my country's energy security.

[0003] Long-flame coal is the bituminous coal with the lowest degree of coalification. It has extremely high volatile matter content (dry ash-free volatile matter >37%), and the flame is long and obvious when burning. However, it has very weak caking properties (the thickness of the plastic layer is ≤5mm). It belongs to non-coking coal. It has a high calorific value, but poor thermal stability. Xinjiang is the region with the richest long-flame coal resources in China (accounting for 95% of the country's low-rank coal reserves). Its current utilization status shows the following characteristics: (1) Concentrated reserves. It is mainly distributed in coalfields such as Zhundong, Turpan-Hami, and Ili. The proven reserves of Zhundong coalfield exceed 200 billion tons, of which long-flame coal accounts for more than 60%. (2) It has the characteristics of low ash (<10%) and low sulfur (<0.5%).

[0004] Five major coal chemical bases have been initially established in Zhundong, Yili, Tuha, Kubai, and Heke, with a focus on developing modern coal chemical industries such as coal-to-gas and coal-to-olefins. Landmark projects such as the Xinjiang coal-to-oil project of the State Energy Group (4 million tons / year) have been put into operation. Nevertheless, the comprehensive utilization of long-flame coal still faces the following problems and challenges: (1) Water resource constraints. Each ton of coal consumes about 2.5 m³ of water, and mining areas such as Zhundong face serious water shortage problems. (2) High transportation costs. The freight cost to East China is about 200 yuan / ton, and the annual transport capacity of the Hongnao Railway of 150 million tons is still difficult to meet the demand for external transportation. (3) Great environmental protection pressure. The wastewater reuse rate of modern coal chemical projects needs to reach more than 98%, and some enterprises still face the risk of non-compliance with emission standards. (4) Insufficient industrial chain extension. The development of high value-added products (such as carbon fiber, capacitor carbon, and graphene) is still in its initial stage.

[0005] In summary, the technology for the graded utilization of long-flame coal is key to the efficient utilization of this coal type. Currently, the preparation of capacitor carbon from long-flame coal is still in the preliminary research stage. There are no publicly reported studies on the preparation of capacitor carbon from semi-coke obtained by long-flame coal pyrolysis using sodium percarbonate and potassium carbonate for pre-oxidation and activation. Summary of the Invention

[0006] This invention provides a green method for preparing long-flame coal-based capacitor carbon without acid or alkali and its application, in order to solve the problems of long-flame coal being easy to weather and break, having low thermal efficiency when directly burned, and having low strength of coke obtained from pyrolysis.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A green method for preparing long-flame coal-based capacitor carbon without acid or alkali involves firstly pyrolyzing long-flame coal to obtain semi-coke, then thoroughly grinding and mixing the semi-coke with a certain amount of sodium percarbonate, followed by low-temperature pre-oxidation to obtain a precursor. The precursor, potassium carbonate, and water are then mixed and heated while stirring until the water evaporates completely. The resulting solid mixture is then ground evenly and transferred to a tube furnace for activation. After activation, the mixture is washed and dried to obtain long-flame coal-based capacitor carbon. The preparation process of this long-flame coal-based capacitor carbon does not require the use of any acid or alkali. The use of sodium percarbonate pre-oxidation can regulate the pore structure of the semi-coke. By introducing oxygen-containing functional groups, the transformation of micropores into mesopores is promoted during subsequent activation, forming a hierarchical porous structure. This hierarchical porous structure retains the high specific surface area characteristics of micropores while enhancing the expansion ability of mesopores, thus helping to improve the specific capacitance and rate performance of the capacitor carbon.

[0008] A method for preparing long-flame coal-based capacitor carbon in an acid- and alkali-free, green manner includes the following steps: Step 1: Grind the long-flame coal to a particle size of less than 200 mesh, then transfer it into a tubular furnace and heat it at 20 °C for 1 minute under nitrogen protection. -1 The heating rate was adjusted to raise the temperature to 600 °C and hold it for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke; the long-flame coal pyrolysis semi-coke was thoroughly ground and mixed with a certain amount of sodium percarbonate (2Na2CO3·3H2O2) solid, and then fed into a tube furnace, heated to a certain temperature and held for 30~90 min to perform low-temperature pre-oxidation of the semi-coke, and then cooled to room temperature to obtain the precursor; Step 2: Transfer the precursor described in Step 1 into a beaker, add a certain amount of potassium carbonate and water, and heat while stirring until the water evaporates. Grind the resulting solid mixture until homogeneous, then transfer it into a tube furnace and heat under nitrogen protection at 20°C for [time missing]. -1 The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 to 3 hours, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 minutes, washed with water, filtered, dried, and the collected powder was obtained as capacitor carbon.

