Molybdenum copper oxide / carbon nanotube fiber material preparation method, product and application

Abstract

The invention provides a preparation method of a molybdenum-copper oxide / carbon nanotube fiber negative electrode material and a product and application thereof. The preparation method comprises the following steps: dissolving a soluble molybdenum source, a copper source, organic alcohol and terephthalic acid in a dimethylformamide solution; magnetically stirring for 1-2 hours until the solution is uniform to obtain a solution A; transferring the solution A into a reaction kettle to react at 160-180 DEG C for 8-10 hours, cooling to room temperature, washing with deionized water and an organic solvent for 3-5 times, and drying in a drying oven at 60-80 DEG C overnight to obtain a precursor B; and putting the precursor B into a muffle furnace, heating to 600-800 DEG C at a heating rate of 2-5 DEG C / min, calcining, and keeping the temperature for 2-4 hours to obtain the molybdenum-copper oxide / carbon nanotube fiber. Under the condition of the current density of 100 mA / g, the first specific discharge capacity is 1675 mAh / g, the second specific discharge capacity is 1560 mAh / g, the specific discharge capacity is 1162 mAh / g after circulation for 5 times, the specific discharge capacity is 990 mAh / g after circulation for 100 times, and the capacity retention ratio is 85.2% compared with the fifth specific discharge capacity.

Description

Technical Field

[0001] This invention relates to a method for preparing a lithium-ion battery anode material, and particularly to a method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material, as well as its products and applications, belonging to the field of energy materials. Background Technology

[0002] With technological advancements, lithium-ion batteries will be widely used in electric vehicles, aerospace, and biomedicine. Therefore, the research and development of power lithium-ion batteries and related materials is of great significance. For power lithium-ion batteries, the key is to improve power density and energy density, and the fundamental solution to improving power density and energy density lies in electrode materials, especially the improvement of negative electrode materials.

[0003] Carbon materials were among the first materials studied and commercialized for lithium-ion batteries, and they remain a focus of research and attention. However, carbon anode materials have some drawbacks: during battery formation, they react with the electrolyte to form an SEI film, leading to electrolyte consumption and a lower initial coulombic efficiency; during overcharging, metallic lithium may deposit on the carbon electrode surface, forming lithium dendrites that cause short circuits, resulting in increased temperature and potential battery explosion; furthermore, the low diffusion coefficient of lithium ions in carbon materials prevents the battery from achieving high-current charging and discharging, thus limiting the application range of lithium-ion batteries.

[0004] MoCuO3 is a layered composite oxide and a widely used magnetic material. It can also be used as a negative electrode material for lithium-ion batteries. Through conversion and alloying reactions, it exhibits high Li-strength properties. + Storage capacity. This material is considered a promising lithium-ion anode material. However, its application is limited by drawbacks such as large volume change and low conductivity during charge and discharge.

[0005] This invention provides a method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material. This method combines molybdenum copper oxide with carbon nanotube fibers. The combination of carbon nanotube fibers and molybdenum copper oxide further improves the material's conductivity and prevents volume expansion and structural collapse, thereby enhancing the material's electrochemical performance. This preparation process is relatively simple and easy to operate. Summary of the Invention

[0006] To overcome the shortcomings of existing molybdenum copper oxide materials, such as low conductivity and volume expansion, the present invention aims to provide a method for preparing molybdenum copper oxide / carbon nanotube fiber anode materials.

[0007] Another objective of this invention is to provide a molybdenum copper oxide / carbon nanotube fiber anode material product obtained by the above method.

[0008] Another object of the present invention is to provide an application of the above-mentioned product.

[0009] The objective of this invention is achieved through the following method: a method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material, characterized by the following specific steps: 1) Dissolve a soluble molybdenum source, a copper source, an organic alcohol, and terephthalic acid in a dimethylformamide solution, wherein the mass ratio of the soluble molybdenum source, copper source, organic alcohol, and terephthalic acid is 2:2:2:1; stir magnetically for 1 to 2 hours until homogeneous to obtain solution A; 2) Transfer A to a reaction vessel and react at 160-180 ℃ for 8-10 h. Cool to room temperature, wash 3-5 times with deionized water and organic solvent, and dry overnight in an oven at 60-80 ℃ to obtain precursor B. 3) Place precursor B in a muffle furnace and calcine it to 600-800 ℃ at a heating rate of 2-5 ℃ / min, and hold for 2-4 h to obtain molybdenum copper oxide / carbon nanotube fibers.

