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A method for preparing a novel sodium-ion battery negative-electrode material

A negative electrode material and sodium electricity technology, which is applied in the field of preparation of novel sodium electricity negative electrode materials, can solve the problems of low preparation efficiency, many chemical reagents, cycle deterioration, etc. The effect of improved performance

Inactive Publication Date: 2019-04-02
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently developed negative electrode materials for sodium ion batteries are far from meeting the production requirements. The main problem is that the negative electrode materials have a large volume expansion during charging and discharging, which will cause cycle deterioration; in addition, poor conductivity is caused by sodium ions. Another problem that needs to be overcome is the negative electrode material of the battery. Poor electrical conductivity often leads to poor rate performance of the battery.
However, there are too many chemical reagents introduced in the preparation process of this method, and the evaporation of the solvent will also cause environmental pollution, the preparation efficiency is low, the yield is not high, and it cannot be produced on a large scale.
In addition, it is difficult and time-consuming to remove the silica template. The use of surfactants to prepare the carbon source is expensive. Due to the introduction of silica as a template, the resulting pore structure is relatively simple.

Method used

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  • A method for preparing a novel sodium-ion battery negative-electrode material
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  • A method for preparing a novel sodium-ion battery negative-electrode material

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Embodiment 1

[0034] Step 1, take 4mmol of zinc nitrate hexahydrate and dissolve it in 20mL of methanol solution, then quickly add it to 25mL of methanol solution containing 18mmol of 2-methylimidazole, let stand for 24h and then centrifuge to collect the white precipitate at the bottom to obtain the following: Zn 2+ Metal-organic framework (ZIF-8) as the coordination center;

[0035] Step 2. Dissolve 0.5g metal-organic framework (ZIF-8) in 50mL methanol solution, then add 1.0g triazole, stir evenly and let it stand for 3 days, then centrifuge to collect the chain exchange product (EZIF-8 );

[0036] Step 3: Weigh 100 mg of the chain exchange product (EZIF-8) and place it in a tube furnace, raise the temperature to 800°C at a rate of 5°C / min, calcinate at 800°C for 2 hours, and then cool;

[0037] Step 4. After cooling, put it into 1mol / L hydrochloric acid solution, soak for 6 hours, remove the zinc element, then dry it in a vacuum oven at 80°C for 6 hours, and collect the nitrogen-doped ...

Embodiment 2

[0044] Step 1. Weigh 5mmol of zinc acetate and dissolve it in 5mL of methanol solution, then quickly add it to 75mL of methanol solution containing 15mmol of 2-ethylimidazole, let stand for 36h and then centrifuge to collect the white precipitate at the bottom to obtain Zn 2+ Metal-organic framework (ZIF-8) as the coordination center;

[0045] Step 2. Dissolve 0.5g metal-organic framework (ZIF-8) in 250mL methanol solution, then add 1.5g triazole, stir well and let it stand for 4 days, then centrifuge to collect the chain exchange product (EZIF-8 );

[0046] Step 3: Weigh 100 mg of the chain exchange product (EZIF-8) and place it in a tube furnace, raise the temperature to 780°C at a rate of 15°C / min, calcinate at 780°C for 3 hours, and then cool;

[0047] Step 4. After cooling, put it into 4mol / L hydrochloric acid solution, soak for 10 hours, remove the zinc element, then dry it in a vacuum oven at 90°C for 8 hours, and collect the nitrogen-doped material used for the new ty...

Embodiment 3

[0050] Step 1. Weigh 2mmol of zinc acetate dihydrate and 2mmol of zinc nitrate and dissolve them in 40mL of methanol solution, then quickly add them to 240mL of methanol solution containing 24mmol of 2-nitroimidazole, let stand for 32h and centrifuge to collect the bottom White precipitate, obtained as Zn 2+ Metal-organic framework (ZIF-8) as the coordination center;

[0051] Step 2: Dissolve 0.5g metal-organic framework (ZIF-8) in 25mL methanol solution, then add 0.5g triazole, stir evenly and let stand for 3 days, then centrifuge to collect the chain exchange product (EZIF-8 );

[0052] Step 3: Weigh 100 mg of the chain exchange product (EZIF-8) and place it in a tube furnace, raise the temperature to 800°C at a rate of 10°C / min, calcinate at 800°C for 2 hours, and then cool;

[0053] Step 4. After cooling, put it into 2mol / L hydrochloric acid solution, soak for 8 hours, remove the zinc element, then dry it in a vacuum oven at 100°C for 10 hours, and collect the nitrogen-d...

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Abstract

A method for preparing a novel sodium-ion battery negative-electrode material is provided. The method includes a step of weighing a soluble zinc salt, dissolving the soluble zinc salt into a methanolsolution, rapidly adding the obtained solution into a methanol solution in which an organic ligand is dissolved, allowing the mixture to stand, then performing centrifugation, and collecting bottom white precipitate to obtain a metal organic framework; a step of dissolving the metal organic framework into a methanol solution, then adding triazole, allowing the mixture to stand after the mixture isfully stirred, performing centrifugation, and collecting a chain exchange product; a step of calcining the chain exchange product, soaking the product in a hydrochloric acid solution after the product is cooled, finally drying the product in a vacuum drying oven and collecting the product to obtain a nitrogen doped porous carbon material used as the novel sodium-ion battery negative-electrode material. ZIF-8 is synthesized from the soluble zinc salt and the imidazole organic ligand, then EZIF-8 is prepared through a solvent chain exchange manner, and finally high-temperature carbonization isperformed. The prepared porous carbon material contains micropores, mesopores and macropores, and has cyclic stability far better than that of porous carbon having a single pore diameter structure when the material is used as a battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a preparation method of a novel sodium electrode negative electrode material. Background technique [0002] Lithium-ion batteries have attracted extensive attention because of their high energy density, long service life, and environmental friendliness. However, with the large-scale application of electric vehicles and energy storage power stations, the demand for lithium resources has also increased significantly. The shortage and uneven distribution of lithium resources have also begun to emerge, which has become a bottleneck restricting the development of lithium-ion batteries. Therefore, developing a cheaper and better performance battery system is the main task at present. Compared with lithium batteries, sodium batteries have the following advantages: First, the sodium element is widely distributed, the price is low, and the extraction process is s...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01B32/05H01M4/587H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 李昭宇
Owner 桑顿新能源科技(长沙)有限公司
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