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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  • 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 batte

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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

Examples

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Example Embodiment

[0033] Example 1

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

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

[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 heating rate of 5 °C / min, calcine at 800 °C for 2 hours, and then cool;

[0037] Step 4. After cooling, put it into a 1mol / L hydrochloric acid solution, soak it for 6 hours, remove the zinc element, and then dr...

Example Embodiment

[0043] Example 2

[0044] Step 1. Weigh 5 mmol of zinc acetate and dissolve it in 5 mL of methanol solution, then quickly add it into 75 mL of methanol solution dissolved with 15 mmol of 2-ethylimidazole, stand for 36 h and collect the white precipitate at the bottom by centrifugation. 2+ is a metal-organic framework (ZIF-8) with a coordination center;

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

[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 heating rate of 15 °C / min, calcine at 780 °C for 3 hours, and then cool;

[0047] Step 4: After cooling, put it into a 4mol / L hydrochloric acid solution, soak it for 10 hours, remove the zinc element, and then dry it in a vacuum drying box at 90 ° C for 8 hours, and c...

Example Embodiment

[0049] Example 3

[0050] Step 1. Weigh 2 mmol of zinc acetate dihydrate and 2 mmol of zinc nitrate and dissolve them in 40 mL of methanol solution, then quickly add them into 240 mL of methanol solution dissolved with 24 mmol of 2-nitroimidazole. white precipitate, obtained as Zn 2+ is a metal-organic framework (ZIF-8) with a 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, and then collect the chain exchange product (EZIF-8) by centrifugation. );

[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 heating rate of 10°C / min, calcine at 800°C for 2 hours, and then cool;

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

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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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