Conductive paste for lithium-ion battery positive electrode

Abstract

The present invention discloses a conductive slurry for lithium-ion battery positive electrodes. The slurry comprises the following substances: 1-2 parts graphene, 4-5 parts modified polymer, and 90-100 parts N-methylpyrrolidone, by weight. The modified polymer is prepared by mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate, and deionized water, stirring at room temperature for 30-40 minutes, then introducing nitrogen to deoxygenate for 1-2 hours, then adding ammonium persulfate, and heating the mixture to 60-70°C under a protective atmosphere for 3-4 hours. The mixture is then heated to 90-100°C and allowed to react for 3-4 hours. After the reaction is complete, the mixture is filtered, washed, and dried to obtain the modified polymer. Advantages: The present invention chemically modifies the surface of carbon nanotubes, allowing them to participate in the synthesis of the modified polymer (polyacrylonitrile binder), resulting in the slurry having good electrical conductivity and stability in battery applications.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a conductive paste for a positive electrode of a lithium-ion battery. Background Art

[0002] In the field of lithium-ion batteries, positive electrode conductive paste is a key component of electrode materials, and its performance directly affects the battery's conductivity, cycle stability and rate performance.

[0003] Currently, conventional conductive pastes primarily utilize conductive carbon black, carbon nanotubes, or graphene as conductive agents, and polymers such as polyvinylidene fluoride (PVDF) as binders. However, these pastes exhibit significant drawbacks: First, the conductive agent and binder are typically only physically mixed, lacking chemical bonding, resulting in high interfacial contact resistance and limited electron conduction efficiency. Second, during charge and discharge, the volume change of the electrode material can easily break the conductive network, causing rapid capacity decay. Furthermore, traditional binders such as PVDF lack sufficient adhesion to the active material, resulting in poor mechanical strength of the electrode and prone to delamination failure. While carbon nanotubes and graphene can improve conductivity, their poor dispersibility and tendency to agglomerate make it difficult to form a uniform and stable three-dimensional conductive network in practical applications. Existing methods, such as simple physical modification or surfactant treatment, can partially alleviate these issues, but they still fail to fundamentally address core issues such as poor interfacial compatibility between the conductive agent and the polymer matrix and insufficient long-term cycling stability.

[0004] Therefore, in order to solve the above problems, the present invention provides a conductive paste for a lithium ion battery positive electrode. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a conductive paste for lithium ion battery positive electrode.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A conductive paste for a lithium-ion battery positive electrode, comprising the following substances: 1-2 parts by weight of graphene, 4-5 parts of a modified polymer, and 90-100 parts of N-methylpyrrolidone;

[0008] The preparation process of the modified polymer comprises: mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate and deionized water, stirring at room temperature for 30-40 minutes, then introducing nitrogen to deoxygenate for 1-2 hours, then adding ammonium persulfate, raising the temperature to 60-70° C. under a protective atmosphere, reacting for 3-4 hours, then continuing to raise the temperature to 90-100° C., reacting for 3-4 hours, and after the reaction is completed, filtering, washing and drying to obtain the modified polymer.

[0009] More optimally, the modified polymer raw material includes the following components: by weight, 1-2 parts of modified carbon nanotubes, 7-8 parts of acrylonitrile, 2.5-3.5 parts of methyl acrylate, 2-3 parts of sodium methyl propylene sulfonate, and 100-120 parts of deionized water.

[0010] More optimally, the preparation process of the modified carbon nanotubes is:

[0011] S1: Dissolve 4-aminophenol in a mixed solution of 37% hydrochloric acid and deionized water, cool to 0-5°C, then add sodium nitrite aqueous solution dropwise, stir at 0-5°C for 1-2 hours, then mix with 2-hydroxy-3-methoxybenzaldehyde, stir at room temperature overnight, filter, and recrystallize to obtain intermediate A;

[0012] S2: Under protective atmosphere, intermediate A, 2-aminoimidazole, magnesium sulfate, and N,N-dimethylformamide were mixed, glacial acetic acid was added, the temperature was raised to 50-60°C, the reaction was carried out for 2-3 hours, and the mixture was filtered, washed, and dried to obtain intermediate B;

[0013] S3: Mix intermediate B, triethylamine, and acetone, stir evenly, and slowly add 6-chloro-1-hexene dropwise. React at room temperature for 1-2 hours. After purification, obtain intermediate C.

