Coal-based super capacitor carbon and green activation method for producing coal-based super capacitor carbon

Abstract

The invention belongs to the field of coal-based super-capacitor carbon preparation, and discloses coal-based super-capacitor carbon and a green activation method for producing the coal-based super-capacitor carbon, and the method comprises the following steps: uniformly mixing a coal-based carbonized material with soluble carbonate to obtain a mixture A; activating the mixture A in a protective atmosphere to obtain a pre-activated material; activating the pre-activated material in a mixed atmosphere of shielding gas and carbon dioxide to obtain a deep activated material; and washing the deeply activated material to remove soluble carbonate in the deeply activated material, and then filtering and drying to obtain the coal-based supercapacitor carbon. The method does not involve strong base, and has good environmental friendliness. And in the aspect of carbon material structure regulation and control, mesopores and micropores are respectively constructed by using a segmented activation process, so that a relatively good hierarchical pore channel structure is formed, and the energy storage performance of the supercapacitor is facilitated. Compared with random etching in a traditional mode, the mesoporous proportion is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of preparation of coal-based supercapacitor carbon, and particularly relates to a coal-based supercapacitor carbon and a green activation method for producing the same. Background Art

[0002] As the core electrode material of supercapacitors, coal-based supercapacitor carbon shows significant economic advantages in the field of energy storage materials due to its large raw material reserves, low cost (the price of lignite is only 1 / 3 - 1 / 5 of that of biomass raw materials), and high carbon yield. However, its industrial application still faces key technical bottlenecks:

[0003] 1. Activation Dilemma Caused by Raw Material Structure Characteristics

[0004] The microscopic structure of coal is mainly composed of polycyclic aromatic nuclear molecules. After carbonization, a highly ordered microcrystalline structure is formed (the average layer spacing d002 is about 0.35 - 0.38 nm). This dense structure hinders the effective penetration of the activator. Traditional steam activation (the specific surface area is usually lower than 800 m 2 / g) or conventional KOH activation (when the activator / carbon ratio is 1:1, the specific surface area is only 1200 m 2 / g) is difficult to achieve the full development of the pore structure.

[0005] 2. Double-edged Sword Effect of High-proportion KOH Activation

[0006] The current mainstream process adopts an enhanced activation strategy with a mass ratio of KOH activator to carbon raw material ≥ 4:1. Although the specific surface area can be increased to 2000 - 3000 m 2 / g, it brings significant drawbacks:

[0007] (1) Economic Deterioration: The cost of the activator accounts for more than 60% of the total raw material cost, reducing the price competitiveness of the final product.

[0008] (2) Increased Environmental Load: 8 - 12 tons of alkaline wastewater are generated per ton of activated carbon, and subsequent neutralization treatment increases the production cost by 15% - 20%.

[0009] (3) Risk of Structure Damage: Excessive KOH causes the collapse of the microporous wall, and the mesopore ratio drops below 40%, affecting ion transport kinetics.

[0010] 3. Breakthrough Directions of Innovative Processes

[0011] In recent years, many studies have achieved cost reduction and efficiency improvement through process optimization:

[0012] (1) Pre-carbonization - Activation Synergistic Path: For example, the team from Harbin Institute of Technology used pre-carbonization at 700 °C to construct a primary carbon skeleton, reducing the subsequent KOH dosage by 50% while still obtaining a specific surface area > 2500 m 2materials with a specific surface area of ≥2500 m² / g and a graphitization degree increased by 30%. However, this method still essentially uses potassium hydroxide activation, and the subsequent problem of alkaline wastewater has not been fundamentally solved.

[0013] (2) Composite activator system: Using KOH and K2CO3 / KFeO4 and other co-activators (ratio 1:1), the utilization rate of the activator is increased by 40% through the molten salt medium effect, and at the same time, an FeO coating structure is formed to enhance the stability of the material. However, the iron element introduced by this method will greatly harm the cycle stability performance of the supercapacitor, and the activator will still form unrecyclable waste liquid subsequently.

[0014] In summary, there is currently no excellent and green pollution-free activation method, which directly affects the production cost and environmental protection cost of coal-based supercapacitor carbon. Summary of the Invention

[0015] To solve the problems existing in the prior art, the purpose of the present invention is to provide a coal-based supercapacitor carbon and a green activation method for producing the same. The present invention can increase the mesopore ratio of the carbon material, does not involve strong alkali, and has good environmental friendliness.

