A high-nitrogen-doped multi-level-pore carbon material suitable for wind power station energy storage, a preparation method and application thereof

Abstract

This invention belongs to the field of new energy materials and electrochemical energy storage technology, specifically relating to a high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage, its preparation method, and its application. The preparation method includes the following steps: dissolving 2,6-diaminopyridine and zinc chloride in deionized water to form Zn... 2+ A coordination polymer with 2,6-diaminopyridine was formed; subsequently, an auxiliary nitrogen source was added to obtain a gel-like precursor; the gel-like precursor was placed in an inert atmosphere and heated to 500-800℃ to form a nitrogen-doped polymer framework, yielding a pre-carbonized product; the pre-carbonized product was ground into powder and activated and pore-forming in an inert atmosphere at 900℃; after natural cooling, residual zinc species were removed by acid washing, the powder was washed until neutral, and then vacuum dried to obtain a highly nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage. This method solves the problems of precise control of high nitrogen doping and highly active nitrogen configuration, and the lack of a single pore structure in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of new energy materials and electrochemical energy storage technology, specifically relating to a high-nitrogen-doped multi-level porous carbon material suitable for wind farm energy storage, its preparation method and application. Background Technology

[0002] With the global energy structure transitioning towards cleaner energy, wind power has become a core pillar of the renewable energy sector, and the installed capacity of wind farms continues to expand. However, the inherent intermittent and fluctuating characteristics of wind power lead to unstable power output, severely impacting grid acceptance capacity and the operational reliability of wind farms. Therefore, improving the performance of wind farm energy storage systems has become a pressing technical challenge. Supercapacitors, with their high power density, millisecond-level rapid charge and discharge capabilities, and ultra-long cycle life, can effectively mitigate wind power fluctuations, provide emergency energy storage for wind turbine pitch control systems, and support grid frequency regulation and peak shaving. They are core components suitable for the energy storage needs of wind farms. The energy storage performance of supercapacitors hinges on the electrode materials. Nitrogen-doped carbon materials, by introducing pseudocapacitance, can significantly improve the specific capacitance and surface wettability of electrode materials, optimizing the power output stability and cycle durability of supercapacitors. This precisely matches the core requirement of wind farm energy storage for long-term reliable operation of devices, and has become a research hotspot for supercapacitor electrode materials used in wind farm energy storage.

[0003] The complex operating environment of wind farms (especially offshore and high-altitude, extremely cold regions) places stringent requirements on the electrode materials of supercapacitors used for energy storage: they must possess a high specific surface area to ensure energy storage capacity and meet the instantaneous charging and discharging needs during wind power fluctuations; they must possess excellent ion transport efficiency and electrochemical activity to achieve rapid power response; they must possess good wide-temperature adaptability to resist performance degradation caused by large diurnal temperature differences and extreme weather (low temperature, high humidity, high salt spray); and they must possess ultra-long cycle life to reduce the operation and maintenance costs of wind farms. Although traditional porous carbon materials have the advantage of high specific surface area, their pore structure is mainly micropores, resulting in high ion transport resistance in the electrolyte and limited rate performance, making it unable to quickly respond to the instantaneous power regulation needs of wind power; moreover, they are chemically inert, have a single surface functional group, and poor electrochemical activity, with significant performance degradation under extreme temperature ranges, making them unsuitable for the harsh energy storage conditions of wind farms. To address the aforementioned technical deficiencies, heteroatom doping has been proven to be an effective improvement strategy. Nitrogen atoms, with atomic radii similar to carbon atoms, are less likely to cause severe lattice distortion when incorporated into the carbon framework. Furthermore, their lone pair electrons can alter the electron cloud density of carbon materials, creating more electrochemically active sites. This enhances the material's conductivity and pseudocapacitive contribution, thereby improving the supercapacitor's charge-discharge rate, cycle stability, and wide-temperature adaptability, thus meeting the practical application requirements of wind farm energy storage.