[0014] S4: Disperse the carboxylated carbon nanotubes in thionyl chloride, increase the temperature to 60-80°C, react for 24 hours, and dry to obtain chlorinated carbon nanotubes; under a protective atmosphere, mix the intermediate C with dichloromethane, cool to 0°C in an ice bath, slowly add pyridine, stir for 10-15 minutes, then add chlorinated carbon nanotubes, increase the temperature to 30-40°C, react for 2-4 hours, and post-treat to obtain modified carbon nanotubes.

[0015] In the scheme, 4-aminophenol reacts with sodium nitrite under acidic conditions to form a diazonium salt, which is then coupled with 2-hydroxy-3-methoxybenzaldehyde to produce intermediate A. The specific synthesis process is shown below:

[0016]

[0017] In the scheme, the aldehyde group of intermediate A undergoes nucleophilic addition and dehydration reaction with the amino group of 2-aminoimidazole under acidic conditions to generate a Schiff base structure containing an imine bond (C=N). Magnesium sulfate acts as a water absorbent to push the reaction equilibrium toward the product, ultimately obtaining intermediate B. The specific synthesis process is shown below:

[0018]

[0019] In the scheme, the nitrogen atom on the imidazole ring contained in intermediate B has a lone pair of electrons, which acts as a nucleophile to attack the carbon end of the partially positively charged carbon-chlorine bond (C-Cl) in 6-chloro-1-hexene, causing the chloride ion to leave and form a new CN bond, thereby obtaining intermediate C. The specific synthesis process is shown below:

[0020]

[0021] In the scheme, the phenolic hydroxyl group contained in intermediate C acts as a nucleophile under alkaline conditions, attacking the partially positively charged carbonyl carbon in the acyl chloride group, causing the chloride ion to leave and form an ester bond, thereby covalently grafting intermediate C to the surface of the carbon nanotube.

[0022] More optimally, the intermediate A raw material includes the following components: by weight, 100-120 parts of 4-aminophenol, 150-180 parts of 37% hydrochloric acid, 200-250 parts of deionized water, 70-80 parts of sodium nitrite aqueous solution, and 160-170 parts of 2-hydroxy-3-methoxybenzaldehyde.

[0023] More optimally, the intermediate B raw material includes the following components: by weight, 100-120 parts of intermediate A, 60-70 parts of 2-aminoimidazole, 20-25 parts of magnesium sulfate, 300-350 parts of N,N-dimethylformamide, and 50-55 parts of glacial acetic acid.

[0024] More optimally, the intermediate C raw material includes the following components: by weight, 10-12 parts of intermediate B, 6-7 parts of triethylamine, 100-120 parts of acetone, and 12-13 parts of 6-chloro-1-hexene.

[0025] More optimally, in the acyl chloride carbon nanotubes, the mass ratio of the carboxylated carbon nanotubes to thionyl chloride is 1:3.

[0026] More optimally, the modified carbon nanotube raw material comprises the following components: by weight, 20-22 parts of intermediate C, 150-180 parts of dichloromethane, 7-9 parts of pyridine, and 10-12 parts of acyl chloride carbon nanotubes.

[0027] Beneficial effects of the present invention:

[0028] The present invention chemically modifies the surface of carbon nanotubes, allowing them to participate in the synthesis process of the modified polymer (polyacrylonitrile binder), thereby making the slurry have good conductivity and stability in battery applications. The details are as follows:

[0029] First, the imidazolium salt groups grafted onto the carbon nanotube surface, due to their unique conjugated structure and positive charge, effectively promote electron delocalization and significantly reduce interfacial contact resistance. These imidazolium salt groups form covalent bonds with the carbon nanotubes, establishing continuous electron transport channels, thereby significantly improving the overall conductivity of the system. Simultaneously, the surface-grafted azo groups act as efficient electron bridges, further enhancing the hopping conduction capability of electrons between the carbon nanotubes and the polymer matrix.

