A multi-channel high-conductivity porous carbon material, a preparation method and applications thereof

Abstract

The application discloses a kind of multi-channel high-conductive porous carbon material, preparation method and application thereof, preparation method includes the following steps: S1 carbon nanotube acidification treatment obtains carboxylated carbon nanotube, short carboxylated carbon nanotube is obtained after emulsification treatment, again with nitrogenizing agent is mixed evenly, wash to neutral, obtain functionalized carbon nanotube mixed solution A;S2 phenolic monomer, aldehyde monomer and alkaline solution are mixed, and phenol formaldehyde resin oligomer is condensed and polymerized, then mixed with functionalized carbon nanotube mixed solution A, stir evenly, obtain functionalized carbon nanotube-phenol formaldehyde resin precursor mixed solution B;S3 functionalized carbon nanotube-phenol formaldehyde resin precursor mixed solution B is dried to obtain porous carbon dry powder C;S4 porous carbon dry powder C is heated to 800-1200 DEG C, and CO2 is activated by being imported, and after cooling, obtain multi-channel high-conductive porous carbon material.The multi-channel high-conductive porous carbon material obtained by the preparation method provided by the application, carbon nanotube is more evenly dispersed therein, and the specific surface area is larger, and the conductivity is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of porous carbon-based composite material preparation, and particularly relates to a multi-channel high-conductivity porous carbon material, a preparation method and application thereof. BACKGROUND

[0002] Silicon-carbon negative electrode materials have a broad application prospect due to their high specific capacity and increasing penetration rate in the lithium-ion power battery market. The silane deposition method is one of the mainstream processes for preparing silicon-carbon negative electrode materials at present. In brief, a porous carbon is used as a substrate to adsorb silane and other silicon-containing gases, and amorphous silicon particles are formed by high-temperature cracking in the pores of the substrate, so as to slow down the expansion of silicon particles. Therefore, the properties of the porous carbon will directly affect the deposition effect of the silicon-containing gas and the performance of the silicon-carbon product. Resin-based porous carbon raw materials are controllable, adjustable in pore size, and stable in structure, and are currently the ideal porous carbon substrate. However, some properties still need to be improved, such as effective specific surface area and electrical conductivity.

[0003] Carbon nanotubes, as a new type of one-dimensional carbon material, have a unique hollow tubular structure, high electrical conductivity, large specific surface area and excellent mechanical properties. Due to the quantum confinement effect, electrons can quickly migrate along the radial direction of the carbon nanotubes, so they are often combined with other materials to improve the electrochemical performance.

[0004] Chinese patent CN104828804B prepares carbon nanotube-carbon spherical composite material by titration method combined with layered oil bath curing. The obtained porous carbon is uniform in size and controllable, has rich pore structure, high specific surface area and other characteristics, so that the composite material has better adsorption performance. However, carbon nanotubes are prone to entanglement and aggregation, and the problem of uneven dispersion and poor combination exists when carbon nanotubes are directly added in a high molecular solution by physical mixing.

[0005] Chinese patent application CN110148760A adopts one-step solid-phase pyrolysis method to prepare porous carbon-carbon nanotube composite material. The carbon nanotubes are uniformly dispersed on the surface of the porous carbon, which greatly improves the electrical conductivity of the porous carbon material and exhibits excellent electrocatalytic activity. However, the growth of carbon nanotubes is not easy to control (length, diameter, etc.), and the attachment of carbon nanotubes on the surface of carbon material is difficult to improve the internal ion solid-phase mass transfer process of porous carbon.

[0006] Chinese patent application CN105006375A combines carboxylated carbon nanotubes and phenolic resin to avoid the entanglement and aggregation of carbon nanotubes and enhance the combination ability of the two, and further uses nitrogen and phosphorus element doping to improve the electronic conductivity, so as to improve the specific capacitance and cycle stability of supercapacitors. However, the morphology of carbon nanotubes wrapped by phenolic resin is not easy to control after calcination, and the pores formed by internal activation of melamine and phosphating agent are limited, so the obtained porous carbon composite material is a mesoporous structure with relatively small specific surface area. Summary of the Invention

[0007] The purpose of this invention is to provide a multi-channel, highly conductive porous carbon material with good carbon nanotube dispersion, higher conductivity, and large specific surface area; another purpose of this invention is to provide a method for preparing the multi-channel, highly conductive porous carbon material.