[0016] To achieve the above purpose, the present invention adopts the following technical solutions:

[0017] A green activation method for producing coal-based supercapacitor carbon, including the following processes:

[0018] Mix the coal-based carbonized material and the soluble carbonate evenly to obtain mixture A;

[0019] Activate the mixture A in a protective atmosphere to obtain a pre-activated material;

[0020] Activate the pre-activated material in a mixed atmosphere of a protective gas and carbon dioxide to obtain a deeply activated material;

[0021] Wash the deeply activated material to remove the soluble carbonate in the deeply activated material, and then filter and dry to obtain the coal-based supercapacitor carbon.

[0022] Preferably, in mixture A, the mass ratio of the coal-based carbonized material to the soluble carbonate is 1:(1 - 0.2).

[0023] Preferably, the soluble carbonate is at least one of potassium carbonate and sodium carbonate.

[0024] Preferably, when activating the mixture A in a protective atmosphere, the activation temperature is 700 - 900 °C, the activation time is 1 - 2 hours, and after the heat preservation is completed, it is cooled to obtain the pre-activated material.

[0025] Preferably, when activating the pre-activated material in a mixed atmosphere of a protective gas and carbon dioxide, the activation temperature is 700 - 900 °C, the activation time is 1 - 2 hours, and after the heat preservation ends, it is cooled to obtain a deeply activated material.

[0026] Preferably, when activating the pre-activated material in a mixed atmosphere of a protective gas and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:(1 - 2).

[0027] Preferably, the protective gas is nitrogen or argon.

[0028] Preferably, when activating the mixture A in a protective atmosphere, after the heat preservation ends, the atmosphere is switched to a mixed atmosphere of a protective gas and carbon dioxide to activate the pre-activated material.

[0029] Preferably, after washing and filtering the deeply activated material, the obtained filtrate is subjected to evaporation and recrystallization to precipitate soluble carbonate, the precipitated soluble carbonate is separated and dried, and the evaporated pure water is used to wash the deeply activated material.

[0030] The present invention also provides a method for producing coal-based supercapacitor carbon, which is prepared by the green activation method as described above in the present invention.

[0031] The present invention has the following beneficial effects:

[0032] In the green activation method for producing coal-based supercapacitor carbon of the present invention, only soluble carbonate is used as the additional material, which is easy to obtain and is not a strong base, and the raw material cost is relatively low compared with the traditional potassium hydroxide activation. Moreover, by-product carbon monoxide gas can be generated during pre-activation, and the obtained carbon monoxide gas can be separated and used as fuel, so that the energy is fully utilized. During deep activation, the present invention only changes the activation atmosphere on the basis of pre-activation, and the operation is relatively convenient. In addition, the carbon dioxide gas used for activation is easy to obtain and has a very low cost. The present invention washes the obtained deeply activated material with water to wash away the soluble carbonate in the deeply activated material. The operation is relatively simple and the cost is low. Moreover, the washing liquid containing soluble carbonate can be reused, and the soluble carbonate is separated and recycled. It can be seen that the present invention does not involve strong bases and has good environmental friendliness. And in the aspect of carbon material structure regulation, the present invention uses a segmented activation process to construct mesopores and micropores respectively, forming a better hierarchical pore structure, which is beneficial to the energy storage performance of supercapacitors. Compared with the random etching of the traditional method, the proportion of mesopores is greatly increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of the green activation method for producing coal-based supercapacitor carbon of the present invention.

[0034] Figure 2This is the scanning electron microscope photograph of the coal-based supercapacitor carbon obtained in Example 1 of the present invention.

[0035] Figure 3 Comparison diagram of the pore structures of the coal-based supercapacitor carbon obtained in Example 1 of the present invention and that obtained by the traditional activation process. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] See Figure 1 , the green activation method for producing coal-based supercapacitor carbon of the present invention includes the following steps:

[0038] Step 1: Mix the coal-based carbonized material and the soluble carbonate evenly to obtain mixture A; wherein, in mixture A, the mass ratio of the coal-based carbonized material to the soluble carbonate is 1:(1 - 0.2); the soluble carbonate uses at least one of potassium carbonate and sodium carbonate.