[0009] Furthermore, in step one, the mass ratio of long-flame coal pyrolysis semi-coke to sodium percarbonate is 1: 0.05~0.2.

[0010] Furthermore, in step one, the temperature range for the low-temperature pre-oxidation of the semi-coke is 100~150 ℃.

[0011] Furthermore, in step two, the mass ratio of the precursor, potassium carbonate, and water is 1:0.2~1:2~20.

[0012] A method for preparing long-flame coal-based capacitor carbon is used to prepare capacitor carbon energy storage electrodes.

[0013] The preparation method of the capacitor carbon energy storage electrode is as follows: capacitor carbon, polytetrafluoroethylene solution, acetylene black and deionized water are stirred and mixed at room temperature until the mixture is a uniform paste. The paste is then uniformly coated on the surface of nickel foam and dried to obtain the capacitor carbon energy storage electrode.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The method for constructing the long-flame coal-based capacitor carbon of the present invention is simple and easy to implement, and the preparation process does not require the use of any acid or alkali.

[0015] (2) The present invention uses sodium percarbonate pre-oxidation to regulate the pore structure of semi-coke. By introducing oxygen-containing functional groups (such as carboxyl groups, hydroxyl groups, etc.), the transformation of micropores into mesopores is promoted during the subsequent activation process, forming a hierarchical porous structure. This structure retains the high specific surface area characteristics of micropores and enhances the pore-expanding ability of mesopores, which helps to improve the specific capacitance and rate performance of capacitor carbon.

[0016] (3) This invention is simple and feasible, and can be mass-produced. It realizes the green preparation of capacitor carbon without acid or alkali, and the obtained long-flame coal-based capacitor carbon has good rate performance, showing broad application prospects in new energy, electronics, power and transportation fields. Attached Figure Description

[0017] Figure 1 These are the constant current charge-discharge curves of capacitor carbon A under different current densities in Example 5; Figure 2 This is a rate performance diagram of capacitor carbon A in Example 5; Figure 3 This is a SEM image of capacitor carbon B in Example 6; Figure 4 This is the XRD pattern of capacitor carbon B in Example 6; Figure 5 This is the Raman plot of capacitor carbon B in Example 6; Figure 6 These are the constant current charge-discharge curves of capacitor carbon B under different current densities in Example 8; Figure 7 This is a rate performance diagram of capacitor carbon B in Example 8. Detailed Implementation

[0018] This invention includes a method for preparing long-flame coal-based capacitor carbon in a green, acid- and alkali-free manner, and its application.

[0019] Example 1: The preparation method of the long-flame coal pyrolysis semi-coke includes: grinding the long-flame coal to a particle size of less than 200 mesh, then transferring it into a tube furnace, and heating it at 20 °C for 1 minute under nitrogen protection. -1The heating rate was adjusted to raise the temperature to 600 °C and hold it for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke.

[0020] Example 2: This example differs from Example 1 in that the long-flame coal used in this example is No. 8 coal from the No. 106 coal mine of China Coal Energy Xinjiang Tianshan Coal and Electricity Co., Ltd.

[0021] Example 3: This example differs from Example 1 or 2 in that the preparation method of the long-flame coal pyrolysis semi-coke includes: grinding No. 8 coal from the No. 106 coal mine of China Coal Energy Xinjiang Tianshan Coal and Electricity Co., Ltd. to a particle size of less than 200 mesh, and then transferring it into a tubular furnace, and heating it at 20 ℃ min under nitrogen protection. -1 The temperature was increased to 600 °C and held for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke. 1.5 g of the above long-flame coal pyrolysis semi-coke was weighed, thoroughly ground and mixed, and then fed into a tube furnace, heated to 120 °C and held for 60 min to obtain precursor A. Further, 1 g of precursor A and 0.5 g of potassium carbonate were weighed, transferred to a beaker, and 5 mL of water was added. The water was evaporated while stirring and heating. The resulting solid mixture was then ground evenly and transferred into a tube furnace. Under nitrogen protection, the mixture was heated at 20 °C for 1 min. -1 The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 h, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 min, washed with water, filtered, dried, and the collected powder was capacitor carbon A.