[0008] This invention discloses a multi-channel, highly conductive porous carbon material, comprising the following steps:

[0009] S1: Carbon nanotubes are acidified to obtain carboxylated carbon nanotubes, emulsified to obtain short carboxylated carbon nanotubes, and then mixed evenly with a nitriding agent and washed with water until neutral to obtain functionalized carbon nanotube mixture A.

[0010] S2: Phenolic monomers and aldehyde monomers are mixed with an alkaline solution and condensed into phenolic resin oligomers. Then, they are mixed with the functionalized carbon nanotube mixture A and stirred evenly to obtain functionalized carbon nanotube-phenolic resin precursor mixture B.

[0011] S3: Dry the functionalized carbon nanotube-phenolic resin precursor mixture B to obtain porous carbon powder C.

[0012] S4: Heat the porous carbon dry powder C to 800-1200℃, activate it by introducing carbon dioxide, and then cool it down to obtain a multi-channel highly conductive porous carbon material.

[0013] Furthermore, the acid solution used for acidification is a mixture of concentrated sulfuric acid and concentrated nitric acid; the treatment method is as follows: add 100-300 mL of acid solution to 1 g of carbon nanotubes; the acid concentration is 80-99%; the treatment time is 10-60 min.

[0014] When carbon nanotubes are acidified, the carbon chains at the ends of the carbon nanotubes are broken and oxygen-containing functional groups such as carboxyl groups (-COOH) or hydroxyl groups (-OH) are introduced to the surface of the carbon nanotubes, thereby improving the dispersibility and surface activity of the carbon nanotubes, which is beneficial for binding nitriding agents.

[0015] Furthermore, in step S1, the homogenization emulsification process is carried out at a rotation speed of 5000-13000 rpm for 10-60 minutes.

[0016] Carboxylated carbon nanotubes are broken into short carboxylated carbon nanotubes after homogenization and emulsification, which improves the dispersibility of carboxylated carbon nanotubes and thus solves the problem of carbon nanotube entanglement and aggregation.

[0017] Furthermore, in step S1, the short carboxylated carbon nanotubes have a diameter of 1-10 nm and a length of 0.5-2 μm.

[0018] Furthermore, in step S1, the mass ratio of the added nitriding agent to the mass of the carbon nanotube is 1-2:1; the nitriding agent is selected from one or more of melamine, dicyandiamide, urea, and thiourea.

[0019] During the subsequent high-temperature heating process, the nitriding agent both dops the carbon material and creates pores in it.

[0020] Furthermore, in step S2, the mass ratio of the added phenolic monomer to the added aldehyde monomer is 1:1-2; the phenolic monomer is selected from one or more of phenol, hydroquinone, catechol, and resorcinol; the aldehyde monomer is selected from one of formaldehyde, paraformaldehyde, paraformaldehyde, acetaldehyde, and propionaldehyde.

[0021] Furthermore, the alkaline solution is selected from one of the following: aqueous solution of NaOH, aqueous solution of KOH, aqueous solution of Na2CO3, aqueous solution of NaHCO3, or ammonia water; the reaction temperature is 30-80℃, and the stirring time is 1-5h.

[0022] Furthermore, the alkaline solution is selected from aqueous solutions of NaOH, KOH, Na2CO3, and NaHCO3; the concentration of the aqueous solution is 25-40 wt%.

[0023] Furthermore, in step S2, the volume of the added functionalized carbon nanotube mixture A accounts for 5-15% of the total volume of the mixture.

[0024] Furthermore, in step S3, the drying operation is atomization drying; the inlet temperature of the atomization drying is 110-150℃, and the feeding rate is 0.2-0.5L / h; the D50 of the spherical porous carbon dry powder C is 6-12μm.

[0025] The spherical structure of porous carbon can be controlled by atomization drying to improve its tap density and compaction density.

[0026] Furthermore, by adding pure water, the solid content of the functionalized carbon nanotube-phenolic resin precursor mixture before atomization drying is adjusted to 5-30%.

[0027] The solid content of the functionalized carbon nanotube-phenolic resin precursor mixture is controlled within this range to prevent the mixture from becoming too viscous and affecting the spraying effect.

[0028] Furthermore, in step S4, the spherical porous carbon dry powder C is heated using a CVD rotary furnace; the rotation speed of the CVD rotary furnace is 0.2-1.5 r / min.

