阅读说明：本技术 一种模板法制备双电层电容器活性炭的方法 (Method for preparing double electric layer capacitor activated carbon by template method ) 是由 王大志 李修强 于 2019-11-27 设计创作，主要内容包括：本申请涉及一种模板法制备双电层电容器活性炭的方法,包括：采用纳米碳酸盐作为模板剂,低软化点碳前驱体材料为碳源,金属氢氧化物为活化剂；将所述碳源、所述模板剂、所述活化剂置于同一反应容器中搅拌并固化,形成固化料；将所述固化料置于活化炉中进行活化,获得活化产物；采用浓酸对所述活化产物进行酸煮；对酸煮后的所述活化产物进行水洗至中性；对水洗后的所述活化产物进行过滤、烘干并破碎得到所述双电层电容器活性炭；其中,所述低软化点的取值范围为小于380℃。其有提高中孔含量及、增大比表面积、减少工序、节约时间、降低成本的作用。(The application relates to a method for preparing double electric layer capacitor activated carbon by a template method, which comprises the following steps: adopting nano carbonate as a template agent, a low-softening-point carbon precursor material as a carbon source and a metal hydroxide as an activating agent; placing the carbon source, the template agent and the activating agent in the same reaction vessel, stirring and curing to form a curing material; putting the curing material into an activation furnace for activation to obtain an activated product; acid cooking is carried out on the activated product by adopting concentrated acid; washing the activated product after acid cooking with water to be neutral; filtering, drying and crushing the activated product after washing to obtain the double electric layer capacitor activated carbon; wherein the value range of the low softening point is less than 380 ℃. It has the functions of raising mesopore content, increasing specific surface area, reducing working procedure, saving time and reducing cost.)

1. A method for preparing double electric layer capacitor activated carbon by a template method is characterized by comprising the following steps: the method comprises the following steps: adopting nano carbonate as a template agent, a low-softening-point carbon precursor material as a carbon source and a metal hydroxide as an activating agent;

placing the carbon source, the template agent and the activating agent in the same reaction vessel, stirring and curing to form a curing material;

putting the curing material into an activation furnace for activation to obtain an activated product;

acid cooking is carried out on the activated product by adopting concentrated acid;

washing the activated product after acid cooking with water to be neutral;

filtering, drying and crushing the activated product after washing to obtain the double electric layer capacitor activated carbon;

wherein the value range of the low softening point is less than 380 ℃.

2. The method for preparing the electric double layer capacitor activated carbon by the template method according to claim 1, characterized in that: placing the carbon source, the template agent and the activating agent in the same reaction vessel, stirring and curing to form a curing material, comprising:

placing the carbon source in the reaction vessel, and heating until the carbon source is molten;

stirring the molten carbon source, and adding the template agent in the stirring process to uniformly mix the carbon source and the template agent;

adding the activating agent in the stirring process, and raising the heating temperature of the reaction vessel to a first set temperature so that the carbon source and the activating agent are molten and surround the template agent particles;

controlling the heating temperature of the reaction vessel to rise to a second set temperature so as to cure the carbon source and the activator to form the cured material;

wherein, the reaction vessel is a reaction kettle with a stirrer.

3. The method for preparing the electric double layer capacitor activated carbon by the template method according to claim 2, characterized in that: the first set temperature is 380 ℃;

the second set temperature is greater than or equal to 450 ℃;

and adding the activating agent for multiple times in the stirring process, wherein the activating agent is gradually added into the reaction vessel according to a preset speed.

4. The method for preparing the electric double layer capacitor activated carbon by the template method according to claim 3, characterized in that: the second set temperature is greater than or equal to 480 ℃.

5. The method for preparing the electric double layer capacitor activated carbon by the template method according to claim 1, characterized in that: placing the solidified material in the activation furnace for activation to obtain the activated product, wherein the activation product comprises:

placing the solidified material in an activation furnace, and introducing inert gas into the activation furnace;

controlling the temperature of the activation furnace to rise to the activation temperature at a first temperature rise rate and then keeping the temperature for a first preset time;

when the temperature of the activation furnace is controlled to be reduced from the activation temperature to the third set temperature, taking out the activated cured material from the activation furnace to obtain the activated product;

wherein, when the activated condensate is taken out from the activation furnace, the method also comprises the step of sprinkling water, reducing the temperature and dissolving the activated condensate.