[0022] Example 4: This example differs from Examples 1-3 in that the preparation method of the capacitor carbon A energy storage electrode includes: weighing 0.1 g of capacitor carbon A from Example 3, 0.125 g of polytetrafluoroethylene solution (10 wt%), 0.0125 g of acetylene black, and 0.125 g of deionized water, and stirring and mixing at room temperature for 30 min until the mixture forms a uniform paste. The paste is then uniformly coated onto the surface of nickel foam and dried at 60 °C for 10 h to obtain the capacitor carbon A energy storage electrode.

[0023] Example 5: This example differs from Examples 1-4 in that the three-electrode capacitor uses the carbon A energy storage electrode from Example 4 as the working electrode, a Pt sheet as the auxiliary electrode, and an Ag / AgCl electrode as the reference electrode. 6 mol L -1 KOH was used as the electrolyte. The electrochemical performance of capacitor carbon A was tested using a Xinwei high-performance battery tester. During the test, the Ag / AgCl reference electrode was connected to the positive potential line of the Xinwei high-performance battery tester, the Pt plate was connected to the positive current line, and the working electrode was connected to the negative current and potential lines.

[0024] Figure 1The figures show the constant current charge-discharge curves of capacitor carbon A in Example 5 at different current densities. As can be seen from the figures, the charge-discharge curves of the sample are symmetrical isosceles triangles without plateaus, indicating that the capacitive behavior of capacitor carbon A has not changed and remains a double-layer capacitor. At higher current densities, the charge-discharge time is correspondingly shortened, but the shape of the constant current charge-discharge curve remains essentially unchanged.

[0025] Figure 2 This is a rate performance graph of capacitor carbon A in Example 5 at different current densities. As can be seen from the graph, at a relatively low current density of 0.5 A / g... -1 At that time, the specific capacitance of capacitor carbon A was 171.0 F / g. -1 As the current density increases, the specific capacitance of capacitor carbon A gradually decreases. When the current density increases to 10 A g... -1 At that time, the specific capacitance of capacitor carbon A decreased to 120.0 F g. -1 As can be seen, capacitor carbon A exhibits good capacitance retention under high current density, with a capacitance retention rate of 70.2%.

[0026] Example 6: This example differs from Examples 1-5 in that the preparation method of the long-flame coal pyrolysis semi-coke includes: grinding No. 8 coal from the No. 106 coal mine of China Coal Energy Xinjiang Tianshan Coal and Electricity Co., Ltd. to a particle size of less than 200 mesh, and then transferring it into a tubular furnace, and heating it at 20 ℃ min under nitrogen protection. -1 The temperature was increased to 600 °C and held for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke. 1.5 g of long-flame coal pyrolysis semi-coke was weighed, and 0.15 g of sodium percarbonate (2Na₂CO₃·3H₂O₂) solid was added. After thorough grinding and mixing, the mixture was placed in a tube furnace and heated to 120 °C for 60 min to obtain precursor B. Further, 1 g of precursor B and 0.5 g of potassium carbonate were weighed, transferred to a beaker, and 5 mL of water was added. The mixture was heated while stirring until the water evaporated. The resulting solid mixture was then ground evenly and transferred to a tube furnace. Under nitrogen protection, the mixture was heated at 20 °C for 1 min. -1 The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 h, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 min, washed with water, filtered, dried, and the collected powder was capacitor carbon B.

[0027] Figure 3 This is a SEM image of capacitor carbon B in Example 6. As can be seen from the image, capacitor carbon B has a large blocky structure with a small number of small particles. The surface of the large capacitor carbon B blocks is uneven and has a large number of pores. Some of these pores are cross-linked, which helps electrolyte ions to diffuse rapidly to the surface of the carbon material, thereby facilitating the formation of an electric double layer.

[0028] Figure 4This is the XRD pattern of capacitor carbon B in Example 6. In 2 θ The broad peaks observed at around 24 and 43 degrees correspond to the diffraction peaks of the (0 0 2) and (1 0 0) crystal planes of the porous carbon material, respectively, indicating that the main component of capacitor carbon B is amorphous porous carbon.

[0029] Figure 5 This is the Raman spectrum of capacitor carbon B in Example 6. As can be seen from the figure, at 1340 cm⁻¹... -1 and 1577 cm -1 Two peaks can be observed, corresponding to the D peak and G peak of porous carbon, respectively. The D peak is caused by defects in the porous carbon material, while the G peak is due to sp... 2 Caused by vibrations of hybrid carbon-carbon bonds. At 2669 cm⁻¹ -1 The peak at that location corresponds to the 2D peak of porous carbon.