[0029] Furthermore, in step S4, a two-stage heating method is adopted; the first stage of heating is to raise the temperature from room temperature to 300-600℃ and hold it for 1-2 hours; the second stage of heating is to raise the temperature to 800-1200℃ and hold it for 1-10 hours; at the end of the second stage of heating, CO2 gas is introduced, and the flow rate of CO2 gas is 0.2-2L / min.

[0030] During the first stage of heating and heat preservation, the volatiles inside the multi-channel highly conductive porous carbon material are fully released. In the second stage of heating and heat preservation, carbon dioxide is used to create pores, resulting in higher pore-forming efficiency.

[0031] Furthermore, in step S4, the multi-channel highly conductive porous carbon material is sieved; the sieve mesh size is 200-350 mesh.

[0032] This invention also provides a multi-channel, highly conductive porous carbon material, prepared using the method described above; it has a density of 1700 μm. 2 Specific surface area above / g; resistivity less than 0.45Ω·cm.

[0033] This invention also provides an application of a multi-channel highly conductive porous carbon material, which uses the multi-channel highly conductive spherical porous carbon described above to prepare lithium-ion batteries.

[0034] The method for preparing multi-channel highly conductive porous carbon materials provided by this invention first functionalizes carbon nanotubes to improve their dispersion performance; then, they are added to a phenolic resin polymerization reaction solution and mixed uniformly with phenolic resin oligomers; during high-temperature treatment, the bound nitriding agent is decomposed, creating pores from the inside out, with pore creation and doping occurring simultaneously. Heteroatomic nitrogen doping further accelerates electron transfer and improves the conductivity of the material; CO2 activation expands the pores from the outside in, creating bidirectional pores, increasing the porosity of the material, and shortening the pore creation time; the pore structure is dominated by micropores, resulting in denser pores; the introduction of carbon nanotubes enhances the mechanical strength of the porous carbon while forming crisscrossing channels within the porous carbon, accelerating electron transfer and improving conductivity. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the multi-channel highly conductive porous carbon material according to an embodiment of the present invention;

[0036] Figure 2 This is the XRD pattern of the multichannel highly conductive porous carbon material in Example 1 of this invention;

[0037] Figure 3 This is the N2 adsorption-desorption curve of the multi-channel highly conductive porous carbon material in Example 1 of this invention;

[0038] Figure 4This is a BJH desorption pore size distribution diagram of the multi-channel highly conductive porous carbon material in Example 1 of this invention;

[0039] Figure 5 This is the HK method micropore size distribution diagram of the multi-channel highly conductive porous carbon material in Example 1 of this invention;

[0040] Figure 6 This is the charge-discharge curve of the silicon-carbon material prepared using the multi-channel highly conductive porous carbon material as a carbon substrate in Example 1 of this invention. Detailed Implementation

[0041] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] Preparation of multi-channel, highly conductive porous carbon materials:

[0044] Preparation of S1 functionalized carbon nanotube mixture A: 1g of carbon nanotubes were placed in 150mL of a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio of concentrated sulfuric acid to concentrated nitric acid was 2:1) and stirred for 30min. After high-speed homogenization emulsification at 12000rpm for 20min, short carboxylated carbon nanotubes (diameter 2nm, length 1μm) were obtained. Then, 1.5g of dicyandiamide was slowly added, stirred, and washed with water until neutral to obtain functionalized carbon nanotube mixture A.

[0045] Preparation of S2 functionalized carbon nanotube-phenolic resin precursor mixture B: Resorcinol and formaldehyde were added to a 30wt% NaOH aqueous solution at a mass ratio of 1:1.5 (the mass of NaOH was 5% of the mass of the phenol monomer). After stirring at 60℃ for 5h, the mixture A obtained in step S1 was slowly added (the volume of mixture A accounted for 10% of the total solution volume). Stirring was continued to obtain functionalized carbon nanotube-phenolic resin oligomer. Then, pure water was added to adjust the solid content of the emulsion to 20% to obtain precursor mixture B.

[0046] S3 involves atomizing and drying the mixture B obtained in step S2, with an inlet temperature of 120℃ and a feed rate of 0.3L / min, resulting in porous carbon dry powder C with a particle size D50 controlled at 7-8μm.

[0047] S4. The spherical porous carbon powder C obtained in step S3 is placed in a CVD rotary furnace with a rotation speed of 0.5 r / min. The temperature is first raised to 400℃ and held for 1 h, then raised to 900℃. CO2 gas is passed through at a flow rate of 0.2 L / min and held for 4 h. After cooling, the obtained powder is passed through a 300-mesh sieve to obtain a multi-channel highly conductive porous carbon material.

