CN113839035A - Lithium ion battery negative electrode material based on multiwalled carbon nanotube and preparation method thereof - Google Patents
Lithium ion battery negative electrode material based on multiwalled carbon nanotube and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a lithium ion battery cathode material based on a multiwalled carbon nanotube and a preparation method thereof. The preparation method comprises the following steps: (1) putting the multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 2-4 h at 50-70 ℃, washing to be neutral, and drying to obtain a nitrated multi-walled carbon nanotube; (2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and performing ultrasonic dispersion for 20-30 min at the temperature of 70-90 ℃ to obtain nitrated multi-walled carbon nanotube slurry; (3) adding polyvinyl alcohol and a catalyst into the nitrated multi-walled carbon nanotube slurry, stirring and reacting for 2-4 h at the temperature of 70-90 ℃, and filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube; (4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20-30 min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material. The cathode material improves the cycle efficiency of the lithium ion battery in the application process and improves the capacity of the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of preparation of lithium ion battery cathode materials, in particular to a lithium ion battery cathode material based on multi-walled carbon nanotubes and a preparation method thereof.
Background
The negative electrode of the lithium ion battery is formed by uniformly coating a paste adhesive prepared by mixing a negative electrode active material carbon material or non-carbon material, a binder and an additive on two sides of a copper foil, drying and rolling. The negative electrode material mainly influences the first efficiency, the cycle performance and the like of the lithium ion battery, the performance of the negative electrode material also directly influences the performance of the lithium ion battery, and the negative electrode material accounts for about 5-15% of the total cost of the lithium ion battery. With the progress of technology, the current lithium ion battery cathode material has been developed from single artificial graphite to a situation that natural graphite, mesocarbon microbeads and artificial graphite are mainly used, and a plurality of cathode materials such as soft carbon/hard carbon, amorphous carbon, graphene, carbon nanotubes, lithium titanate and silicon carbon alloy coexist.
Disclosure of Invention
The invention aims to solve the primary technical problem of providing a preparation method of a lithium ion battery cathode material based on a multi-walled carbon nanotube. The lithium ion battery cathode material based on the multiwalled carbon nanotube prepared by the method has excellent cycle performance.
The technical problem to be solved by the invention is realized by the following technical scheme:
a preparation method of a lithium ion battery anode material based on a multiwalled carbon nanotube comprises the following steps:
(1) putting the multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 2-4 h at 50-70 ℃, washing to be neutral, and drying to obtain a nitrated multi-walled carbon nanotube;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and performing ultrasonic dispersion for 20-30 min at the temperature of 70-90 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
(3) adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring and reacting for 2-4 h at 70-90 ℃, filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20-30 min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material.
Preferably, the nitrating agent in the step (1) is composed of acetic anhydride and concentrated nitric acid according to a volume ratio of 2-3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 15-30 mL.
Most preferably, the nitrating agent in step (1) consists of acetic anhydride and concentrated nitric acid in a volume ratio of 3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 20 mL.
Preferably, the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water in the step (2) is as follows: 1g: 0.1-0.2 g: 10-20 mL.
Most preferably, the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water in the step (2) is as follows: 1g: 0.15 g:15 mL.
Preferably, the dispersant is prepared by the following method: adding oleic acid and tetrafluoroboric acid into an organic solvent, then adding a sodium hydroxide solution, reacting for 1-2 hours at the temperature of 60-70 ℃, and concentrating to remove the solvent to obtain the dispersing agent; the molar ratio of the oleic acid, the tetrafluoroboric acid and the sodium hydroxide is 1:1: 2.
Preferably, the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry in the step (3) is as follows: 1-3 g: 2-3 g: 2-4 g: 100-200 mL.
Most preferably, the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-wall carbon nanotube slurry is as follows: 2 g:2 g:3 g: 150 mL.
Preferably, the weight usage ratio of the polyvinyl alcohol modified multi-walled carbon nanotubes to the artificial graphite in the step (4) is 1: 5-50.
Most preferably, the weight ratio of the polyvinyl alcohol modified multi-wall carbon nano-tubes to the artificial graphite in the step (4) is 1: 20.
Preferably, the dosage ratio of the total weight of the polyvinyl alcohol modified multi-walled carbon nanotube and the artificial graphite to the deionized water in the step (4) is 1g: 15-30 mL.
Preferably, the multi-walled carbon nanotube is: a multi-walled carbon nanotube having a diameter of 10 to 15 nm and a length of 2 to 10 μm.
The invention also provides the lithium ion battery cathode material based on the multi-walled carbon nano tube, which is prepared by the preparation method.