[0004] Currently, the preparation methods for nitrogen-doped carbon materials are mainly divided into one-step and two-step methods. Both methods have significant technical limitations when applied to the preparation of electrode materials for supercapacitors used in wind farm energy storage. The one-step method involves directly mixing carbon precursors, nitrogen-containing substances, and chemical activators, followed by high-temperature pyrolysis. This process is simple, low-cost, and has the potential for large-scale preparation. However, the violent reaction at high temperatures easily leads to the volatilization of a large amount of nitrogen, resulting in a low nitrogen content in the product. Furthermore, the pore size distribution is difficult to control precisely, failing to meet the core requirements of high pseudocapacitance and high ion transport efficiency for electrode materials in wind farm energy storage. The two-step method first carbonizes the carbon precursor and then introduces a nitrogen source. Although this can retain nitrogen to a certain extent and increase the nitrogen doping amount, the subsequent nitrogen doping process easily damages the already formed carbon skeleton, leading to a decrease in the specific surface area of ​​the material and affecting the energy storage capacity. This makes it difficult to adapt to the needs of high-power, long-term stable energy storage in wind farms.

[0005] Regardless of whether biomass or synthetic polymers are used as the carbon source, existing preparation technologies struggle to achieve the ideal balance between high specific surface area and high nitrogen content in nitrogen-doped carbon materials. This balance is a core performance indicator for supercapacitor electrode materials used in wind farm energy storage—high specific surface area ensures energy storage capacity, while high nitrogen content enhances electrochemical activity and cycle stability; both are indispensable. Furthermore, most existing preparation methods rely on corrosive activators such as strong acids and alkalis, which not only impose stringent requirements on production equipment and increase preparation costs but also generate severe environmental pollution. This contradicts the construction philosophy of wind farms and does not meet the environmental protection requirements of offshore wind farms.

[0006] The upgrading of wind farm energy storage technology urgently requires high-performance, green and environmentally friendly electrode materials as support. Therefore, it is necessary to develop a new method for preparing nitrogen-doped carbon materials that is green, efficient, and can simultaneously achieve high nitrogen doping and controllable multi-level porous structure. Summary of the Invention

[0007] The purpose of this invention is to provide a high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage, its preparation method, and its application, addressing the following shortcomings in existing nitrogen-doped carbon material preparation technologies: First, nitrogen is easily volatilized in large quantities during high-temperature pyrolysis, making it difficult to precisely control the configuration of high nitrogen doping and high-activity nitrogen; second, the pore structure is singular, making it difficult to simultaneously construct a hierarchical porous structure that combines micropores, mesopores, and macropores, thus failing to balance high specific surface area and rapid ion transport performance; third, the preparation process relies on highly corrosive and alkaline reagents, resulting in significant environmental pressure, high equipment requirements, and complex processes that are difficult to scale up; fourth, the prepared carbon material, as an electrode material for supercapacitors, cannot simultaneously achieve high specific capacity, excellent rate performance, and long-cycle stability.

[0008] This invention is achieved through the following technical solution: This invention discloses a method for preparing high-nitrogen-doped hierarchical porous carbon materials suitable for wind farm energy storage, comprising the following steps: S1. Dissolve 2,6-diaminopyridine and zinc chloride in deionized water, stir and react to form Zn. 2+ The coordination polymer with 2,6-diaminopyridine was then added, and stirring was continued to obtain a gel-like precursor. S2. Place the gel-like precursor in an inert atmosphere, heat it to 500~800℃, and keep it at that temperature for 1~3 hours to allow 2,6-diaminopyridine to undergo a condensation reaction with the auxiliary nitrogen source to form a preliminary cross-linked nitrogen-doped polymer backbone, thus obtaining a pre-carbonized product. S3. Grind the pre-carbonized product into powder, place it in an inert atmosphere, heat it to 900℃, and keep it at that temperature for 60~120 minutes to activate and create pores. After naturally cooling to room temperature, remove residual zinc species by acid washing, wash with deionized water until the filtrate is neutral, and vacuum dry to obtain a high-nitrogen-doped multi-level porous carbon material suitable for wind farm energy storage.

[0009] Furthermore, in S1, the stirring reaction is carried out at 60~90°C for 4~8 hours.