[0048] like Figure 1As shown, the multi-channel highly conductive porous carbon material has an overall spherical structure, with an outer layer of phenolic resin carbon layer and an interior of diversified tubular channels formed by carbon nanotubes.

[0049] Example 2

[0050] Preparation of multi-channel, highly conductive porous carbon materials:

[0051] Preparation of S1 functionalized carbon nanotube mixture A: 1g of carbon nanotubes were placed in 200mL of a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio of concentrated sulfuric acid to concentrated nitric acid was 2:1) and stirred for 50min. After high-speed homogenization emulsification at 12000rpm for 20min, short carboxylated carbon nanotubes (diameter 4nm, length 0.8μm) were obtained. Then, 1.2g of melamine was slowly added, stirred, and washed with water until neutral to obtain functionalized carbon nanotube mixture A.

[0052] Preparation of S2 functionalized carbon nanotube-phenolic resin precursor mixture B: Resorcinol and formaldehyde were added to a 28% wt% NaOH solution at a mass ratio of 1:1.3 (the mass of NaOH was 5% of the mass of the phenol monomer). After stirring at 70℃ for 3.5h, mixture A obtained in step S1 was slowly added (the volume of mixture A accounted for 10% of the total solution volume). Stirring was continued to obtain functionalized carbon nanotube-phenolic resin oligomer. Then, pure water was added to adjust the solid content of the emulsion to 15% to obtain precursor mixture B.

[0053] S3 involves atomizing and drying the mixture B obtained in step S2 at an inlet temperature of 130°C and a feed rate of 0.5 L / min, with the resulting porous carbon dry powder C having a particle size D50 controlled at 7-8 μm.

[0054] S4. The porous carbon dry powder C obtained in step S3 is placed in a CVD rotary kiln with a rotation speed of 0.5 r / min. The temperature is first raised to 400℃ and held for 1 hour, then raised to 900℃. CO2 gas is passed through at a flow rate of 0.3 L / min and held for 4 hours. After cooling, the dry powder is passed through a 300-mesh sieve to obtain a multi-channel high-conductivity porous carbon material.

[0055] Example 3

[0056] Preparation of multi-channel, highly conductive porous carbon materials:

[0057] Preparation of S1 functionalized carbon nanotube mixture A: 1g of carbon nanotubes were placed in 200mL of a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio of concentrated sulfuric acid to concentrated nitric acid was 2:1) and stirred for 50min. After high-speed homogenization emulsification at 10000rpm for 40min, short carboxylated carbon nanotubes (diameter 4nm, length 1μm) were obtained. Then, 1.5g of melamine was slowly added, stirred, and washed with water until neutral to obtain functionalized carbon nanotube mixture A.

[0058] Preparation of S2 functionalized carbon nanotube-phenolic resin precursor mixture B: Resorcinol and trioxymethylene were added to a 35wt% KOH solution at a mass ratio of 1:1.6 (KOH mass is 8% of the phenol monomer mass). After stirring at 70℃ for 3h, mixture A obtained in step S1 (accounting for 12% of the total solution volume) was slowly added and stirred continuously to obtain functionalized carbon nanotube-phenolic resin oligomer. Then, pure water was added to adjust the emulsion solid content to 20% to obtain precursor mixture B.

[0059] S3 involves atomizing and drying the mixture B obtained in step S2, with an inlet temperature of 130℃ and a feed rate of 0.2L / min, resulting in porous carbon dry powder C with a particle size D50 controlled at 8-9μm;

[0060] S4. The porous carbon dry powder C obtained in step S3 is placed in a CVD rotary furnace with a rotation speed of 0.3 r / min. The temperature is first raised to 500℃ and held for 1 hour, then raised to 950℃. CO2 gas is passed through at a flow rate of 0.2 L / min and held for 3 hours. After cooling, the dry powder is passed through a 300-mesh sieve to obtain a multi-channel high-conductivity porous carbon material.

[0061] Example 4

[0062] Preparation of multi-channel, highly conductive porous carbon materials:

[0063] Preparation of S1 functionalized carbon nanotube mixture A: 1g of carbon nanotubes were placed in a mixture of 150mL of concentrated sulfuric acid and concentrated nitric acid and stirred for 30min. After high-speed homogenization emulsification at 12000rpm for 20min, short carboxylated carbon nanotubes (diameter 2nm, length 1μm) were obtained. Then, 1.5g of dicyandiamide was slowly added, stirred, and washed with water until neutral to obtain functionalized carbon nanotube mixture A.