Has the advantages that: the invention provides a brand new preparation method of a lithium ion battery cathode material, and the lithium ion battery cathode material is added with polyvinyl alcohol modified multi-walled carbon nanotubes and artificial graphite, so that the polyvinyl alcohol modified multi-walled carbon nanotubes and the artificial graphite form a complex conductive network in the preparation process, the cycle efficiency of a lithium ion battery is greatly improved in the application process, and the service life of the lithium ion battery is prolonged; furthermore, the dispersing agent prepared in the brand new way is added in the preparation process of the polyvinyl alcohol modified multi-walled carbon nanotube, so that the agglomeration of the nitrated multi-walled carbon nanotube in the preparation process of the polyvinyl alcohol modified multi-walled carbon nanotube can be effectively avoided, the reaction of the nitrated multi-walled carbon nanotube and polyvinyl alcohol is promoted, and the polyvinyl alcohol modified multi-walled carbon nanotube with higher performance for preparing the battery cathode material is obtained; in addition, the capacity of the negative electrode material can be effectively improved by adding the polyvinyl alcohol modified multi-walled carbon nano-tube.
Detailed Description
The present invention is further explained below with reference to specific examples, which are not intended to limit the present invention in any way.
Example 1 preparation method of lithium ion battery negative electrode material based on multiwalled carbon nanotube
(1) Putting the single-walled multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 3 hours at the temperature of 60 ℃, washing to be neutral, and drying to obtain the nitrated multi-walled carbon nanotube;
the nitrating agent consists of acetic anhydride and concentrated nitric acid according to the volume ratio of 3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 20 mL;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and performing ultrasonic dispersion for 20min at 80 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water is as follows: 1g: 0.15 g:15 mL; the dispersant is prepared by the following method: adding oleic acid and tetrafluoroboric acid into an organic solvent, then adding a sodium hydroxide solution, reacting for 2 hours at 70 ℃, and concentrating to remove the solvent to obtain the dispersing agent; the molar ratio of the oleic acid, the tetrafluoroboric acid and the sodium hydroxide is 1:1: 2.
(3) Adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring at 90 ℃ for reaction for 3 hours, filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube; the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry is as follows: 2 g:2 g:3 g: 150 mL;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material;
the weight using amount ratio of the polyvinyl alcohol modified multi-walled carbon nano-tube to the artificial graphite is 1: 20; the dosage ratio of the total weight of the polyvinyl alcohol modified multi-wall carbon nano-tube and the artificial graphite to the deionized water is 1g:25 mL.
Example 2 preparation method of lithium ion battery negative electrode material based on multiwalled carbon nanotube
(1) Putting the single-walled multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 4 hours at 50 ℃, washing to be neutral, and drying to obtain the nitrated multi-walled carbon nanotube;
the nitrating agent consists of acetic anhydride and concentrated nitric acid according to the volume ratio of 2: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g:15 mL;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and ultrasonically stirring for 30min at 70 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water is as follows: 1g: 0.1 g: 10 mL; the dispersant is prepared by the following method: adding oleic acid and tetrafluoroboric acid into an organic solvent, then adding a sodium hydroxide solution, reacting for 2 hours at 70 ℃, and concentrating to remove the solvent to obtain the dispersing agent; the molar ratio of the oleic acid, the tetrafluoroboric acid and the sodium hydroxide is 1:1: 2.
(3) Adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring and reacting for 4 hours at the temperature of 80 ℃, and filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube; the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry is as follows: 1g:2 g:3 g: 100 mL;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material;
the weight using amount ratio of the polyvinyl alcohol modified multi-walled carbon nano-tube to the artificial graphite is 1: 10; the dosage ratio of the total weight of the polyvinyl alcohol modified multi-wall carbon nano-tube and the artificial graphite to the deionized water is 1g:15 mL.
Example 3 preparation method of lithium ion battery negative electrode material based on multiwalled carbon nanotube
(1) Putting the single-walled multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 2 hours at 70 ℃, washing to be neutral, and drying to obtain the nitrated multi-walled carbon nanotube;
the nitrating agent consists of acetic anhydride and concentrated nitric acid according to the volume ratio of 3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g:30 mL;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and ultrasonically stirring for 30min at 70 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water is as follows: 1g: 0.2 g: 20 mL; the dispersant is prepared by the following method: adding oleic acid and tetrafluoroboric acid into an organic solvent, then adding a sodium hydroxide solution, reacting for 2 hours at 70 ℃, and concentrating to remove the solvent to obtain the dispersing agent; the molar ratio of the oleic acid, the tetrafluoroboric acid and the sodium hydroxide is 1:1: 2.
(3) Adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring and reacting for 4 hours at the temperature of 80 ℃, and filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube; the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry is as follows: 3 g:2 g:3 g: 200 mL;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 30min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material;
the weight using amount ratio of the polyvinyl alcohol modified multi-walled carbon nano-tube to the artificial graphite is 1: 25; the dosage ratio of the total weight of the polyvinyl alcohol modified multi-wall carbon nano-tube and the artificial graphite to the deionized water is 1g:30 mL.