[0010] Furthermore, in S1, the auxiliary nitrogen source is melamine or urea.

[0011] Furthermore, in S1, when 2,6-diaminopyridine and zinc chloride are dissolved in deionized water, graphene oxide is added as a conductive framework to make Zn 2+ The coordination polymer with 2,6-diaminopyridine was self-assembled in situ on the surface of graphene oxide.

[0012] Furthermore, in S2, the inert atmosphere is an argon atmosphere or a nitrogen atmosphere, the pre-carbonization heating rate is 3℃ / min, the temperature is raised to 500~800℃, and held for 1.5~2 hours.

[0013] Furthermore, in S3, the inert atmosphere is an argon atmosphere, and the activation heating rate is 3~8℃ / min.

[0014] Furthermore, in S3, the pickling is performed using hydrochloric acid solution, and the vacuum drying temperature is 60~120℃, with a drying time of 8~24 hours.

[0015] The present invention also discloses a high-nitrogen-doped hierarchical porous carbon material suitable for energy storage in wind farms, which is prepared by the aforementioned method.

[0016] Furthermore, the high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage has a hierarchical porous structure with micropores, mesopores, and macropores distributed in a hierarchical manner, and the nitrogen element doped in the carbon framework mainly exists in the form of pyridine nitrogen and pyrrole nitrogen with high electrochemical activity.

[0017] The present invention also discloses a supercapacitor comprising the aforementioned high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage as the electrode active material.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a method for preparing high-nitrogen-doped hierarchical porous carbon materials suitable for wind farm energy storage. The method uses 2,6-diaminopyridine as the core carbon-nitrogen precursor, whose molecule contains a rigid pyridine ring and a highly active amino group. This material is prepared by reacting with Zn... 2+ The coordination effect forms a molecularly dispersed coordination polymer, achieving uniform distribution and pre-fixation of the nitrogen source at the molecular level. Combined with the low-temperature pre-carbonization step, 2,6-diaminopyridine and the auxiliary nitrogen source fully condense to form a highly cross-linked polymer skeleton, which significantly inhibits the loss of nitrogen during high-temperature activation. At the same time, the bonding configuration of nitrogen in the carbon skeleton can be precisely controlled by adjusting the process parameters, which greatly increases the proportion of highly active nitrogen species and provides abundant pseudocapacitive active sites for electrochemical reactions, fundamentally improving the specific capacity of the material.

[0019] This invention innovatively employs zinc chloride as a synergistic template agent and a mild activator, achieving hierarchical pore structure construction suitable for electrochemical energy storage through a hierarchical process: the nanoscale coordination structure formed in the coordination polymerization step provides confined sites for micropore formation; the pre-carbonization step forms a stable cross-linked framework to prevent pore collapse; and the gas generated by the decomposition of zinc chloride in the high-temperature activation step escapes in situ to create pores, simultaneously constructing a hierarchical pore structure of micropores, mesopores, and macropores. By adjusting process parameters, the pore structure distribution can be precisely controlled, achieving full exposure of active sites through micropores and constructing continuous electrolyte ion transport channels through mesopores and macropores, significantly reducing ion transport resistance and solving the problem of traditional porous carbon materials being unable to simultaneously achieve high specific capacity and high rate performance. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0021] The detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0023] Example 1 This embodiment discloses a method for preparing a high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage. The specific steps are as follows: S1. Preparation of precursor polymer: 5.0 g of 2,6-diaminopyridine and 3.0 g of zinc chloride were dissolved in 40 mL of deionized water and reacted in an 80 °C water bath for 6 hours with stirring to form Zn. 2+ The coordination polymer with 2,6-diaminopyridine was then added; subsequently, 1.0 g of melamine was added as an auxiliary nitrogen source, and stirring was continued for 2 hours to obtain a white gel-like precursor. S2. Low-temperature pre-carbonization: The above-mentioned gel-like precursor is placed in a tube furnace and heated to 500°C at a heating rate of 3°C / min under the protection of a high-purity argon atmosphere. The temperature is held for 1.5 hours to allow 2,6-diaminopyridine to undergo a polycondensation reaction with melamine to form a preliminary cross-linked nitrogen-doped polymer skeleton, thus obtaining the pre-carbonized product. S3. High-temperature activation and pore control: After grinding the pre-carbonized product into a uniform powder, it was placed in a tube furnace and heated to 900℃ at a heating rate of 5℃ / min under the protection of high-purity argon atmosphere. The temperature was held for 60 minutes to activate and create pores. After naturally cooling to room temperature, residual zinc species were removed by washing with 1mol / L dilute hydrochloric acid, and then washed with deionized water until the filtrate was neutral. The filtrate was then dried in an 80℃ vacuum drying oven for 12 hours to obtain a high-nitrogen-doped multi-level porous carbon material suitable for wind farm energy storage.