6. The method for preparing the electric double layer capacitor activated carbon by the template method according to claim 5, characterized in that: the activation temperature is 750-850 ℃, and the heat preservation time is 1.5-3 hours; the value range of the third set temperature is as follows: 450-550 ℃.

7. The method for preparing an electric double layer capacitor activated carbon according to the template method of claim 5 or 6, characterized in that: the inert gas is nitrogen;

the first heating rate is 5 ℃/min, the activation temperature is 800 ℃, the heat preservation time is 2 hours, and the third set temperature is 500 ℃.

8. The method for preparing the electric double layer capacitor activated carbon by the template method according to claim 1, characterized in that: the weight ratio of the carbon source to the activator is greater than or equal to 1: 0.9, and less than or equal to 1: 1.5;

the weight ratio of the carbon source to the template is greater than or equal to 1: 0.2, and less than or equal to 1: 0.4.

9. the method for preparing the electric double layer capacitor activated carbon by the template method according to claim 8, characterized in that: the weight ratio of the carbon source to the activator is 1: 1.2;

the weight ratio of the carbon source to the template agent is 1: 0.3.

10. the method for preparing the electric double layer capacitor activated carbon by the template method according to claim 1, characterized in that: the template agent comprises at least one of calcium carbonate, magnesium carbonate, calcium chloride, calcium hydroxide, magnesium citrate and silicon dioxide;

the activating agent comprises at least one of potassium hydroxide, sodium hydroxide, potassium carbonate and zinc chloride;

the carbon source comprises at least one of emulsified asphalt, phenolic resin, furfural resin, sugar and cellulose.

Technical Field

The disclosure relates to the field of carbon electric material preparation, in particular to a method for preparing double electric layer capacitor activated carbon by a template method.

Background

The prior template method for preparing the electrode material active carbon has the disadvantages of complex process, long time, low efficiency and high cost, particularly, a carbonization process, because the process is in a closed furnace, the temperature rising rate needs to be strictly controlled, if the temperature rising rate is high, the carbon material is heated violently and expands after being melted, molten liquid overflows from a container and flows into the furnace, so that a large amount of material loss or even complete loss is caused, and if the temperature rising rate is low, the problem of long solidification time is caused, so the temperature which is required to be matched with the carbon precursor material for melting and expanding but not overflowing is difficult to control, and the melting package depends on the flow of the carbon precursor melt, so the viscosity is large, the mixing uniformity is poor, and the mixing filling degree is greatly deficient. The carbonized material after washing out the template needs to be further activated to improve the specific surface area, and the intermediate carbon material needs to be mixed with an alkali metal activator and then put into a furnace for activation. At this stage, the activator will be heated and melted, and will repeat once again like the first melting and solidifying process, for example, the potassium hydroxide activator will expand more than when being heated and melted in the carbonization process, and because of the reaction, gas will be generated, and the phenomenon of overflowing will occur. The overflow substance can seriously corrode the furnace wall and the furnace body of the heating furnace at high temperature, in addition, the actual activating agent is reduced due to the overflow, the materials are not uniformly mixed, and the quality of the activated electrode material, namely the activated carbon, prepared by activation is not good enough.

Disclosure of Invention

In view of the above, the present disclosure provides a method for preparing an electric double layer capacitor activated carbon by a template method, which has the effects of increasing the mesopore content and the specific surface area, reducing the process, saving time, and reducing the cost.

According to an aspect of the present disclosure, there is provided a method for preparing an electric double layer capacitor activated carbon by a template method, including: adopting nano carbonate as a template agent, a low-softening-point carbon precursor material as a carbon source and a metal hydroxide as an activating agent;

placing the carbon source, the template agent and the activating agent in the same reaction vessel, stirring and curing to form a curing material;

putting the curing material into an activation furnace for activation to obtain an activated product;

acid cooking is carried out on the activated product by adopting concentrated acid;

washing the activated product after acid cooking with water to be neutral;

filtering, drying and crushing the activated product after washing to obtain the double electric layer capacitor activated carbon;

wherein the value range of the low softening point is less than 380 ℃.