[0030] Second: Modified carbon nanotubes participate in polymer synthesis through surface-grafted chemical molecules, and their unique one-dimensional electron conduction properties provide long-range electron transport channels throughout the electrode. At the same time, polymer molecular chains form short-range electron hopping paths between carbon nanotubes, and the combination of the two constructs a three-dimensional continuous conductive network. The conjugated main chain structure of the polymer ensures efficient delocalization of electrons within the molecule, while the covalent connection between carbon nanotubes and polymers significantly reduces the interfacial contact resistance, allowing electrons to migrate rapidly throughout the network. This structure not only improves the overall conductivity of the electrode, but also enhances the stability of the material, making it suitable for high-energy-density battery systems.

[0031] Third: Carbon nanotubes serve as a rigid skeleton and are covalently bonded to conductive polymers to form a composite structure that is both rigid and flexible. The high modulus properties of carbon nanotubes effectively suppress the macroscopic deformation of the electrode material, while the flexible polymer chains absorb and disperse local stress through ductility, buffering the volume changes of the electrode during the charge and discharge process. In addition, the polar functional groups on the polymer chains are tightly bound to the surface of the active particles through secondary interactions such as hydrogen bonds and coordination bonds, further enhancing the structural stability of the electrode. This three-dimensional network not only has excellent mechanical properties, but also maintains the integrity of the conductive and ion transport pathways during repeated charge and discharge, thereby improving the long-term cycle performance of the electrode. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] Example 1: A conductive paste for a lithium-ion battery positive electrode, comprising the following substances: by weight, 1 part graphene, 4 parts modified polymer, and 90 parts N-methylpyrrolidone;

[0034] The preparation process of the modified polymer comprises: mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate, and deionized water, stirring at room temperature for 30 minutes, then introducing nitrogen to deoxygenate for 1 hour, then adding ammonium persulfate, raising the temperature to 60° C. under a protective atmosphere, reacting for 3 hours, then further raising the temperature to 90° C., reacting for 3 hours, and after the reaction is completed, filtering, washing, and drying to obtain the modified polymer;

[0035] The preparation process of the modified carbon nanotubes is as follows:

[0036] S1: Dissolve 100 parts of 4-aminophenol in a mixed solution of 150 parts of 37% hydrochloric acid and 200 parts of deionized water, cool to 0°C, then add 70 parts of sodium nitrite aqueous solution dropwise, stir at 0°C for 1 hour, then mix with 160 parts of 2-hydroxy-3-methoxybenzaldehyde, stir at room temperature overnight, filter, and recrystallize to obtain intermediate A;

[0037] S2: Under protective atmosphere, 100 parts of intermediate A, 60 parts of 2-aminoimidazole, 20 parts of magnesium sulfate, and 300 parts of N,N-dimethylformamide were mixed, 50 parts of glacial acetic acid were added, the temperature was raised to 50°C, the reaction was carried out for 2 hours, and the mixture was filtered, washed, and dried to obtain intermediate B;

[0038] S3: 10 parts of intermediate B, 6 parts of triethylamine, and 100 parts of acetone were mixed and stirred evenly, and then 12 parts of 6-chloro-1-hexene were slowly added dropwise. The mixture was reacted at room temperature for 1 hour. After purification, intermediate C was obtained;

[0039] S4: Disperse 10 parts of carboxylated carbon nanotubes into thionyl chloride, increase the temperature to 60°C, react for 24 hours, and dry to obtain 30 parts of chlorinated carbon nanotubes; under a protective atmosphere, mix with 20 parts of intermediate C and 150 parts of dichloromethane, cool to 0°C in an ice bath, slowly add 7 parts of pyridine, stir for 10 minutes, then add 10 parts of chlorinated carbon nanotubes, increase the temperature to 30°C, react for 2 hours, and post-treat to obtain modified carbon nanotubes.