[0024] Example 2 The only difference between this embodiment and Example 1 is that in S1, the amount of zinc chloride added is adjusted to 6.0g, and the reaction is carried out by stirring in a 60°C water bath for 8 hours. The remaining steps and process parameters are exactly the same as in Example 1.

[0025] Example 3 The only difference between this embodiment and Example 1 is that in S1, when dissolving 2,6-diaminopyridine and zinc chloride, an additional 0.3g of graphene oxide is added as a conductive framework, and the mixture is ultrasonically dispersed evenly before being stirred in a water bath. The remaining steps and process parameters are exactly the same as in Example 1.

[0026] Example 4 The only difference between this embodiment and Example 1 is that in S1, the auxiliary nitrogen source is replaced with an equal mass of urea, and the reaction is carried out in a 90°C water bath with stirring for 4 hours; in S2, the pre-carbonization temperature is adjusted to 800°C, and the holding time is adjusted to 1 hour. The remaining steps and process parameters are exactly the same as in Example 1.

[0027] Example 5 The only difference between this embodiment and Embodiment 1 is that in S1, the auxiliary nitrogen source is replaced with an equal mass of urea, and in S2, the pre-carbonization temperature is adjusted to 600℃ and the holding time is adjusted to 3 hours. The remaining steps and process parameters are exactly the same as in Embodiment 1.

[0028] Example 6 The only difference between this embodiment and embodiment 1 is that in S3, the temperature is increased to 900°C at a heating rate of 3°C / min, the activation holding time is adjusted to 90 minutes, and the product is dried in a vacuum drying oven at 120°C for 8 hours. All other steps and process parameters are exactly the same as in embodiment 1.

[0029] Example 7 The only difference between this embodiment and embodiment 1 is that in S3, the temperature is increased to 900°C at a heating rate of 8°C / min, the activation holding time is adjusted to 120 minutes, and the product is dried in a vacuum drying oven at 60°C for 24 hours. All other steps and process parameters are exactly the same as in embodiment 1.

[0030] Comparative Example 1 This comparative example is a prior art control group. The difference from Example 1 is that 2,6-diaminopyridine is replaced with an equal mass of guanine, and the addition of zinc chloride is omitted. Guanine is directly carbonized at 800°C for 2 hours under an argon atmosphere to obtain a carbonized product. The carbonized product is then mixed with KOH at a mass ratio of 1:2 and activated at 800°C for 1 hour under an argon atmosphere. The remaining post-processing steps are exactly the same as in Example 1.

[0031] Comparative Example 2 The difference between this comparative example and Example 1 is that 2,6-diaminopyridine is replaced with an equal mass of guanine, while the remaining steps and process parameters are exactly the same as in Example 1.

[0032] Comparative Example 3 The difference between this comparative example and Example 1 is that zinc chloride is not added in S1, while the remaining steps and process parameters are exactly the same as in Example 1.

[0033] Comparative Example 4 The difference between this comparative example and Example 1 is that no auxiliary nitrogen source, melamine, is added in S1, while the remaining steps and process parameters are exactly the same as in Example 1.

[0034] Comparative Example 5 The difference between this comparative example and Example 1 is that the low-temperature pre-carbonization step S2 is omitted, and the gel-like precursor prepared in S1 is directly heated to 900°C at a heating rate of 5°C / min and held at that temperature for 60 minutes. The remaining post-processing steps are exactly the same as in Example 1.