[0039] Step 2: Activate the mixture A obtained in Step 1 in a protective atmosphere (nitrogen or argon can be used) to obtain a pre-activated material; wherein, the activation temperature is 700 - 900 °C, and the activation time is 1 - 2 hours.

[0040] Step 3: Activate the pre-activated material obtained in Step 2 in a mixed atmosphere of a protective gas and carbon dioxide to obtain a deeply activated material; wherein, in the mixed atmosphere of the protective gas and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:(1 - 2); the activation temperature is 700 - 900 °C, the activation time is 1 - 2 hours, and after the heat preservation ends, it is cooled to room temperature.

[0041] Step 4: Wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonate in the deeply activated material, and then filter and dry it to obtain the coal-based supercapacitor carbon.

[0042] Step 5: Evaporate and recrystallize the washing liquid obtained in Step 4 to precipitate soluble carbonate. Separate the precipitated soluble carbonate and dry it. Use the evaporated pure water in Step 4 to wash the deeply activated material.

[0043] In the above solution of the present invention, after the heat preservation of the activation process in Step 2 ends, it can be cooled to room temperature with the furnace first to obtain a pre-activated material, and then Step 3 is carried out to obtain a deeply activated material.

[0044] Or after Step 2 is completed, the atmosphere can be directly switched to a mixed atmosphere of protective gas and carbon dioxide to carry out Step 3 to obtain a deeply activated material. This can avoid heat loss during the cooling in Step 2 and help reduce production costs.

[0045] The principle of the above technical solution of the present invention is as follows (taking potassium carbonate as an example of soluble carbonate for illustration, and the principle of sodium carbonate is similar): The raw coal is obtained through a carbonization process to get a coal-based carbonized material, which is first mixed with potassium carbonate. The mass ratio of the carbonized material to potassium carbonate is 1:(1 - 0.2). After uniform mixing, potassium carbonate pre-activation is carried out in a protective atmosphere. The activation temperature is 700 - 900 °C, and the activation time is 1 - 2 hours to form larger mesopores, establishing a gas diffusion channel for the subsequent deep activation of carbon dioxide to generate micropores. The chemical reaction during this activation process is as follows:

[0046]

[0047] Carbon dioxide is introduced into the material pre-activated with potassium carbonate for deep activation. The volume ratio of the protective atmosphere to carbon dioxide is 1:(1 - 2). The activation temperature is 700 - 900 °C, and the activation time is 1 - 2 hours. The chemical reaction during this activation process is as follows:

[0048]

[0049] The reaction product potassium in the previous step reacts with carbon dioxide, which can be described as:

[0050]

[0051] After the activated material is washed, the activated product can be obtained. The main component of the washing wastewater is potassium carbonate. Using the carbon monoxide generated in the two-stage activation reaction as fuel, the evaporation and recrystallization of the waste liquid can be realized. The precipitated potassium carbonate can be reused again; the evaporated water can be recycled as pure water for washing. The present invention can form a closed-loop chemical process, and there is no waste solid or waste liquid in the whole system.

[0052] Example 1

[0053] This example is a green activation method for producing coal-based supercapacitor carbon, including the following steps:

[0054] Step 1: Mix the coal-based carbonized material and potassium carbonate evenly to obtain mixture A. Among them, in mixture A, the mass ratio of the coal-based carbonized material to potassium carbonate is 1:0.8.

[0055] Step 2: Activate the mixture A obtained in Step 1 in a nitrogen atmosphere to obtain a pre-activated material. Among them, the activation temperature is 800 °C, and the activation time is 1.5 hours.

[0056] Step 3: After the insulation in Step 2 ends, directly introduce carbon dioxide gas, and activate the obtained pre-activated material in a mixed atmosphere of nitrogen and carbon dioxide to obtain a deeply activated material. Among them, in the mixed atmosphere of nitrogen and carbon dioxide, the volume ratio of nitrogen to carbon dioxide is 1:1; the activation temperature is 800 °C, the activation time is 1 hour, and after the insulation ends, it is cooled to room temperature.

[0057] Step 4: Wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonates in the deeply activated material, and then filter and dry it to obtain the coal-based supercapacitor carbon.