In one possible implementation manner, the carbon source, the template and the activator are placed in the same reaction vessel to be stirred and solidified to form a solidified material, and the solidified material comprises:

placing the carbon source in the reaction vessel, and heating until the carbon source is molten;

stirring the molten carbon source, and adding the template agent in the stirring process to uniformly mix the carbon source and the template agent;

adding the activating agent in the stirring process, and raising the heating temperature of the reaction vessel to a first set temperature so that the carbon source and the activating agent are molten and surround the template agent particles;

controlling the heating temperature of the reaction vessel to rise to a second set temperature so as to cure the carbon source and the activator to form the cured material;

wherein, the reaction vessel is a reaction kettle with a stirrer.

In one possible implementation, the first set temperature is 380 ℃;

the second set temperature is greater than or equal to 450 ℃;

wherein, when the activating agent is added for a plurality of times in the stirring process, the activating agent is gradually added into the reaction vessel according to a preset speed.

In one possible implementation, the second set temperature is greater than or equal to 480 ℃.

In one possible implementation manner, the curing material is placed in the activation furnace for activation, and the activation product is obtained, and the method includes:

placing the solidified material in an activation furnace, and introducing inert gas into the activation furnace;

controlling the temperature of the activation furnace to rise to the activation temperature at a first temperature rise rate and then keeping the temperature for a first preset time;

when the temperature of the activation furnace is controlled to be reduced from the activation temperature to the third set temperature, taking out the activated cured material from the activation furnace to obtain the activated product;

wherein, when the activated condensate is taken out from the activation furnace, the method also comprises the step of sprinkling water, reducing the temperature and dissolving the activated condensate.

In one possible implementation, the activation temperature is between 750 ℃ and 850 ℃, and the holding time is between 1.5 hours and 3 hours; the value range of the third set temperature is as follows: 450-550 ℃.

In one possible implementation, the inert gas is nitrogen;

the first heating rate is 5 ℃/min, the activation temperature is 800 ℃, the heat preservation time is 2 hours, and the third set temperature is 500 ℃.

In one possible implementation, the weight ratio of the carbon source to the activator is greater than or equal to 1: 0.9, and less than or equal to 1: 1.5;

the weight ratio of the carbon source to the template is greater than or equal to 1: 0.2, and less than or equal to 1: 0.4.

in one possible implementation, the weight ratio of the carbon source to the activator is 1: 1.2;

the weight ratio of the carbon source to the template agent is 1: 0.3.

in one possible implementation, the templating agent includes at least one of calcium carbonate, magnesium carbonate, calcium chloride, calcium hydroxide, magnesium citrate, and silica;

the activating agent comprises at least one of potassium hydroxide, sodium hydroxide, potassium carbonate and zinc chloride;

the carbon source comprises at least one of emulsified asphalt, phenolic resin, furfural resin, sugar and cellulose.