[0030] Example 7: This example differs from Examples 1-6 in that the preparation method of the capacitor carbon B energy storage electrode includes: weighing 0.1 g of capacitor carbon B from Example 6, 0.125 g of polytetrafluoroethylene solution (10 wt%), 0.0125 g of acetylene black, and 0.125 g of deionized water, and stirring and mixing at room temperature for 30 min until the mixture forms a uniform paste. The paste is then uniformly coated onto the surface of nickel foam and dried at 60 °C for 10 h to obtain the capacitor carbon B energy storage electrode.

[0031] Example 8: This example differs from Examples 1-7 in that the three-electrode capacitor uses the carbon B energy storage electrode from Example 7 as the working electrode, a Pt sheet as the auxiliary electrode, and an Ag / AgCl electrode as the reference electrode. 6 mol L -1 KOH was used as the electrolyte. The electrochemical performance of capacitor carbon B was tested using a Xinwei high-performance battery tester. During the test, the Ag / AgCl reference electrode was connected to the positive potential line of the Xinwei high-performance battery tester, the Pt plate was connected to the positive current line, and the working electrode was connected to the negative current and potential lines.

[0032] Figure 6 The figures show the constant current charge-discharge curves of capacitor carbon B in Example 8 at different current densities. As can be seen from the figures, the charge-discharge curves of the sample are symmetrical isosceles triangles without plateaus, indicating that capacitor carbon B exhibits good double-layer capacitance characteristics.

[0033] Figure 7 This is a rate performance graph of capacitor carbon B in Example 8. As can be seen from the graph, at 0.5 A g... -1 The specific capacitance of carbon B is 195.1 F / g. -1 , in 10 A g -1 The specific capacitance is 160.0 F g. -1As can be seen, capacitor carbon B exhibits good capacitance retention at high current densities, with a retention rate of 82.0%, which is higher than that of capacitor carbon A. Furthermore, at all the same current densities, the specific capacitance of capacitor carbon B is higher than that of capacitor carbon A, indicating that sodium percarbonate pre-oxidation can regulate the pore structure of the semi-coke. The introduction of oxygen-containing functional groups (such as carboxyl and hydroxyl groups) promotes the transformation of micropores into mesopores during subsequent activation, forming a hierarchical porous structure. This structure retains the high specific surface area characteristics of micropores while enhancing the expansion ability of mesopores, thus contributing to improved specific capacitance and rate performance of the capacitor carbon.

[0034] Example 9: This example differs from Examples 1-8 in that the preparation method of the long-flame coal pyrolysis semi-coke includes: grinding No. 8 coal from the No. 106 coal mine of China Coal Energy Xinjiang Tianshan Coal and Electricity Co., Ltd. to a particle size of less than 200 mesh, and then transferring it into a tubular furnace, and heating it at 20 ℃ min under nitrogen protection. -1 The temperature was increased to 600 °C and held for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke. 1.5 g of long-flame coal pyrolysis semi-coke was weighed, and 0.075 g of sodium percarbonate (2Na₂CO₃·3H₂O₂) solid was added. After thorough grinding and mixing, the mixture was placed in a tube furnace and heated to 100 °C for 60 min to obtain precursor C. Further, 1 g of precursor C and 0.2 g of potassium carbonate were weighed, transferred to a beaker, and 20 mL of water was added. The water was evaporated while stirring and heating. The resulting solid mixture was then ground evenly and transferred to a tube furnace. Under nitrogen protection, the mixture was heated at 20 °C for 1 min. -1 The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 h, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 min, washed with water, filtered, dried, and the powder collected was capacitor carbon C.

[0035] Example 10: This example differs from Examples 1-9 in that the preparation method of the long-flame coal pyrolysis semi-coke includes: grinding No. 8 coal from the No. 106 coal mine of China Coal Energy Xinjiang Tianshan Coal and Electricity Co., Ltd. to a particle size of less than 200 mesh, and then transferring it into a tubular furnace, and heating it at 20 ℃ min under nitrogen protection. -1 The temperature was increased to 600 °C and held for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke. 1.5 g of long-flame coal pyrolysis semi-coke was weighed, and 0.3 g of sodium percarbonate (2Na₂CO₃·3H₂O₂) solid was added. After thorough grinding and mixing, the mixture was placed in a tube furnace and heated to 150 °C for 60 min to obtain precursor D. Further, 1 g of precursor D and 1.2 g of potassium carbonate were weighed, transferred to a beaker, and 20 mL of water was added. The mixture was heated while stirring until the water evaporated. The resulting solid mixture was then ground evenly and transferred to a tube furnace. Under nitrogen protection, the mixture was heated at 20 °C for 1 min. -1The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 h, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 min, washed with water, filtered, dried, and the powder collected was capacitor carbon D.