[0058] Step 5: Evaporate and recrystallize the washing liquid obtained in Step 4 to precipitate soluble carbonates, separate the precipitated soluble carbonates and dry them, and use the evaporated pure water in Step 4 to wash the deeply activated material.

[0059] The scanning electron microscope photograph of the coal-based supercapacitor carbon obtained in this example is as Figure 2 shown. It can be seen that the shape of the coal-based supercapacitor carbon described in this example is irregular particles with a diameter of 6 - 10 μm, meeting the particle size requirements of the supercapacitor electrode material.

[0060] The comparison diagram of the pore structure of the coal-based supercapacitor carbon obtained in this example and that obtained by the traditional activation process is as Figure 3 shown. It can be seen that the material produced by the present invention has a micropore pore volume as high as 1.03 cm 3 / g and a mesopore pore volume as high as 0.63 cm 3 / g, showing significant advantages compared with the micropore pore volume of 0.25 cm 3 / g and the mesopore pore volume of 0.13 cm 3 / g of the traditional activation method. In terms of specific surface area, this example can reach more than 2500 m 2 / g, showing significant advantages compared with about 1600 m 2 / g of the traditional activation.

[0061] Example 2

[0062] The green activation method for producing coal-based supercapacitor carbon in this example includes the following steps:

[0063] Step 1: Mix the coal-based carbonized material and potassium carbonate evenly to obtain mixture A. Among them, in mixture A, the mass ratio of the coal-based carbonized material to potassium carbonate is 1:0.5.

[0064] Step 2: Activate the mixture A obtained in Step 1 in a nitrogen atmosphere to obtain a pre-activated material. Among them, the activation temperature is 850 °C and the activation time is 100 minutes.

[0065] Step 3: After the insulation in Step 2 ends, directly introduce carbon dioxide gas, and the obtained pre-activated material is activated in a mixed atmosphere of nitrogen and carbon dioxide to obtain a deeply activated material. Among them, in the mixed atmosphere of nitrogen and carbon dioxide, the volume ratio of nitrogen to carbon dioxide is 1:1; the activation temperature is 850 °C, the activation time is 2 hours, and after the insulation ends, it is cooled to room temperature.

[0066] Step 4: Wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonate in the deeply activated material, and then filter and dry to obtain the coal-based supercapacitor carbon.

[0067] Step 5: Evaporate and recrystallize the washing liquid obtained from the washing in Step 4 to precipitate the soluble carbonate, separate the precipitated soluble carbonate and dry it, and use the evaporated pure water in Step 4 to wash the deeply activated material.

[0068] The specific surface area of the capacitor carbon obtained in this example can reach more than 2700 m 2 / g, the micropore pore volume is 1.10 cm 3 / g, and the mesopore pore volume is 0.55 cm 3 / g.

[0069] Example 3

[0070] The green activation method for producing coal-based supercapacitor carbon in this example includes the following steps:

[0071] Step 1: Mix the coal-based carbonized material and potassium carbonate evenly to obtain mixture A. Among them, in mixture A, the mass ratio of the coal-based carbonized material to potassium carbonate is 1:0.2.

[0072] Step 2: Activate the mixture A obtained in Step 1 in an argon atmosphere to obtain a pre-activated material. Among them, the activation temperature is 900 °C and the activation time is 1 hour.

[0073] Step 3: After the insulation in Step 2 ends, directly introduce carbon dioxide gas, and the obtained pre-activated material is activated in a mixed atmosphere of argon and carbon dioxide to obtain a deeply activated material. Among them, in the mixed atmosphere of argon and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:1.5; the activation temperature is 00 °C, the activation time is 1.5 hours, and after the insulation ends, it is cooled to room temperature.

[0074] Step 4: Wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonate in the deeply activated material, and then filter and dry to obtain the coal-based supercapacitor carbon.

[0075] Step 5: Evaporate and recrystallize the washing liquid obtained from the washing in Step 4 to precipitate the soluble carbonate, separate the precipitated soluble carbonate and dry it, and use the evaporated pure water in Step 4 to wash the deeply activated material.

[0076] The specific surface area of the capacitor carbon obtained in this example can reach more than 2000 m 2 / g, the micropore volume is 0.81 cm 3 / g, and the mesopore volume is 0.43 cm 3 / g.