Comparative example 1 preparation method of lithium ion battery negative electrode material based on multiwalled carbon nanotube
(1) Putting the single-walled multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 3 hours at the temperature of 60 ℃, washing to be neutral, and drying to obtain the nitrated multi-walled carbon nanotube;
the nitrating agent consists of acetic anhydride and concentrated nitric acid according to the volume ratio of 3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 20 mL;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, and ultrasonically dispersing for 20min at 80 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water is as follows: 1g:15 mL;
(3) adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring at 90 ℃ for reaction for 3 hours, filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube; the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry is as follows: 2 g:2 g:3 g: 150 mL;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material;
the weight using amount ratio of the polyvinyl alcohol modified multi-walled carbon nano-tube to the artificial graphite is 1: 20; the dosage ratio of the total weight of the polyvinyl alcohol modified multi-wall carbon nano-tube and the artificial graphite to the deionized water is 1g:25 mL.
Comparative example 1 differs from example 1 in that no dispersant was added in the preparation step of the nitrated multi-walled carbon nanotube slurry of step (2).
Comparative example 2 preparation method of lithium ion battery negative electrode material based on multiwalled carbon nanotube
(1) Putting the single-walled multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 3 hours at the temperature of 60 ℃, washing to be neutral, and drying to obtain the nitrated multi-walled carbon nanotube;
the nitrating agent consists of acetic anhydride and concentrated nitric acid according to the volume ratio of 3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 20 mL;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and performing ultrasonic dispersion for 20min at 80 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water is as follows: 1g: 0.15 g:15 mL; the dispersant is ethylenediamine-di-o-phenyl sodium acetate.
(3) Adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring at 90 ℃ for reaction for 3 hours, filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube; the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry is as follows: 2 g:2 g:3 g: 150 mL;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material;
the weight using amount ratio of the polyvinyl alcohol modified multi-walled carbon nano-tube to the artificial graphite is 1: 20; the dosage ratio of the total weight of the polyvinyl alcohol modified multi-wall carbon nano-tube and the artificial graphite to the deionized water is 1g:25 mL.
Comparative example 2 differs from example 1 in that the nitrated multiwalled carbon nanotube slurry of step (2) was prepared using a conventional dispersant, ethylenediamine-dipheny-l sodium acetate; and example 1 adopts a completely new method to prepare the obtained dispersant.
Examples of the experiments
Mixing the multi-walled carbon nanotube-based lithium ion battery negative electrode material prepared in the examples 1-3 and the comparative examples 1 and 2 with a binder, adding the mixture into 1-methyl-2-pyrrolidone, uniformly stirring to obtain slurry, coating the slurry on a copper foil, drying and rolling to prepare an electrode; wherein the weight ratio of the lithium ion battery cathode material based on the multiwalled carbon nanotube to the binder is 8: 1.
lithium cobaltate is selected as a positive electrode, ethylene carbonate, propylene carbonate and diethyl carbonate in a volume ratio of 1:1:1 are used as electrolyte, a polyimide film is selected as a diaphragm to assemble a simulation battery, and the simulation battery is stood for 24 hours to test the electrochemical performance of the lithium ion battery negative electrode material based on the multiwalled carbon nanotube;
the test results are shown in Table 1.
TABLE 1 Electrical Properties of lithium ion battery cathode materials based on multiwall carbon nanotubes
| Test object | Capacity mAh/g | 1000 cycle efficiency |
| Example 1 lithium ion battery negative electrode material prepared | 760 | 97％ |
| Example 2 lithium ion battery negative electrode material | 677 | 92％ |
| Example 3 negative electrode Material for lithium ion Battery | 649 | 91％ |
| Lithium ion battery cathode material prepared in comparative example 1 | 342 | 78％ |
| Comparative example 2 prepared lithium ion battery negative electrode material | 531 | 82％ |
From the results of the electrical property tests in table 1, it can be seen that the lithium ion battery negative electrode materials based on the multi-walled carbon nanotubes prepared in examples 1 to 3 all have a capacity of more than 600mAh/g and a cycle efficiency of more than 90%; the battery cathode material has higher capacity and cycle efficiency by adding the polyvinyl alcohol modified multi-walled carbon nano-tube, and can improve the capacity and service life of the lithium ion battery. In particular, the lithium ion battery negative electrode material based on the multi-walled carbon nanotube prepared in example 1 has the highest capacity and cycle efficiency, which indicates that the lithium ion battery negative electrode material based on the multi-walled carbon nanotube prepared in example 1 has the best electrical properties under the condition parameters.