[0040] Example 2: A conductive paste for a lithium-ion battery positive electrode, comprising the following substances: 2 parts by weight of graphene, 5 parts of a modified polymer, and 100 parts of N-methylpyrrolidone;

[0041] The preparation process of the modified polymer comprises: mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate, and deionized water, stirring at room temperature for 40 minutes, then introducing nitrogen to deoxygenate for 2 hours, then adding ammonium persulfate, raising the temperature to 70° C. under a protective atmosphere, reacting for 4 hours, then further raising the temperature to 100° C., reacting for 4 hours, and after the reaction is completed, filtering, washing, and drying to obtain the modified polymer;

[0042] The preparation process of the modified carbon nanotubes is as follows:

[0043] S1: 120 parts of 4-aminophenol were dissolved in a mixed solution of 180 parts of 37% hydrochloric acid and 250 parts of deionized water, cooled to 5°C, and then 80 parts of sodium nitrite aqueous solution were added dropwise. The mixture was stirred at 5°C for 2 hours, and then mixed with 170 parts of 2-hydroxy-3-methoxybenzaldehyde. The mixture was stirred at room temperature overnight, filtered, and recrystallized to obtain intermediate A.

[0044] S2: Under protective atmosphere, 120 parts of intermediate A, 70 parts of 2-aminoimidazole, 25 parts of magnesium sulfate, and 350 parts of N,N-dimethylformamide were mixed, 55 parts of glacial acetic acid were added, the temperature was raised to 60°C, the reaction was carried out for 3 hours, and the mixture was filtered, washed, and dried to obtain intermediate B;

[0045] S3: 12 parts of intermediate B, 7 parts of triethylamine, and 120 parts of acetone were mixed and stirred evenly, and then 13 parts of 6-chloro-1-hexene were slowly added dropwise. The mixture was reacted at room temperature for 2 hours. After purification, intermediate C was obtained;

[0046] S4: Disperse 10 parts of carboxylated carbon nanotubes into thionyl chloride, increase the temperature to 80°C, react for 24 hours, and dry to obtain 30 parts of chlorinated carbon nanotubes; under a protective atmosphere, mix with 22 parts of intermediate C and 180 parts of dichloromethane, cool to 0°C in an ice bath, slowly add 9 parts of pyridine, stir for 15 minutes, then add 12 parts of chlorinated carbon nanotubes, increase the temperature to 40°C, react for 4 hours, and post-treat to obtain modified carbon nanotubes.

[0047] Example 3: A conductive paste for a lithium-ion battery positive electrode, comprising the following substances: 1.5 parts of graphene, 4.5 parts of a modified polymer, and 95 parts of N-methylpyrrolidone, by weight;

[0048] The preparation process of the modified polymer comprises: mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate, and deionized water, stirring at room temperature for 35 minutes, then introducing nitrogen to deoxygenate for 1.5 hours, then adding ammonium persulfate, raising the temperature to 65° C. under a protective atmosphere, reacting for 3.5 hours, then further raising the temperature to 95° C., reacting for 3.5 hours, and after the reaction is completed, filtering, washing, and drying to obtain the modified polymer;

[0049] The preparation process of the modified carbon nanotubes is as follows:

[0050] S1: 110 parts of 4-aminophenol were dissolved in a mixed solution of 165 parts of 37% hydrochloric acid and 225 parts of deionized water, cooled to 2.5°C, then 75 parts of sodium nitrite aqueous solution were added dropwise, and stirred at 2.5°C for 1.5 hours. The mixture was then mixed with 165 parts of 2-hydroxy-3-methoxybenzaldehyde, stirred at room temperature overnight, filtered, and recrystallized to obtain Intermediate A;

[0051] S2: Under protective atmosphere, 110 parts of intermediate A, 65 parts of 2-aminoimidazole, 22.5 parts of magnesium sulfate, and 325 parts of N,N-dimethylformamide were mixed, 52.5 parts of glacial acetic acid were added, the temperature was raised to 55°C, the reaction was carried out for 2.5 hours, and the mixture was filtered, washed, and dried to obtain intermediate B;

[0052] S3: 11 parts of intermediate B, 6.5 parts of triethylamine, and 110 parts of acetone were mixed and stirred evenly, and then 12.5 parts of 6-chloro-1-hexene were slowly added dropwise. The mixture was reacted at room temperature for 1.5 hours. After purification, intermediate C was obtained.