[0077] Example 4

[0078] The green activation method for producing coal-based supercapacitor carbon in this example includes the following steps:

[0079] Step 1: Mix the coal-based carbonized material and potassium carbonate evenly to obtain mixture A; wherein, in mixture A, the mass ratio of the coal-based carbonized material to potassium carbonate is 1:1.

[0080] Step 2: Activate the mixture A obtained in Step 1 in a protective atmosphere of nitrogen atmosphere to obtain a pre-activated material; wherein, the activation temperature is 750 °C and the activation time is 2 hours.

[0081] Step 3: After the heat preservation in Step 2 ends, directly introduce carbon dioxide gas, and activate the obtained pre-activated material in a mixed atmosphere of nitrogen and carbon dioxide to obtain a deeply activated material; wherein, in the mixed atmosphere of nitrogen and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:2; the activation temperature is 750 °C, the activation time is 2 hours, and it is cooled to room temperature after the heat preservation ends.

[0082] Step 4: Wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonate in the deeply activated material, and then filter and dry to obtain the coal-based supercapacitor carbon.

[0083] Step 5: Evaporate and recrystallize the washing liquid obtained from the washing in Step 4 to precipitate the soluble carbonate, separate the precipitated soluble carbonate and dry it, and use the evaporated pure water in Step 4 to wash the deeply activated material.

[0084] The specific surface area of the capacitor carbon obtained in this example can reach more than 2300 m 2 / g, the micropore volume is 0.60 cm 3 / g, and the mesopore volume is 0.50 cm3 / g.

[0085] Example 5

[0086] The green activation method for producing coal-based supercapacitor carbon in this example includes the following steps:

[0087] Step 1: Mix the coal-based carbonized material and sodium carbonate evenly to obtain mixture A; among them, in mixture A, the mass ratio of the coal-based carbonized material to sodium carbonate is 1:0.5.

[0088] Step 2: Activate the mixture A obtained in Step 1 in an argon atmosphere to obtain a pre-activated material; among them, the activation temperature is 700 °C and the activation time is 2 hours.

[0089] Step 3: After the insulation in Step 2 ends, directly introduce carbon dioxide gas, and activate the obtained pre-activated material in a mixed atmosphere of argon and carbon dioxide to obtain a deeply activated material; among them, in the mixed atmosphere of argon and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:2; the activation temperature is 700 °C, the activation time is 2 hours, and it is cooled to room temperature after the insulation ends.

[0090] Step 4: Wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonate in the deeply activated material, and then filter and dry it to obtain the coal-based supercapacitor carbon.

[0091] Step 5: Evaporate and recrystallize the washing liquid obtained by washing in Step 4 to precipitate the soluble carbonate, separate the precipitated soluble carbonate and dry it, and use the evaporated pure water in Step 4 to wash the deeply activated material.

[0092] The specific surface area of the capacitor carbon obtained in this example can reach more than 2000 m 2 / g, the micropore pore volume is 0.50 cm 3 / g, and the mesopore pore volume is 0.35 cm 3 / g.

[0093] Example 6

[0094] The green activation method for producing coal-based supercapacitor carbon in this example includes the following steps:

[0095] Step 1: Mix the coal-based carbonized material, potassium carbonate and sodium carbonate evenly to obtain mixture A; among them, in mixture A, the mass ratio of the coal-based carbonized material to the soluble carbonate (the mass ratio of potassium carbonate to sodium carbonate is 1:1) is 1:0.6.

[0096] Step 2: Activate the mixture A obtained in Step 1 in a nitrogen atmosphere to obtain a pre-activated material; among them, the activation temperature is 800 °C and the activation time is 1 hour.

[0097] Step 3, after the insulation in Step 2 ends, directly introduce carbon dioxide gas, and activate the obtained pre-activated material in a mixed atmosphere of nitrogen and carbon dioxide to obtain a deeply activated material; wherein, in the mixed atmosphere of nitrogen and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:1.5; the activation temperature is 800 °C, the activation time is 1.5 hours, and after the insulation ends, it is cooled to room temperature.

[0098] Step 4, wash the deeply activated material obtained in Step 3 with water to remove the soluble carbonate in the deeply activated material, and then filter and dry it to obtain the coal-based supercapacitor carbon.