From the experimental data of example 1 and comparative example 1, it can be seen that the capacity and the cycle efficiency of the lithium ion battery anode material based on the multi-walled carbon nanotube prepared in example 1 are much higher than those of comparative example 1. The fact shows that the dispersing agent is added in the process of preparing the polyvinyl alcohol modified multi-walled carbon nano tube, so that the capacity and the cycle efficiency of the lithium ion battery negative electrode material can be effectively improved.
From the experimental data of example 1 and comparative example 2, it can be seen that the capacity and the cycle efficiency of the lithium ion battery anode material based on the multi-walled carbon nanotube prepared in example 1 are higher than those of comparative example 2. The fact shows that the dispersing agent prepared by the method is added in the process of preparing the polyvinyl alcohol modified multi-wall carbon nano tube, and the capacity and the cycle efficiency of the battery negative electrode material are improved more obviously than those of the conventional dispersing agent.
Claims (9)
1. A preparation method of a lithium ion battery cathode material based on a multiwalled carbon nanotube is characterized by comprising the following steps:
(1) putting the multi-walled carbon nanotube into a nitrating agent solution, ultrasonically stirring for 2-4 h at 50-70 ℃, washing to be neutral, and drying to obtain a nitrated multi-walled carbon nanotube;
(2) adding the nitrated multi-walled carbon nanotube into deionized water, then adding a dispersant, and performing ultrasonic dispersion for 20-30 min at the temperature of 70-90 ℃ to obtain nitrated multi-walled carbon nanotube slurry;
(3) adding polyvinyl alcohol, sodium thiocyanate and triethylamine into the nitrated multi-walled carbon nanotube slurry, stirring and reacting for 2-4 h at 70-90 ℃, filtering and drying to obtain a polyvinyl alcohol modified multi-walled carbon nanotube;
(4) adding polyvinyl alcohol modified multi-walled carbon nanotubes into deionized water, then adding artificial graphite, performing ultrasonic dispersion for 20-30 min, filtering, and drying the solid to obtain the multi-walled carbon nanotube-based lithium ion battery negative electrode material.
2. The preparation method according to claim 1, wherein the nitrating agent in the step (1) is composed of acetic anhydride and concentrated nitric acid in a volume ratio of 2-3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 15-30 mL;
most preferably, the nitrating agent in step (1) consists of acetic anhydride and concentrated nitric acid in a volume ratio of 3: 1; the dosage ratio of the multi-wall carbon nano tube to the nitrating agent is 1g: 20 mL.
3. The preparation method of claim 1, wherein the amount of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water in the step (2) is as follows: 1g: 0.1-0.2 g: 10-20 mL;
most preferably, the dosage ratio of the nitrated multi-walled carbon nanotube, the dispersant and the deionized water in the step (2) is as follows: 1g: 0.15 g:15 mL.
4. The method according to claim 1, wherein the dispersant is prepared by: adding oleic acid and tetrafluoroboric acid into an organic solvent, then adding a sodium hydroxide solution, reacting for 1-2 hours at the temperature of 60-70 ℃, and concentrating to remove the solvent to obtain the dispersing agent; the molar ratio of the oleic acid, the tetrafluoroboric acid and the sodium hydroxide is 1:1: 2.
5. The preparation method according to claim 1, wherein the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-walled carbon nanotube slurry in the step (3) are used in the following ratio: 1-3 g: 2-3 g: 2-4 g: 100-200 mL;
most preferably, the dosage ratio of the polyvinyl alcohol, the sodium thiocyanate, the triethylamine and the nitrated multi-wall carbon nanotube slurry is as follows: 2 g:2 g:3 g: 150 mL.
6. The preparation method according to claim 1, wherein the weight ratio of the polyvinyl alcohol modified multi-walled carbon nanotubes to the artificial graphite in the step (4) is 1: 5-50;
most preferably, the weight ratio of the polyvinyl alcohol modified multi-wall carbon nano-tubes to the artificial graphite in the step (4) is 1: 20.
7. The preparation method according to claim 1, wherein the ratio of the total weight of the polyvinyl alcohol modified multi-walled carbon nanotubes and the artificial graphite in the step (4) to the amount of deionized water is 1g: 15-30 mL.
8. The method of claim 1, wherein the multi-walled carbon nanotubes are: a multi-walled carbon nanotube having a diameter of 10 to 15 nm and a length of 2 to 10 μm.
9. The lithium ion battery anode material based on the multi-walled carbon nanotubes prepared by the preparation method of any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115646447A (en) * | 2022-11-09 | 2023-01-31 | 北京大学 | Preparation method and application of carbon microsphere/titanate composite adsorption material |
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| CN115646447A (en) * | 2022-11-09 | 2023-01-31 | 北京大学 | Preparation method and application of carbon microsphere/titanate composite adsorption material |
| CN115646447B (en) * | 2022-11-09 | 2023-12-22 | 北京大学 | Preparation method and application of carbon microsphere/titanate composite adsorption material |
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