[0035] Test method: The prepared carbon material was used as the working electrode, the platinum sheet electrode as the counter electrode, the Hg / HgO electrode as the reference electrode, and the 6 mol / L KOH aqueous solution as the electrolyte. The tests were conducted using an electrochemical workstation.

[0036] Preparation of working electrode: The carbon material to be tested, conductive agent SuperP, and binder polyvinylidene fluoride (PVDF) were mixed at a mass ratio of 85:10:5. N-methylpyrrolidone (NMP) was added and stirred until a uniform slurry was formed. The slurry was uniformly coated on a 1cm×1cm nickel foam current collector and dried in a vacuum drying oven at 60℃ for 12 hours. After being pressed into a tablet by a tablet press, the working electrode was obtained. The active material loading of a single electrode was controlled to be 2mg / cm². The long-cycle stability test was conducted using a current density of 10 A / g, performing 10,000 constant current charge-discharge cycles.

[0037] The test results for the embodiments and comparative examples are shown in Table 1. Table 1

[0038] As can be seen from the data in Table 1, the carbon materials prepared in Examples 1-7 of this invention have a specific capacity of more than 280 F / g at a current density of 1 A / g, which is much higher than that of the comparative sample; the capacity retention rate at a high current density of 20 A / g is more than 77%; and the capacity retention rate after 10,000 cycles is more than 95%. At the same time, after being assembled into a symmetrical supercapacitor, it also exhibits a higher energy density, which fully demonstrates that the preparation method of this invention can endow carbon materials with excellent comprehensive electrochemical performance.

[0039] Compared to the comparative example, the core reason lies in the synergistic process design of this invention: through the interaction of 2,6-diaminopyridine and Zn 2+ The coordination effect of the nitrogen source achieves a uniform molecular-level distribution; the low-temperature pre-carbonization step achieves pre-crosslinking and fixation of the nitrogen source, avoiding the loss of active sites at high temperatures; through the mild template-activation effect of zinc chloride, a hierarchical pore structure is constructed, which not only ensures the full exposure of active sites, but also realizes the rapid transport of electrolyte ions, ultimately achieving high specific capacity, excellent rate performance and long cycle stability simultaneously.

[0040] The high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage has a hierarchical porous structure with micropores, mesopores and macropores distributed in a hierarchical manner. The nitrogen elements doped in the carbon framework are mainly present in the form of pyridine nitrogen and pyrrole nitrogen with high electrochemical activity.

[0041] Compared to Example 1, Example 2 increased the amount of zinc chloride added, resulting in a slight decrease in specific capacity and rate performance. This is because excessive zinc chloride leads to an overly vigorous activation process, damaging some active sites and causing excessive etching of the pore structure, thus affecting the structural stability of the material and consequently reducing performance. This demonstrates the rationality of the zinc chloride ratio range defined in this invention.

[0042] Compared to Example 1, Example 3 introduced graphene oxide as a conductive framework, resulting in significant improvements in specific capacity, rate performance, and cycle stability. This is because graphene oxide provides a carrier for the growth of coordination polymers, preventing the aggregation of carbon materials. Simultaneously, it constructs a continuous conductive network, reducing the charge transfer impedance of the material and accelerating electrochemical reaction kinetics, thus leading to superior overall performance.

[0043] Compared to Example 1, Examples 4 and 5 replaced the auxiliary nitrogen source with urea and adjusted the pre-carbonization process. Example 4 increased the pre-carbonization temperature, resulting in a slight increase in specific capacity, while Example 5 decreased the pre-carbonization temperature, resulting in a slight decrease in specific capacity. This is because urea, as an auxiliary nitrogen source, releases more nitrogen-containing gas during pyrolysis, achieving in-situ nitrogen doping. Adjusting the pre-carbonization temperature directly affects the degree of polycondensation reaction; pre-carbonization at 800℃ forms a more stable cross-linked framework, better immobilizing active nitrogen species, thus resulting in superior performance.