[0099] Step 5, evaporate and recrystallize the washing liquid obtained from the washing in Step 4 to precipitate the soluble carbonate, separate the precipitated soluble carbonate and dry it, and use the evaporated pure water in Step 4 to wash the deeply activated material.

[0100] The specific surface area of the capacitor carbon obtained in this embodiment can reach more than 2200 m 2 / g, the micropore volume is 0.90 cm 3 / g, and the mesopore volume is 0.45 cm 3 / g.

[0101] It can be seen from the above experimental results that the technical solution of the present invention has the following advantages in several aspects:

[0102] 1. In terms of economy: The amount of potassium carbonate used in the present invention is extremely low (the ratio to the carbonized material is (0.2 - 1):1), which is greatly reduced compared to the traditional ratio of 4:1 for potassium hydroxide activation, and the cost of carbon dioxide gas is also very low. The by-product carbon monoxide gas is also used as fuel to recover potassium carbonate, and the energy is fully utilized.

[0103] 2. In terms of environmental protection: The present invention does not involve strong alkalis, the washing waste liquid is mainly potassium carbonate and is reasonably recovered, and the water resources are also fully utilized. Compared with the traditional method that requires acid neutralization and treatment of a large amount of alkaline wastewater, it has significant environmental benefits.

[0104] 3. In terms of the structural regulation of carbon materials, by using a segmented activation process, mesopores and micropores are respectively constructed to form a better hierarchical pore structure, which is beneficial to the energy storage performance of supercapacitors. Compared with the random etching of the traditional method, the mesopore ratio is greatly increased.

[0105] Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A green activation method for producing coal-based supercapacitor carbon, characterized in that, It includes the following processes: Mix the coal-based carbonized material and the soluble carbonate evenly to obtain mixture A; Activate the mixture A in a protective atmosphere to obtain a pre-activated material; Activate the pre-activated material in a mixed atmosphere of a protective gas and carbon dioxide to obtain a deeply activated material; Wash the deeply activated material to remove the soluble carbonate in the deeply activated material, and then filter and dry it to obtain the coal-based supercapacitor carbon.

2. The green activation method for producing coal-based supercapacitor carbon according to claim 1, wherein, In mixture A, the mass ratio of the coal-based carbonized material to the soluble carbonate is 1:(1 - 0.2).

3. A green activation method for producing coal-based supercapacitor carbon according to claim 1 or 2, characterized in that, The soluble carbonate uses at least one of potassium carbonate and sodium carbonate.

4. A green activation method for producing coal-based supercapacitor carbon according to claim 1, characterized in that, When activating the mixture A in a protective atmosphere, the activation temperature is 700 - 900 °C, the activation time is 1 - 2 hours, and after heat preservation, it is cooled to obtain a pre-activated material.

5. A green activation method for producing coal-based supercapacitor carbon according to claim 1, characterized in that, When activating the pre-activated material in a mixed atmosphere of a protective gas and carbon dioxide, the activation temperature is 700 - 900 °C, the activation time is 1 - 2 hours, and after heat preservation, it is cooled to obtain a deeply activated material.

6. The green activation method for producing coal-based supercapacitor carbon according to claim 1, characterized in that, When activating the pre-activated material in a mixed atmosphere of a protective gas and carbon dioxide, the volume ratio of the protective gas to carbon dioxide is 1:(1 - 2).

7. A green activation method for producing coal-based supercapacitor carbon according to claim 1 or 6, characterized in that, The protective gas uses nitrogen or argon.

8. A green activation method for producing coal-based supercapacitor carbon according to claim 1, characterized in that, When activating the mixture A in a protective atmosphere, after heat preservation, switch the atmosphere to a mixed atmosphere of a protective gas and carbon dioxide to activate the pre-activated material.

9. A green activation method for producing coal-based supercapacitor carbon according to claim 1, characterized in that, After washing and filtering the deeply activated material, evaporate and recrystallize the obtained filtrate to precipitate the soluble carbonate, separate the precipitated soluble carbonate and dry it, and use the evaporated pure water to wash the deeply activated material.

10. A method for producing coal-based supercapacitor carbon, characterized in that, It is prepared by the green activation method according to any one of claims 1 - 9.

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