[0053] S4: Disperse 10 parts of carboxylated carbon nanotubes into thionyl chloride, increase the temperature to 70°C, react for 24 hours, and dry to obtain 30 parts of chlorinated carbon nanotubes; under a protective atmosphere, mix with 21 parts of intermediate C and 165 parts of dichloromethane, cool to 0°C in an ice bath, slowly add 8 parts of pyridine, stir for 12.5 minutes, then add 11 parts of chlorinated carbon nanotubes, increase the temperature to 35°C, react for 3 hours, and post-treat to obtain modified carbon nanotubes.

[0054] Comparative Example 1: No modified carbon nanotubes were added, and the rest was the same as in Example 3, as follows:

[0055] A conductive paste for a lithium-ion battery positive electrode, comprising the following substances: 1.5 parts by weight of graphene, 4.5 parts by weight of a modified polymer, and 95 parts by weight of N-methylpyrrolidone;

[0056] The preparation process of the modified polymer is as follows: acrylonitrile, methyl acrylate, sodium methyl propylene sulfonate and deionized water are mixed, stirred at room temperature for 35 minutes, then nitrogen is introduced for deoxygenation for 1.5 hours, then ammonium persulfate is added, and under a protective atmosphere, the temperature is raised to 65° C. and reacted for 3.5 hours, and then the temperature is further raised to 95° C. and reacted for 3.5 hours. After the reaction is completed, the mixture is filtered, washed and dried to obtain the modified polymer.

[0057] Comparative Example 2: PVDF was used instead of the modified polymer, and the rest was the same as in Example 3, as follows:

[0058] A conductive paste for a lithium-ion battery positive electrode comprises the following substances: 1.5 parts of graphene, 4.5 parts of PVDF, and 95 parts of N-methylpyrrolidone, in parts by weight.

[0059] Detection test:

[0060] The LMFP material was mixed with the conductive paste obtained in the examples and comparative examples, stirred evenly, and coated on a 12 μm aluminum foil. The mixture was dried at 120°C for 12 hours to obtain a positive electrode sheet. The battery was assembled in the following order: battery case - placement of positive electrode sheet - dripping of electrolyte - placement of separator - dripping of electrolyte - placement of lithium sheet - placement of gasket and spring - battery case. The following tests were conducted:

[0061] (1) Use a charge and discharge tester (Xinwei) to perform 300 cycles of 0.5C charge and discharge test on the battery with a voltage range of 1.8-4.0V;

[0062] (2) Use a battery charge and discharge tester to test the battery at different rates (0.5C, 1C, 2C), with a voltage range of 2.5-4.1V;

[0063] (3) Cut the prepared positive electrode into strips of 10 mm × 40 mm, stick tape on one side of the electrode, fix the electrode with the lower clamp, fix the tape with the upper clamp, and measure the peel strength using a tensile testing machine; the data obtained are shown in the following table:

[0064]

[0065] Table 1

[0066] Conclusion: The conductive paste for lithium-ion battery positive electrodes provided by the present invention significantly improves battery performance through the synergistic effect of modified carbon nanotubes, graphene, and modified polymers. The capacity retention rates of Examples 1 to 3 after 300 cycles reached 88.8%, 89.1%, and 91.2%, respectively, significantly higher than those of Comparative Example 1 (72.4%) and Comparative Example 2 (71.6%). Rate performance tests showed that the discharge capacity retention rates of the Examples at 0.5C, 1C, and 2C were superior to those of the Comparative Examples, particularly at a rate of 2C, where 83.4% of the performance was retained, compared to only 71.8% for the Comparative Examples. Furthermore, the electrode peel strength of the Examples (34.8N) far exceeded that of the Comparative Examples (10.4N and 8.5N), indicating superior adhesion and mechanical stability. These results demonstrate that the three-dimensional conductive network formed by the covalent bonding of modified carbon nanotubes and polymers can effectively improve electron-ion conduction efficiency, cycle stability, and electrode structural integrity.