[0044] Compared to Example 1, Examples 6 and 7 extended the high-temperature activation holding time. With the extension of the holding time, the specific capacity and rate performance of the material gradually decreased. This is because an excessively long activation time leads to over-etching of the carbon skeleton, damaging the stability of some active sites and pore structures, thus reducing performance. This demonstrates the rationality of the activation holding time range defined in this invention.

[0045] The present invention also discloses a supercapacitor comprising the above-mentioned high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage as the electrode active material.

[0046] Furthermore, the method for preparing the electrode sheet of the supercapacitor is as follows: the high nitrogen-doped multi-level porous carbon material suitable for wind farm energy storage, the conductive agent, and the binder are mixed in a preset mass ratio, and the corresponding solvent is added and stirred to form a uniform slurry. The slurry is coated on the current collector, and after drying, rolling, and cutting, the electrode sheet is obtained. The prepared electrode sheet is matched with the separator and electrolyte to assemble a supercapacitor.

[0047] Furthermore, the conductive agent is one or more of superconducting carbon black, acetylene black, carbon nanotubes, and graphene; the binder is one or more of polyvinylidene fluoride, polyacrylic acid, sodium carboxymethyl cellulose, and styrene-butadiene rubber; the current collector is aluminum foil or copper foil; and the electrolyte is any one of aqueous electrolyte, organic electrolyte, or ionic liquid electrolyte.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for preparing high-nitrogen-doped hierarchical porous carbon materials suitable for wind farm energy storage, characterized in that, Includes the following steps: S1. Dissolve 2,6-diaminopyridine and zinc chloride in deionized water, stir and react to form Zn. 2+ The coordination polymer with 2,6-diaminopyridine was then added, and stirring was continued to obtain a gel-like precursor. S2. Place the gel-like precursor in an inert atmosphere, heat it to 500~800℃, and keep it at that temperature for 1~3 hours to allow 2,6-diaminopyridine to undergo a condensation reaction with the auxiliary nitrogen source to form a preliminary cross-linked nitrogen-doped polymer backbone, thus obtaining a pre-carbonized product. S3. Grind the pre-carbonized product into powder, place it in an inert atmosphere, heat it to 900℃, and keep it at that temperature for 60~120 minutes to activate and create pores. After naturally cooling to room temperature, remove residual zinc species by acid washing, wash with deionized water until the filtrate is neutral, and vacuum dry to obtain a high-nitrogen-doped multi-level porous carbon material suitable for wind farm energy storage.

2. The preparation method according to claim 1, characterized in that, In S1, the stirring reaction is carried out at 60~90℃ for 4~8 hours.

3. The preparation method according to claim 1, characterized in that, In S1, the auxiliary nitrogen source is melamine or urea.

4. The preparation method according to claim 1, characterized in that, In S1, when 2,6-diaminopyridine and zinc chloride are dissolved in deionized water, graphene oxide is also added as a conductive framework to make Zn 2+ The coordination polymer with 2,6-diaminopyridine was self-assembled in situ on the surface of graphene oxide.

5. The preparation method according to claim 1, characterized in that, In S2, the inert atmosphere is an argon atmosphere or a nitrogen atmosphere, the pre-carbonization heating rate is 3℃ / min, the temperature is raised to 500~800℃, and held for 1.5~2 hours.

6. The preparation method according to claim 1, characterized in that, In S3, the inert atmosphere is argon, and the activation heating rate is 3~8℃ / min.

7. The preparation method according to claim 1, characterized in that, In S3, the pickling is performed using hydrochloric acid solution, and the vacuum drying temperature is 60~120℃, with a drying time of 8~24 hours.

8. A high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 7.

9. The high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage according to claim 8, characterized in that, The high-nitrogen-doped hierarchical porous carbon material suitable for wind farm energy storage has a hierarchical porous structure with micropores, mesopores and macropores distributed in a hierarchical manner. The nitrogen elements doped in the carbon framework are mainly present in the form of pyridine nitrogen and pyrrole nitrogen with high electrochemical activity.

10. A supercapacitor, characterized in that, The high-nitrogen-doped hierarchical porous carbon material, as described in claim 8, suitable for wind farm energy storage, is used as the electrode active material.

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