The method for preparing the double electric layer capacitor activated carbon by the template method removes a plurality of working procedures in the original template method, and reduces the curing working procedure and the carbonization working procedure in the former template forming processWorker's toolThe process comprises a carbonized material grinding process, an acid boiling and water washing process and a carbonized material drying process, wherein the reduction of the processes can shorten the time by at least five times. And the curing in the furnace is changed into the curing outside the furnace, the nano carbonate template, the carbon precursor material carbon source with low softening point and the metal hydroxide activating agent are filled into the reaction container for stirring and curing, the overflowing is avoided by stirring, the boiling degree of the molten mass is easy to control, the curing speed can be flexibly controlled according to the curing condition of the materials in the reaction container, the curing time is saved, and the curing is only once in the reaction container, so that the time can be saved by more than three times compared with the previous mode. In addition, in the solidification process, the molten materials are continuously stirred, the materials are mixed uniformly, and meanwhile, the metal hydroxide activator is fully used, so that the total using amount of the metal hydroxide activator is reduced. The method for preparing the double-electric-layer capacitor activated carbon by the template method comprises the steps of directly feeding a curing material into an activation furnace for activation, fully carbonizing a carbon precursor material of a wrapping layer along with the rise of temperature of a primary condensation carbon material wrapped by a nano-particle template agent to form a carbon skeleton, continuously raising the temperature to the activation temperature, enabling alkali metal steam decomposed by an activating agent not to enter pores occupied by the template agent and only to act on the wrapping layer (carbon wall) outside the template agent, etching the wrapping layer (carbon wall) to increase micropores, mixing the rest part of carbon material and the activating agent uniformly when the rest part of carbon material and the activating agent are cured, and generating a large amount of pores in the activation process. The electrode material active carbon prepared by the method for preparing the double electric layer capacitor active carbon by the template method in the embodiment of the disclosure has more reasonable pore size distribution, and the pore size is mostly distributed between 0.5nm and 4 nm.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 illustrates a process flow diagram of a method of preparing an electric double layer capacitor activated carbon by a templating method according to an embodiment of the present disclosure;

fig. 2 shows constant current charge and discharge curves for the first, second and third 3000 times in the embodiments of the present disclosure;

fig. 3 shows graphs of specific capacitance retention ratios of the first, second, and third embodiments of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

Fig. 1 illustrates a process flow diagram of a method for preparing an electric double layer capacitor activated carbon according to an embodiment of the present disclosure by a templating method. As shown in FIG. 1, the method for preparing the double-electric-layer capacitor activated carbon by the template method sequentially comprises the steps of S100, curing outside the furnace, S200, activating, S300, acid boiling, S400, washing, S500, filtering, S600, drying and S700, and crushing to obtain the double-electric-layer capacitor activated carbon. The method adopts nano carbonate as a template agent, a low-softening-point carbon precursor material as a carbon source and metal hydroxide as an activating agent. S100, curing outside the furnace, including: and placing the carbon source of the low-softening-point carbon precursor material, the nano carbonate and the metal hydroxide activating agent into the same reaction container, stirring and curing to form a curing material. S200, activating comprises: and directly placing the curing material in an activation furnace to activate the curing material, and obtaining an activated product. S300, acid cooking comprises: acid with high concentration is adopted to carry out acid boiling on the activated product, so as to degrade the nano carbonate template and remove the nano carbonate template. S400, washing with water comprises: and washing the activated product after acid boiling until the pH value of the activated product is in a neutral position. And finally, carrying out S500, filtering, S600, drying and S700 on the neutral activated product, and crushing to obtain the double electric layer capacitor activated carbon. Here, it should be noted that, at S300, the acid cooking time at the acid cooking may be set to two hours.

The method for preparing the double-electric-layer capacitor activated carbon by the template method disclosed by the embodiment of the disclosure removes a plurality of working procedures in the original template method, namely, a curing working procedure, a carbonization working procedure, a carbonized material grinding working procedure, an acid boiling water washing working procedure and a carbonized material drying working procedure in the former template forming process are reduced, and the reduction of the working procedures can shorten the time by at least five times. And the curing in the furnace is changed into the curing outside the furnace, the nano carbonate template, the carbon precursor material carbon source with low softening point and the metal hydroxide activating agent are filled into the reaction container for stirring and curing, the overflowing is avoided by stirring, the boiling degree of the molten mass is easy to control, the curing speed can be flexibly controlled according to the curing condition of the materials in the reaction container, the curing time is saved, and the curing is only once in the reaction container, so that the time can be saved by more than three times compared with the previous mode. In addition, in the solidification process, the molten materials are continuously stirred, the materials are mixed uniformly, and meanwhile, the metal hydroxide activator is fully used, so that the total using amount of the metal hydroxide activator is reduced. The method for preparing the double-electric-layer capacitor activated carbon by the template method comprises the steps of directly feeding a curing material into an activation furnace for activation, fully carbonizing a carbon precursor material of a wrapping layer along with the rise of temperature of a primary condensation carbon material wrapped by a nano-particle template agent to form a carbon skeleton, continuously raising the temperature to the activation temperature, enabling alkali metal steam decomposed by an activating agent not to enter pores occupied by the template agent and only to act on the wrapping layer (carbon wall) outside the template agent, etching the wrapping layer (carbon wall) to increase micropores, mixing the rest part of carbon material and the activating agent uniformly during curing, and generating a large number of pores during activation. The electrode material active carbon prepared by the method for preparing the double electric layer capacitor active carbon by the template method in the embodiment of the disclosure has more reasonable pore size distribution, and the pore size is mostly distributed between 0.5nm and 4 nm.