[0067] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0068] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A conductive paste for a lithium-ion battery positive electrode, characterized in that: The conductive paste comprises the following substances: 1-2 parts by weight of graphene, 4-5 parts of modified polymer, and 90-100 parts of N-methylpyrrolidone; The preparation process of the modified polymer comprises: mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methacrylic acid sulfonate, and deionized water, stirring at room temperature for 30-40 minutes, then introducing nitrogen to deoxygenate for 1-2 hours, then adding ammonium persulfate, raising the temperature to 60-70° C. under a protective atmosphere, reacting for 3-4 hours, then further raising the temperature to 90-100° C., reacting for 3-4 hours, and after the reaction is completed, filtering, washing, and drying to obtain the modified polymer; The preparation process of the modified carbon nanotubes is as follows: S1: Dissolve 4-aminophenol in a mixed solution of 37% hydrochloric acid and deionized water, cool to 0-5°C, then add sodium nitrite aqueous solution dropwise, stir at 0-5°C for 1-2 hours, then mix with 2-hydroxy-3-methoxybenzaldehyde, stir at room temperature overnight, filter, and recrystallize to obtain intermediate A; S2: Under protective atmosphere, intermediate A, 2-aminoimidazole, magnesium sulfate, and N,N-dimethylformamide were mixed, glacial acetic acid was added, the temperature was raised to 50-60°C, the reaction was carried out for 2-3 hours, and the mixture was filtered, washed, and dried to obtain intermediate B; S3: Mix intermediate B, triethylamine, and acetone, stir evenly, and slowly add 6-chloro-1-hexene dropwise. React at room temperature for 1-2 hours. After purification, obtain intermediate C. S4: Disperse the carboxylated carbon nanotubes in thionyl chloride, increase the temperature to 60-80°C, react for 24 hours, and dry to obtain chlorinated carbon nanotubes; under a protective atmosphere, mix the intermediate C with dichloromethane, cool to 0°C in an ice bath, slowly add pyridine, stir for 10-15 minutes, then add chlorinated carbon nanotubes, increase the temperature to 30-40°C, react for 2-4 hours, and post-treat to obtain modified carbon nanotubes.

2. The conductive paste for lithium-ion battery positive electrode according to claim 1, characterized in that: The modified polymer raw material comprises the following components: by weight, 1-2 parts of modified carbon nanotubes, 7-8 parts of acrylonitrile, 2.5-3.5 parts of methyl acrylate, 2-3 parts of sodium methyl propylene sulfonate, and 100-120 parts of deionized water.

3. The conductive paste for lithium-ion battery positive electrode according to claim 1, characterized in that: The intermediate A raw material includes the following components: by weight, 100-120 parts of 4-aminophenol, 150-180 parts of 37% hydrochloric acid, 200-250 parts of deionized water, 70-80 parts of sodium nitrite aqueous solution, and 160-170 parts of 2-hydroxy-3-methoxybenzaldehyde.

4. The conductive paste for lithium-ion battery positive electrode according to claim 1, characterized in that: The intermediate B raw material includes the following components: by weight, 100-120 parts of intermediate A, 60-70 parts of 2-aminoimidazole, 20-25 parts of magnesium sulfate, 300-350 parts of N,N-dimethylformamide, and 50-55 parts of glacial acetic acid.

5. The conductive paste for lithium-ion battery positive electrode according to claim 1, characterized in that: The intermediate C raw material includes the following components: by weight, 10-12 parts of intermediate B, 6-7 parts of triethylamine, 100-120 parts of acetone, and 12-13 parts of 6-chloro-1-hexene.

6. The conductive paste for lithium-ion battery positive electrode according to claim 1, characterized in that: In the acyl chloride carbon nanotubes, the mass ratio of the carboxylated carbon nanotubes to the thionyl chloride is 1:

3.

7. The conductive paste for lithium-ion battery positive electrode according to claim 1, characterized in that: The modified carbon nanotube raw material comprises the following components: by weight, 20-22 parts of intermediate C, 150-180 parts of dichloromethane, 7-9 parts of pyridine, and 10-12 parts of acyl chloride carbon nanotubes.

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