Conductive slurry for positive electrode of lithium ion battery

Abstract

The invention discloses conductive paste for a positive electrode of a lithium ion battery. Comprising the following substances in parts by weight: 1-2 parts of graphene, 4-5 parts of a modified polymer and 90-100 parts of N-methyl pyrrolidone, a preparation process of the modified polymer comprises the following steps: mixing modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methallyl sulfonate and deionized water, stirring at room temperature for 30-40 minutes, introducing nitrogen to remove oxygen for 1-2 hours, adding ammonium persulfate, raising the temperature to 60-70 DEG C in a protective atmosphere, reacting for 3-4 hours, continuously raising the temperature to 90-100 DEG C, reacting for 3-4 hours, and filtering after the reaction is finished to obtain the modified polymer. And washing and drying to obtain the modified polymer. The preparation method has the beneficial effects that the surface of the carbon nano tube is chemically modified, so that the carbon nano tube participates in the synthesis process of a modified polymer (polyacrylonitrile binder), and the slurry has good conductivity and stability in battery application.

Description

Technical Field

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

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

[0003] Currently, traditional conductive pastes mainly use conductive carbon black, carbon nanotubes, or graphene as conductive agents, and polymers such as polyvinylidene fluoride (PVDF) as binders. However, such pastes have obvious defects: First, there is usually only physical mixing between the conductive agent and the binder, lacking chemical bonding, resulting in a relatively high interfacial contact resistance and limited electron conduction efficiency; Second, during the charge and discharge process, the volume change of the electrode material is likely to break the conductive network, causing rapid capacity decay; In addition, traditional binders such as PVDF have insufficient adhesion to the active material, and the mechanical strength of the electrode sheet is poor, prone to peeling failure. Although carbon nanotubes and graphene can improve conductivity, due to their poor dispersibility and easy agglomeration, it is difficult to form a uniform and stable three-dimensional conductive network in practical applications. In the prior art, through simple physical modification or surfactant treatment methods, although some of the above problems can be alleviated, the core problems such as poor interfacial compatibility between the conductive agent and the polymer matrix and insufficient long-term cycle stability still cannot be fundamentally solved.

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

[0006] The purpose of the present invention can be achieved by the following technical solutions: A conductive paste for the positive electrode of a lithium-ion battery, comprising the following substances: by weight, 1 - 2 parts of graphene, 4 - 5 parts of modified polymer, and 90 - 100 parts of N-methylpyrrolidone; The preparation process of the modified polymer is as follows: Mix modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methallylsulfonate, and deionized water, stir at room temperature for 30 - 40 min, then pass nitrogen to remove oxygen for 1 - 2 h, then add ammonium persulfate, under a protective atmosphere, raise the temperature to 60 - 70 °C, react for 3 - 4 h, then continue to raise the temperature to 90 - 100 °C, react for 3 - 4 h. After the reaction is completed, filter, wash, and dry to obtain the modified polymer.

[0007] Preferably, 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 methallylsulfonate, and 100-120 parts of deionized water.

[0008] Preferably, 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 dropwise add an aqueous solution of sodium nitrite, stir at 0-5 °C for 1-2 h, then mix with 2-hydroxy-3-methoxybenzaldehyde, stir overnight at room temperature, filter, and recrystallize to obtain intermediate A; S2: Under a protective atmosphere, mix intermediate A, 2-aminoimidazole, magnesium sulfate, and N,N-dimethylformamide, add glacial acetic acid, raise the temperature to 50-60 °C, react for 2-3 h, filter, wash, and dry to obtain intermediate B; S3: Mix intermediate B, triethylamine, and acetone, stir evenly, then slowly dropwise add 6-chloro-1-hexene, react at room temperature for 1-2 h, and after purification, obtain intermediate C; S4: Disperse carboxylated carbon nanotubes in thionyl chloride, raise the temperature to 60-80 °C, react for 24 h, dry to obtain acyl chloride carbon nanotubes; under a protective atmosphere, mix intermediate C with dichloromethane, cool to 0 °C in an ice bath, slowly add pyridine, stir for 10-15 min, then add acyl chloride carbon nanotubes, raise the temperature to 30-40 °C, react for 2-4 h, and perform post-treatment to obtain modified carbon nanotubes.