[0036] Example 11: This example differs from Examples 1-10 in that the preparation method of the long-flame coal pyrolysis semi-coke includes: grinding No. 8 coal from the No. 106 coal mine of China Coal Energy Xinjiang Tianshan Coal and Electricity Co., Ltd. to a particle size of less than 200 mesh, and then transferring it into a tubular furnace, and heating it at 20 ℃ for 1 minute under nitrogen protection. -1 The temperature was increased to 600 °C and held for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke. 1.5 g of long-flame coal pyrolysis semi-coke was weighed, and 0.15 g of sodium percarbonate (2Na₂CO₃·3H₂O₂) solid was added. After thorough grinding and mixing, the mixture was placed in a tube furnace and heated to 120 °C for 60 min to obtain precursor E. Further, 1 g of precursor E and 0.8 g of potassium carbonate were weighed, transferred to a beaker, and 20 mL of water was added. The mixture was heated while stirring until the water evaporated. The resulting solid mixture was then ground evenly and transferred to a tube furnace. Under nitrogen protection, the mixture was heated at 20 °C for 1 min. -1 The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 h, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 min, washed with water, filtered, dried, and the powder collected was capacitor carbon E.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for the preparation of long-flame coal-based capacitor carbon in a green, acid- and alkali-free manner, characterized in that, First, semi-coke is obtained by pyrolysis of long-flame coal. Then, the semi-coke from the pyrolysis of long-flame coal is thoroughly ground and mixed with sodium percarbonate, and then pre-oxidized to obtain a precursor. The precursor, potassium carbonate and water are mixed and heated while stirring until the water evaporates completely. The resulting solid mixture is then ground evenly and transferred to a tube furnace for activation. After activation, it is washed with water and dried to obtain long-flame coal-based capacitor carbon.

2. The method for preparing long-flame coal-based capacitor carbon in a green, acid- and alkali-free manner according to claim 1, characterized in that, Includes the following steps: Step 1: Grind the long-flame coal to a particle size of less than 200 mesh, then transfer it into a tubular furnace and heat it at 20°C for 1 minute under nitrogen protection. -1 The heating rate was adjusted to raise the temperature to 600 °C and hold it for 30 min, then cooled to room temperature to obtain long-flame coal pyrolysis semi-coke; the long-flame coal pyrolysis semi-coke was thoroughly ground and mixed with sodium percarbonate 2Na2CO3·3H2O2 solid, then fed into a tube furnace, heated and held for 30~90 min to perform low-temperature pre-oxidation of the semi-coke, and then cooled to room temperature to obtain the precursor; Step 2: Transfer the precursor described in Step 1 into a beaker, add potassium carbonate and water, and heat while stirring until the water evaporates. Grind the resulting solid mixture until homogeneous, then transfer it into a tube furnace and heat under nitrogen protection at 20°C for [time missing]. -1 The heating rate was adjusted to raise the temperature to 700 ℃, and after holding at that temperature for 1 to 3 hours, the temperature was gradually lowered to room temperature. The product was then removed, sonicated with water for 30 minutes, washed with water, filtered, dried, and the powder collected was capacitor carbon.

3. The method for preparing long-flame coal-based capacitor carbon in a green, acid- and alkali-free manner according to claim 2, characterized in that, In step one, the mass ratio of long-flame coal pyrolysis semi-coke to sodium percarbonate is 1: 0.05~0.

2.

4. The method for preparing long-flame coal-based capacitor carbon in a green, acid- and alkali-free manner according to claim 2, characterized in that, In step one, the temperature range for low-temperature pre-oxidation of semi-coke is 100~150 ℃.

5. The method for preparing long-flame coal-based capacitor carbon in a green, acid- and alkali-free manner according to claim 2, characterized in that, In step two, the mass ratio of the precursor, potassium carbonate, and water is 1:0.2~1:2~20.

6. The long-flame coal-based capacitor carbon obtained by any one of the preparation methods according to claims 1-5 is used to prepare capacitor carbon energy storage electrodes.

7. According to the application described in claim 6, the preparation method of the capacitor carbon energy storage electrode is as follows: capacitor carbon, polytetrafluoroethylene solution, acetylene black and deionized water are stirred and mixed at room temperature until the mixture is a uniform paste, and then the paste is uniformly coated on the surface of nickel foam and dried to obtain the capacitor carbon energy storage electrode.

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