[0010] The molybdenum source is one or a combination of ammonium molybdate, sodium molybdate, or potassium molybdate.

[0011] The copper source is one or a combination of copper acetate, copper nitrate, or copper chloride.

[0012] The organic alcohol is one of octanol, hexanol, butanol, or a combination thereof.

[0013] The organic solvent is one of acetone or ethanol, or a combination thereof.

[0014] This invention provides a molybdenum copper oxide / carbon nanotube fiber anode material, which is prepared according to any of the methods described above.

[0015] This invention provides an application of a molybdenum copper oxide / carbon nanotube fiber anode material in lithium-ion battery anodes.

[0016] Beneficial effects: This invention provides a method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material. This method combines molybdenum copper oxide with carbon nanotube fibers. The combination of carbon nanotube fibers and molybdenum copper oxide further improves the material's conductivity and prevents volume expansion and structural collapse, thereby enhancing the material's electrochemical performance. This preparation process is relatively simple and easy to operate. Attached Figure Description

[0017] Figure 1 The cycle life diagram is for the molybdenum copper oxide / carbon nanotube fiber anode material in Example 1. Detailed Implementation

[0018] The present invention will be described in detail through the following specific examples, but the scope of protection of the present invention is not limited to these embodiments.

[0019] Example 1 A molybdenum copper oxide / carbon nanotube fiber anode material is prepared according to the following steps: 1) Dissolve soluble ammonium molybdate, copper acetate, butanol and terephthalic acid in dimethylformamide solution, wherein the mass ratio of soluble ammonium molybdate, copper acetate, octanol and terephthalic acid is 2:2:2:1; stir magnetically for 1 h until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 160 °C for 10 h. Cool to room temperature, wash three times with deionized water and organic solvent ethanol, and dry in an oven at 80 °C overnight to obtain precursor B. 3) Precursor B was placed in a muffle furnace and heated to 600 °C at a heating rate of 2 °C / min, and held for 4 h to obtain molybdenum copper oxide / carbon nanotube fibers.

[0020] Figure 1 This is a cycle life graph of the molybdenum copper oxide / carbon nanotube fiber anode material. Under a current density of 100 mA / g, the initial discharge specific capacity is 1675 mAh / g, the second discharge specific capacity is 1560 mAh / g, the discharge specific capacity after 5 cycles is 1162 mAh / g, and the discharge specific capacity after 100 cycles is 990 mAh / g. Compared with the 5th cycle, the capacity retention rate is 85.2%.

[0021] Example 2 A molybdenum copper oxide / carbon nanotube fiber anode material is prepared according to the following steps: 1) Dissolve soluble sodium molybdate, copper nitrate, hexanol, and terephthalic acid in dimethylformamide solution, wherein the mass ratio of soluble sodium molybdate, copper nitrate, hexanol, and terephthalic acid is 2:2:2:1; stir magnetically for 2 h until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 180 °C for 8 h. Cool to room temperature, wash three times with deionized water and organic solvent acetone, and dry overnight in an oven at 80 °C to obtain precursor B. 3) Precursor B was placed in a muffle furnace and heated to 700 °C at a heating rate of 3 °C / min, and held for 3 h to obtain molybdenum copper oxide / carbon nanotube fibers.

[0022] Example 3 A molybdenum copper oxide / carbon nanotube fiber anode material is prepared according to the following steps: 1) Dissolve soluble potassium molybdate, copper chloride, octanol and terephthalic acid in dimethylformamide solution, wherein the mass ratio of soluble potassium molybdate, copper chloride, octanol and terephthalic acid is 2:2:2:1; stir magnetically for 1 h until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 160 °C for 10 h. Cool to room temperature, wash 5 times with deionized water and organic solvent, and dry overnight in an oven at 60 °C to obtain precursor B. Precursor B was placed in a muffle furnace and calcined at 800 °C with a heating rate of 5 °C / min, and held at that temperature for 2 h to obtain molybdenum copper oxide / carbon nanotube fibers.