[0009] In the scheme, 4-aminophenol reacts with sodium nitrite under acidic conditions to form a diazonium salt, and then undergoes a coupling reaction with 2-hydroxy-3-methoxybenzaldehyde to form intermediate A; the specific synthesis process is as follows: In the scheme, the aldehyde group of intermediate A and the amino group of 2-aminoimidazole undergo a nucleophilic addition and dehydration reaction under acidic conditions to form a Schiff base structure containing an imine bond (C=N), and magnesium sulfate acts as a water absorbent to promote the reaction equilibrium to shift towards the product direction, and finally intermediate B is obtained; the specific synthesis process is as follows: In the scheme, the nitrogen atom on the imidazole ring of intermediate B has a lone pair of electrons, which acts as a nucleophile to attack the carbon end of the carbon-chlorine bond (C-Cl) with partial positive charge in 6-chloro-1-hexene, resulting in the departure of the chloride ion and the formation of a new C-N bond, thereby obtaining intermediate C; the specific synthesis process is as follows: In the solution, the phenolic hydroxyl group contained in intermediate C acts as a nucleophile under alkaline conditions and attacks the carbonyl carbon with partial positive charge in the acyl chloride group, resulting in the departure of chloride ions and the formation of an ester bond, thereby covalently grafting intermediate C onto the surface of the carbon nanotubes.

[0010] More preferably, the raw materials of intermediate A include 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.

[0011] More preferably, the raw materials of intermediate B include 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.

[0012] More preferably, the raw materials of intermediate C include 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.

[0013] More preferably, in the acyl chlorinated carbon nanotubes, the mass ratio of carboxylated carbon nanotubes to thionyl chloride is 1:3.

[0014] More preferably, the raw materials of the modified carbon nanotubes include 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 chlorinated carbon nanotubes.

[0015] The beneficial effects of the present invention: By chemically modifying the surface of carbon nanotubes, the present invention enables them to participate in the synthesis process of the modified polymer (polyacrylonitrile binder), so that the slurry has good conductivity and stability in battery applications. Specifically as follows: Firstly: The imidazolium salt groups grafted on the surface of carbon nanotubes, due to their unique conjugated structure and positive charge characteristics, can effectively promote electron delocalization and significantly reduce the interfacial contact resistance. These imidazolium salt groups form covalent bonds with carbon nanotubes to construct a continuous electron transport channel, thereby greatly improving the overall conductivity of the system. At the same time, the surface-grafted azo groups, as efficient electron bridges, further enhance the hopping conduction ability of electrons between carbon nanotubes and the polymer matrix.

[0016] Second: The modified carbon nanotubes participate in the polymer synthesis through surface-grafted chemical molecules, and their unique one-dimensional electron conduction characteristics provide a long-range electron transport channel throughout the electrode. At the same time, the polymer molecular chains form short-range electron hopping paths between the 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 intramolecular electron delocalization, while the covalent connection between the carbon nanotubes and the polymer significantly reduces the interfacial contact resistance, enabling 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.