[0064] Preparation of S2 functionalized carbon nanotube-phenolic resin precursor mixture B: Resorcinol and formaldehyde were added to a 30wt% NaOH solution at a mass ratio of 1:1.5 (the mass of NaOH was 5% of the mass of the phenol monomer). After stirring at 60℃ for 5h, the mixture A obtained in step S1 was slowly added (the volume of mixture A accounted for 10% of the total solution volume). Stirring was continued to obtain functionalized carbon nanotube-phenolic resin precursor mixture B.

[0065] S3 After centrifuging, washing, drying and pulverizing the mixture B obtained in step S2, porous carbon dry powder C is obtained. The particle size D50 of the obtained porous carbon dry powder C is controlled at 7-8 μm.

[0066] S4. The porous carbon dry powder C obtained in step S3 is placed in a CVD rotary kiln with a rotation speed of 0.5 r / min. The temperature is first raised to 400℃ and held for 1 hour, then raised to 900℃. CO2 gas is passed through at a flow rate of 0.2 L / min and held for 4 hours. After cooling, the dry powder is passed through a 300-mesh sieve to obtain a multi-channel highly conductive porous carbon material.

[0067] Comparative Example 1

[0068] 1) Preparation of phenolic resin precursor mixture: Resorcinol and formaldehyde were added to a 30wt% NaOH solution at a mass ratio of 1:1.5 (the mass of NaOH was 5% of the mass of the phenol monomer). After stirring at 60℃ for 5h, 1.5g of dicyandiamide was slowly added and stirred continuously to obtain phenolic resin oligomer. Then, pure water was added to adjust the solid content of the emulsion to 20% to obtain phenolic resin precursor mixture.

[0069] 2) The phenolic resin precursor mixture obtained in step 1) is atomized and dried at an inlet temperature of 120℃ and a feed rate of 0.3L / min. The particle size D50 of the resulting dry powder is controlled at 7-8μm.

[0070] 3) Place the dry powder obtained in step 2) in a CVD rotary kiln with a rotation speed of 0.5 r / min. First, heat the powder to 400℃ and hold it for 1 hour. Then, heat it to 900℃ and pass CO2 gas through it at a flow rate of 0.2 L / min. Hold the powder for 4 hours. After cooling, pass the dry powder through a 300-mesh sieve to obtain porous carbon material.

[0071] Performance testing and conclusions:

[0072] The porous carbon materials obtained in Examples 1-4 and Comparative Example 1 were subjected to tap density tests, powder compaction density tests, powder resistance tests, and nitrogen adsorption / desorption isotherm tests; the results are shown in Table 1.

[0073] Table 1. Performance test results of porous carbon obtained in Examples 1-4 and Comparative Example 1.

[0074] Serial number Number tapping g / cm 3 ]] Compacted g / cm 3 ]]> Resistivity Ω-cm Specific surface m 2 / g]]> 1 Example 1 0.56 0.94 0.14 196 7 2 Example 2 0.56 0.96 0.11 1896 3 Example 3 0.58 0.99 0.18 1835 4 Example 4 0.44 0.83 0.45 1792 5 Comparative Example 1 0.60 1.01 1.02 1478

[0075] Examples 1-4 exhibit better electrical conductivity and a larger specific surface area compared to Comparative Example 1. Compared to Example 4, Examples 1-3, obtained through spray drying, show higher tap density and compaction density, and superior electrical conductivity.

[0076] The multichannel highly conductive porous carbon material prepared in Example 1 was subjected to XRD and nitrogen adsorption / desorption isotherm tests. The results are as follows: Figures 2-5 As shown.

[0077] like Figure 2As shown in the XRD pattern of Example 1, the obtained multi-channel highly conductive porous carbon material mainly exhibits an amorphous carbon structure.

[0078] like Figure 3 As shown, the nitrogen adsorption-desorption curve of Example 1 indicates that the obtained multi-channel highly conductive porous carbon material is a type I adsorption isotherm, and its pore structure is mainly a microporous structure with more compact pores.

[0079] like Figure 4 As shown, the BJH desorption curve of Example 1 has an average pore size of 1.7 nm.