Claims

1. A method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material, characterized in that, Includes the following steps: 1) Dissolve a soluble molybdenum source, a copper source, an organic alcohol, and terephthalic acid in a dimethylformamide solution, wherein the mass ratio of the soluble molybdenum source, copper source, organic alcohol, and terephthalic acid is 2:2:2:1; stir magnetically for 1 to 2 hours until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 160-180 ℃ for 8-10 h. Cool to room temperature, wash 3-5 times with deionized water and organic solvent, and dry overnight in an oven at 60-80 ℃ to obtain precursor B. 3) Place precursor B in a muffle furnace and calcine it to 600-800 ℃ at a heating rate of 2-5 ℃ / min, and hold for 2-4 h to obtain molybdenum copper oxide / carbon nanotube fibers.

2. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to claim 1, characterized in that... The molybdenum source is one or a combination of ammonium molybdate, sodium molybdate, or potassium molybdate.

3. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to claim 1, characterized in that... The copper source is one or a combination of copper acetate, copper nitrate, or copper chloride.

4. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to claim 1, characterized in that... The organic alcohol is one of octanol, hexanol, butanol, or a combination thereof.

5. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to claim 1, characterized in that... The organic solvent is one of acetone or ethanol, or a combination thereof.

6. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to any one of claims 1 to 5, characterized in that... Prepare according to the following steps: 1) Dissolve soluble ammonium molybdate, copper acetate, butanol, and terephthalic acid in dimethylformamide solution, wherein the mass ratio of soluble ammonium molybdate, copper acetate, octanol, and terephthalic acid is 2:2:2:1; stir magnetically for 1 h until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 160 °C for 10 h. Cool to room temperature, wash three times with deionized water and organic solvent ethanol, and dry overnight in an oven at 80 °C to obtain precursor B. 3) Precursor B was placed in a muffle furnace and heated to 600 °C at a heating rate of 2 °C / min, and held for 4 h to obtain molybdenum copper oxide / carbon nanotube fibers.

7. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to any one of claims 1 to 5, characterized in that... Prepare according to the following steps: 1) Dissolve soluble sodium molybdate, copper nitrate, hexanol, and terephthalic acid in dimethylformamide solution, wherein the mass ratio of soluble sodium molybdate, copper nitrate, hexanol, and terephthalic acid is 2:2:2:1; stir magnetically for 2 h until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 180 °C for 8 h. Cool to room temperature, wash three times with deionized water and organic solvent acetone, and dry overnight in an oven at 80 °C to obtain precursor B. 3) Precursor B was placed in a muffle furnace and heated to 700 °C at a heating rate of 3 °C / min, and held for 3 h to obtain molybdenum copper oxide / carbon nanotube fibers.

8. The method for preparing a molybdenum copper oxide / carbon nanotube fiber anode material according to any one of claims 1 to 5, characterized in that... Prepare according to the following steps: 1) Dissolve soluble potassium molybdate, copper chloride, octanol, and terephthalic acid in dimethylformamide solution, wherein the mass ratio of soluble potassium molybdate, copper chloride, octanol, and terephthalic acid is 2:2:2:1; stir magnetically for 1 h until homogeneous to obtain solution A; 2) Transfer solution A to a reaction vessel and react at 160 °C for 10 h. Cool to room temperature, wash 5 times with deionized water and organic solvent, and dry overnight in an oven at 60 °C to obtain precursor B. Precursor B was placed in a muffle furnace and calcined at 800 °C with a heating rate of 5 °C / min, and held at that temperature for 2 h to obtain molybdenum copper oxide / carbon nanotube fibers.

9. A molybdenum copper oxide / carbon nanotube fiber anode material, characterized in that... Prepared by the method according to any one of claims 1-8.

10. The application of the molybdenum copper oxide / carbon nanotube fiber anode material according to claim 9 in the anode of a lithium-ion battery.

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