[0017] Third: The carbon nanotubes serve as a rigid skeleton and are covalently bonded to the conductive polymer to form a composite structure with both rigidity and flexibility. The high modulus characteristics of the carbon nanotubes effectively inhibit the macroscopic deformation of the electrode material, while the flexible polymer chains absorb and disperse local stress through ductility, buffering the volume change during the charge and discharge process of the electrode. 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 cycling performance of the electrode. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Example 1: A conductive paste for the positive electrode of a lithium-ion battery, comprising the following substances: by weight, 1 part of graphene, 4 parts of a modified polymer, and 90 parts of N-methylpyrrolidone; The preparation process of the modified polymer is as follows: Mix the modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methallylsulfonate, and deionized water, stir at room temperature for 30 minutes, then purge with nitrogen for 1 hour, then add ammonium persulfate, raise the temperature to 60 °C under a protective atmosphere, react for 3 hours, then continue to raise the temperature to 90 °C and react for 3 hours. After the reaction is completed, filter, wash, and dry to obtain the modified polymer; The preparation process of the modified carbon nanotubes is as follows: 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 dropwise add 70 parts of sodium nitrite aqueous solution, stir at 0 °C for 1 h, then mix with 160 parts of 2-hydroxy-3-methoxybenzaldehyde, stir overnight at room temperature, filter, and recrystallize to obtain intermediate A; S2: Under a protective atmosphere, mix 100 parts of intermediate A, 60 parts of 2-aminoimidazole, 20 parts of magnesium sulfate, and 300 parts of N,N-dimethylformamide, add 50 parts of glacial acetic acid, raise the temperature to 50 °C, react for 2 h, filter, wash, and dry to obtain intermediate B; S3: Mix 10 parts of intermediate B, 6 parts of triethylamine, and 100 parts of acetone, stir evenly, then slowly dropwise add 12 parts of 6-chloro-1-hexene, react at room temperature for 1 h, and after purification, obtain intermediate C; S4: Disperse 10 parts of carboxylated carbon nanotubes in thionyl chloride, raise the temperature to 60 °C, react for 24 h, and after drying, obtain 30 parts of acyl chloride 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 min, then add 10 parts of acyl chloride carbon nanotubes, raise the temperature to 30 °C, react for 2 h, and perform post-treatment to obtain modified carbon nanotubes.

[0020] Example 2: A conductive paste for the positive electrode of a lithium-ion battery, comprising the following substances: by weight, 2 parts of graphene, 5 parts of modified polymer, and 100 parts of N-methylpyrrolidone; The preparation process of the modified polymer is as follows: Mix modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methallylsulfonate, and deionized water, stir at room temperature for 40 min, then pass nitrogen to remove oxygen for 2 h, then add ammonium persulfate, under a protective atmosphere, raise the temperature to 70 °C, react for 4 h, then continue to raise the temperature to 100 °C, react for 4 h, after the reaction is completed, filter, wash, and dry to obtain the modified polymer; The preparation process of the modified carbon nanotubes is as follows: S1: Dissolve 120 parts of 4-aminophenol in a mixed solution of 180 parts of 37% hydrochloric acid and 250 parts of deionized water, cool to 5 °C, then dropwise add 80 parts of sodium nitrite aqueous solution, stir at 5 °C for 2 h, then mix with 170 parts of 2-hydroxy-3-methoxybenzaldehyde, stir overnight at room temperature, filter, and recrystallize to obtain intermediate A; S2: Under a protective atmosphere, mix 120 parts of intermediate A, 70 parts of 2-aminoimidazole, 25 parts of magnesium sulfate, and 350 parts of N,N-dimethylformamide, add 55 parts of glacial acetic acid, raise the temperature to 60 °C, react for 3 h, filter, wash, and dry to obtain intermediate B; S3: Mix 12 parts of intermediate B, 7 parts of triethylamine, and 120 parts of acetone. After stirring evenly, slowly add dropwise 13 parts of 6-chloro-1-hexene, react at room temperature for 2 h, and after purification, obtain intermediate C; S4: Disperse 10 parts of carboxylated carbon nanotubes in thionyl chloride, raise the temperature to 80 °C, react for 24 h, and after drying, obtain 30 parts of acyl chloride 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 min, then add 12 parts of acyl chloride carbon nanotubes, raise the temperature to 40 °C, react for 4 h, and perform post-treatment to obtain modified carbon nanotubes.