In summary, the method for preparing the double electric layer capacitor activated carbon by the template method in the embodiment of the disclosure enables the nano carbonate template, the metal hydroxide activator and the carbon source of the low-softening-point carbon precursor material to be fully mixed, and fully separated and wrapped, the nano carbonate template and the metal hydroxide activator are used in a small amount, the electrode material activated carbon has high mesopore content and large specific surface area, the process amount is greatly reduced, the time is saved, the efficiency is improved, and the cost is reduced.

In one possible implementation manner, the nano-carbonate template, the metal hydroxide activator and the low-softening-point carbon precursor material carbon source are placed in the same reaction vessel to be stirred and cured to form a cured material, which includes: firstly, placing a carbon source of a carbon precursor material with a low softening point in a reaction container, heating until the carbon source of the carbon precursor material with the low softening point is molten, starting stirring, then adding a nano carbonate template agent, and fully stirring to ensure that the carbon source and the nano carbonate template agent are uniform; adding a metal hydroxide activator under the stirring state, continuously heating to a first set temperature at which the metal hydroxide activator is molten, keeping the temperature for twenty minutes to one hour to fully separate the molten carbon material and the metal hydroxide activator mixed solution and wrap solid carbonate particles, continuously heating to a second set temperature, gradually polycondensing the molten material into clusters, wherein the higher the temperature is, the more the reaction products of the hydroxide and the carbon are, and H is generated after the temperature reaches the second set temperature₂O, CO and CO₂Etc. the volatile components of the carbon precursor material are violently decomposed, oxides and CO₂And (3) generating carbonate under the action, wherein the molten material becomes thick and gradually solidifies to form a solidified material.

Here, it should be noted that the low softening point carbon precursor material carbon source is in a molten state at a temperature of greater than or equal to 350 ℃ and less than or equal to 380 ℃.

Because the metal hydroxide activating agent is added under the condition that the carbon source of the low-softening-point carbon precursor material and the nano carbonate template are uniformly stirred, the carbonization step of the original template method is not carried out, the mesopores are prevented from being etched when the early mesopore carbonized material and the metal hydroxide are reactivated, the pore wall of the pore becomes thin, the mesopores are merged into macropores due to the collapse of the pore wall, and more mesopores can be reserved.

And, still further, in one possible implementation, the reaction vessel is a reaction kettle with an agitator. In the boiling and curing process, the melted materials are continuously stirred by the reaction kettle with the stirrer, the materials are mixed uniformly, the activating agent is fully used, and the total dosage is less. And the reaction kettle with the stirrer can watch the curing degree more easily, and the reaction kettle is provided with the stirrer, so that the control is more flexible, and the curing speed is further improved.

In one possible implementation, the first set temperature is 380 ℃ and the second set temperature is 450 ℃, that is: when the metal hydroxide activator is added under the stirring state, the temperature is firstly raised to 380 ℃, so that the metal hydroxide activator is in a molten state, and the temperature is continuously raised to more than 450 ℃ to form a solidified material. Further, in a possible implementation, the second set temperature is preferably above 480 ℃.