[0080] like Figure 5 As shown, the micropore size distribution of the HK method in Example 1 is 0.7-1 nm, and the pore size distribution is more uniform.

[0081] The multi-channel highly conductive porous carbon material obtained in Example 1 was subjected to vapor deposition of silicon carbon. The mass of silicon deposition was 50-52% of the porous carbon mass. The obtained silicon carbon material was then used to prepare a 2032 button battery for evaluation. Specifically, the prepared silicon carbon material, conductive agent VGCF, and binder LA136 were mixed in a ratio of 75:5:10:10. Water was used as the solvent, and the slurry was coated onto a copper foil. The counter electrode was a lithium sheet, and the separator was a Celgard 2400 microporous polypropylene membrane. The charge / discharge cutoff voltage was 0.005-1.5V. The discharge rate was first discharged at 0.1C to 0.005V, then discharged at 0.02C to 0.005V to ensure full discharge. The charging rate was 0.1C to 1.5V.

[0082] The results are as follows Figure 6 As shown, the multi-channel highly conductive porous carbon obtained in Example 1 was used for silane deposition on a carbon substrate. The resulting silicon-carbon material had a reversible capacity of 2215 mAh / g and an initial charge / discharge efficiency of 90.5%, exhibiting excellent electrical performance.

[0083] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing a multi-channel, highly conductive porous carbon material, characterized in that, Includes the following steps: S1: Carbon nanotubes are acidified to obtain carboxylated carbon nanotubes, emulsified to obtain short carboxylated carbon nanotubes, and then mixed evenly with a nitriding agent and washed with water until neutral to obtain functionalized carbon nanotube mixture A. S2: Phenolic monomers and aldehyde monomers are mixed with an alkaline solution and condensed into phenolic resin oligomers. Then, they are mixed with the functionalized carbon nanotube mixture A and stirred evenly to obtain functionalized carbon nanotube-phenolic resin precursor mixture B. S3: Dry the functionalized carbon nanotube-phenolic resin precursor mixture B to obtain porous carbon powder C. S4: Heat the porous carbon dry powder C to 800-1200℃, activate it by introducing carbon dioxide, and then cool it down to obtain a multi-channel high-conductivity porous carbon material. In step S1, the emulsification process is carried out at a speed of 5000-13000 rpm for 10-60 minutes. In step S1, the short carboxylated carbon nanotubes have a diameter of 1-10 nm and a length of 0.5-2 μm. In step S1, the mass ratio of the added nitriding agent to the mass of the carbon nanotube is 1-2:1; the nitriding agent is selected from one or more of melamine, dicyandiamide, urea, and thiourea.

2. The method for preparing a multi-channel highly conductive porous carbon material according to claim 1, characterized in that, In step S2, the mass ratio of the added phenolic monomer to the added aldehyde monomer is 1:1-2; the phenolic monomer is selected from one or more of phenol, hydroquinone, catechol, and resorcinol; the aldehyde monomer is selected from one of formaldehyde, paraformaldehyde, paraformaldehyde, acetaldehyde, and propionaldehyde.

3. The method for preparing a multi-channel highly conductive porous carbon material according to claim 1, characterized in that, In step S2, the volume of the added functionalized carbon nanotube mixture A accounts for 5-15% of the total volume of the mixture.

4. The method for preparing a multi-channel highly conductive porous carbon material according to claim 1, characterized in that, In step S3, the drying operation is atomization drying; the inlet temperature of atomization drying is 110-150℃, and the feed rate is 0.2-0.5L / h; the D50 of the porous carbon dry powder C is 6-12μm.

5. The method for preparing a multi-channel highly conductive porous carbon material according to claim 1, characterized in that, In step S4, a two-stage heating method is adopted; the first stage of heating is to raise the temperature from room temperature to 300-600℃ and hold it for 1-2 hours; the second stage of heating is to raise the temperature to 800-1200℃ and hold it for 1-10 hours; at the end of the second stage of heating, CO2 gas is introduced, and the flow rate of CO2 gas is 0.2-2L / min.

6. A multi-channel, highly conductive porous carbon material, characterized in that, Prepared by the preparation method according to any one of claims 1-5; having a density of 1700 m 2 Specific surface area above / g; resistivity less than 0.45Ω·cm.

7. An application of a multi-channel, highly conductive porous carbon material, characterized in that, The multi-channel highly conductive porous carbon described in claim 6 is used to prepare lithium-ion batteries.

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