[0021] Example 3: A conductive paste for the positive electrode of a lithium-ion battery, comprising the following substances: by weight, 1.5 parts of graphene, 4.5 parts of modified polymer, and 95 parts of N-methylpyrrolidone; The preparation process of the modified polymer is as follows: Mix modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methallylsulfonate, and deionized water, stir at room temperature for 35 min, then pass nitrogen to remove oxygen for 1.5 h, then add ammonium persulfate, under a protective atmosphere, raise the temperature to 65 °C, react for 3.5 h, then continue to raise the temperature to 95 °C, react for 3.5 h, after the reaction is completed, filter, wash, and dry to obtain the modified polymer; The preparation process of the modified carbon nanotubes is as follows: S1: Dissolve 110 parts of 4-aminophenol in a mixed solution of 165 parts of 37% hydrochloric acid and 225 parts of deionized water, cool to 2.5 °C, then slowly add dropwise 75 parts of an aqueous sodium nitrite solution, stir at 2.5 °C for 1.5 h, then mix with 165 parts of 2-hydroxy-3-methoxybenzaldehyde, stir overnight at room temperature, filter, and recrystallize to obtain intermediate A; S2: Under a protective atmosphere, mix 110 parts of intermediate A, 65 parts of 2-aminoimidazole, 22.5 parts of magnesium sulfate, and 325 parts of N,N-dimethylformamide, add 52.5 parts of glacial acetic acid, raise the temperature to 55 °C, react for 2.5 h, filter, wash, and dry to obtain intermediate B; S3: Mix 11 parts of intermediate B, 6.5 parts of triethylamine, and 110 parts of acetone. After stirring evenly, slowly add dropwise 12.5 parts of 6-chloro-1-hexene, react at room temperature for 1.5 h, and after purification, obtain intermediate C; S4: Disperse 10 parts of carboxylated carbon nanotubes into thionyl chloride, raise the temperature to 70 °C, react for 24 h, and after drying, obtain 30 parts of acyl chloride 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 min, then add 11 parts of acyl chloride carbon nanotubes, raise the temperature to 35 °C, react for 3 h, and perform post-treatment to obtain modified carbon nanotubes.

[0022] Comparative Example 1: Without adding modified carbon nanotubes, the rest is the same as in Example 3, specifically as follows: A conductive paste for a lithium-ion battery cathode includes the following substances: by weight, 1.5 parts of graphene, 4.5 parts of modified polymer, and 95 parts of N-methylpyrrolidone; The preparation process of the modified polymer is as follows: Mix acrylonitrile, methyl acrylate, sodium methallyl sulfonate, and deionized water, stir at room temperature for 35 min, then pass nitrogen to remove oxygen for 1.5 h, then add ammonium persulfate, under a protective atmosphere, raise the temperature to 65 °C, react for 3.5 h, then continue to raise the temperature to 95 °C, react for 3.5 h, after the reaction ends, filter, wash, and dry to obtain the modified polymer.

[0023] Comparative Example 2: Use PVDF to replace the modified polymer, the rest is the same as in Example 3, specifically as follows: A conductive paste for a lithium-ion battery cathode includes the following substances: by weight, 1.5 parts of graphene, 4.5 parts of PVDF, and 95 parts of N-methylpyrrolidone.