Wherein, it is also pointed out that, when the activating agent is added in the stirring process, the activating agent can be added into the reaction vessel for a plurality of times, and when the activating agent is added, the activating agent can be gradually added into the reaction vessel according to a preset rate, so that the activating agent is mixed with the molten carbon source. The preset rate can be flexibly controlled according to actual conditions, such as: the activator was divided equally into 5 portions, one for each addition, with 5 minute intervals. By adopting the mode of gradually adding the activating agent under the stirring state, the activating agent and the molten carbon source are mixed more uniformly and fully.

In one possible implementation, the curing material is placed in an activation furnace for activation to obtain an activated product, including: and placing the curing material in the activation furnace, introducing inert gas into the activation furnace, heating the activation furnace to the activation temperature at a first heating rate, and keeping the activation temperature for a first preset time. And (3) controlling the temperature of the activation furnace to naturally fall to a third set temperature along with the furnace from the activation temperature, and taking out the activated cured substance from the activation furnace to obtain an activated product. Wherein, when the activated condensate is taken out from the activation furnace, the method also comprises the step of spraying water, reducing the temperature and dissolving the activated condensate.

Further, in one possible implementation, the activation temperature is from 760 ℃ to 800 ℃ and the holding time is from 1.5 hours to 3 hours. Further, in one possible implementation, the rare gas is nitrogen, the first temperature rise rate is 5 ℃/min, the activation temperature is 800 ℃, the holding time is 2 hours, and the third set temperature is 500 ℃.

Namely: when activation is carried out in activation, nitrogen is introduced as protective gas, the temperature in the activation furnace is raised to 800 ℃ at a first temperature rise rate of 5 ℃/min, heat preservation is carried out for two hours at 800 ℃, when the temperature of an activated substance is reduced to 500 ℃, the activated product is quickly taken out, and the activated product is sprayed with water, cooled and dissolved.

In one possible implementation, the weight ratio of the low softening point carbon precursor material carbon source to the metal hydroxide is greater than or equal to 1: 0.9, and less than or equal to 1: 1.5.

further, in one possible implementation, the ratio of the low softening point carbon precursor material carbon source to the metal hydroxide is 1: 1.2.

in one possible implementation, the weight ratio of the low softening point carbon precursor material carbon source to the nano-acid salt is greater than or equal to 1: 0.2, and less than or equal to 1: 0.4.

further, in one possible implementation, the ratio of the low softening point carbon precursor material carbon source to the nano-acid salt is 1: 0.3.

in one possible implementation, the nanocarbonate may be at least one of calcium carbonate, magnesium carbonate, calcium chloride, calcium hydroxide, magnesium citrate, and a material in which silica may be acid-hydrolyzed. Here, it should also be noted that the low softening point carbon precursor material carbon source may be at least one of emulsified pitch, phenolic resin, furfural resin, sugar, cellulose carbonaceous material. Here, it should also be noted that the metal hydroxide may be at least one of potassium hydroxide, sodium hydroxide, potassium carbonate, zinc chloride, and it is preferable to use potassium hydroxide as an activator.

In conclusion, nanometer carbonate is taken as a template agent, a carbon source of a low-softening-point carbon precursor material is taken as a carbon source, alkali metal hydroxide is taken as an activating agent, the nanometer carbonate, the carbon source of the low-softening-point carbon precursor material and the activating agent are sequentially added into a heating reaction kettle provided with a stirrer to be fully mixed and melted, the template agent is wrapped by the carbon source of the low-softening-point carbon precursor material and then mixed and reacted with the melting activating agent, the mixture is continuously decocted to be solidified, and then the mixture is; and finally, carrying out post-treatment cleaning. The prepared activated carbon for the double-electric-layer capacitor has the specific surface area of 2091-2356m2/g, the mesopore volume accounting for 51.65-61.93% of the total pore volume, the average pore diameter of 2.38-2.51nm and a large effective pore proportion, and the electrode is made of the activated carbon material to assemble the double-electric-layer capacitor, wherein under the condition of adopting an organic electrolyte, the specific capacitance reaches 167.6F/g, and after 3000 times of charge-discharge cycles, the specific capacitance is 160.9F/g, and the retention rate is 96%. The double electric layer capacitor prepared by the activated carbon has high capacity, stable performance and low cyclic attenuation.