[0024] Detection test: Mix the LMFP material with the conductive pastes obtained in the examples and comparative examples, stir evenly, coat on a 12-μm aluminum foil, dry at 120 °C for 12 h to obtain a positive electrode sheet, and assemble according to the assembly sequence of battery case - place the positive electrode sheet - drop the electrolyte - place the separator - drop the electrolyte - place the lithium sheet - place the spacer spring sheet - battery case to obtain a battery. Conduct the following tests: (1) Use a charge-discharge tester (Neware) to perform a 300-cycle 0.5C charge-discharge test on the battery, with a voltage range of 1.8 - 4.0 V; (2) Use a battery charge-discharge tester to perform charge-discharge tests on the battery at different rates (0.5C, 1C, 2C), with a voltage range of 2.5 - 4.1 V; (3) Cut the prepared positive electrode sheet into a strip shape of 10 mm × 40 mm, stick a tape on one side of the electrode sheet, fix the electrode sheet with the lower clamp, fix the tape with the upper clamp, and use a tensile testing machine to measure the peel strength; the data obtained are shown in the following table: Table 1 Conclusion: The conductive paste for the positive electrode of the lithium-ion battery provided by the present invention significantly improves the battery performance through the synergistic effect of modified carbon nanotubes, graphene, and modified polymers. Among them, the capacity retention rates of Examples 1 to 3 after 300 cycles reached 88.8%, 89.1%, and 91.2% respectively, which are much higher than those of Comparative Example 1 (72.4%) and Comparative Example 2 (71.6%); the rate performance test shows that the discharge capacity retention rates of the examples at 0.5C, 1C, and 2C are all better than those of the comparative examples. Especially at a rate of 2C, the performance can still be maintained at 83.4%, while that of the comparative example is only 71.8%; in addition, the stripping strength of the electrode of the example (34.8 N) far exceeds that of the comparative examples (10.4 N and 8.5 N), indicating that its adhesiveness and mechanical stability are better. These results prove that the three-dimensional conductive network formed by the covalent binding of modified carbon nanotubes and polymers can effectively improve the electron-ion conduction efficiency, cycle stability, and electrode structure integrity.

[0025] In the description of the specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0026] The above content is only an example and illustration of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should all belong to the protection scope 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: by weight, 1-2 parts of graphene, 4-5 parts of modified polymer, and 90-100 parts of N-methylpyrrolidone; The preparation process of the modified polymer is as follows: modified carbon nanotubes, acrylonitrile, methyl acrylate, sodium methyl acrylate sulfonate and deionized water are mixed, stirred at room temperature for 30-40 minutes, then nitrogen is introduced for deoxygenation for 1-2 hours, then ammonium persulfate is added, and under a protective atmosphere, the temperature is increased to 60-70° C., reacted for 3-4 hours, and then the temperature is continued to be increased to 90-100° C., reacted for 3-4 hours, and after the reaction is completed, filtered, washed and dried to obtain the modified polymer.

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 acrylate 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 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 1-2h, then mix with 2-hydroxy-3-methoxybenzaldehyde, stir at room temperature overnight, filter, and recrystallize to obtain intermediate A; S2: Under a protective atmosphere, intermediate A, 2-aminoimidazole, magnesium sulfate, and N,N-dimethylformamide are mixed, glacial acetic acid is added, the temperature is raised to 50-60°C, the reaction is carried out for 2-3 hours, and the intermediate B is obtained after filtering, washing, and drying. S3: Mix intermediate B, triethylamine and acetone, stir evenly, slowly add 6-chloro-1-hexene, react at room temperature for 1-2 hours, and purify to obtain intermediate C; S4: Disperse the carboxylated carbon nanotubes in thionyl chloride, increase the temperature to 60-80°C, react for 24 hours, and obtain chlorinated carbon nanotubes after drying; 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.

4. The conductive paste for lithium ion battery positive electrode according to claim 3, characterized in that: The intermediate A raw material comprises 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.

5. The conductive paste for lithium ion battery positive electrode according to claim 3, characterized in that: The intermediate B raw material comprises 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.

6. The conductive paste for lithium ion battery positive electrode according to claim 3, characterized in that: The intermediate C raw material comprises 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.

7. The conductive paste for lithium ion battery positive electrode according to claim 3, characterized in that: In the acyl chloride carbon nanotubes, the mass ratio of the carboxyl carbon nanotubes to the thionyl chloride is 1:

3.

8. The conductive paste for lithium ion battery positive electrode according to claim 3, 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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