Sulfur-doping porous carbon material of sodium ion battery and preparation method of sulfur-doping porous carbon material

A sodium-ion battery, porous carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large interlayer spacing, mismatched interlayer spacing, poor cycle stability, etc., and achieve low cost and physical and chemical stability. good, repeatable results

Active Publication Date: 2016-07-27
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, although graphite has a high lithium storage capacity, its ability to store sodium is very weak, which is generally believed to be caused by the mismatch between the radius of sodium ions and the spacing between graphite layers.
Amorphous carbon has a low degree of graphitization, and its structure is mainly composed of a large number of disordered carbon crystallites interlaced. The graphite layer spacing is large and contains a large number of nanopores, which provide ideal active sites for the storage of sodium ions. Therefore, amorphous carbon materials (mesophase carbon microspheres, hard carbon, etc.) have high reversible sodium storage capacity, but such materials have poor cycle stability and fast capacity decay, which greatly limits their application in sodium-ion batteries.

Method used

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  • Sulfur-doping porous carbon material of sodium ion battery and preparation method of sulfur-doping porous carbon material
  • Sulfur-doping porous carbon material of sodium ion battery and preparation method of sulfur-doping porous carbon material
  • Sulfur-doping porous carbon material of sodium ion battery and preparation method of sulfur-doping porous carbon material

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Experimental program
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Effect test

Embodiment 1

[0042] First weigh 1.25g of zinc nitrate and dissolve it fully in 100mL of methanol solution, then weigh 2.32g of dimethylimidazole and slowly add it to the above solution under magnetic stirring conditions, and then continue stirring at room temperature for 16h. In the centrifugation method, the white precipitate obtained from the reaction is repeatedly washed with methanol and deionized water, and then dried to obtain the precursor of the zinc-based metal organic framework material.

[0043] Weigh 0.1g of Zn-based metal-organic framework material and 0.1g of sublimated sulfur powder in a corundum mortar and grind them thoroughly, transfer the powder after the two are evenly mixed into a corundum porcelain boat and put it into a single-temperature zone vacuum tube furnace. Introduce argon gas at 155°C to fully diffuse the sulfur powder in the internal channel structure of the metal-organic framework material. After the reaction was carried out for 3 hours, the tube furnace was...

Embodiment 2

[0051] First weigh 1.25g of zinc nitrate and dissolve it fully in 100mL of methanol solution, then weigh 2.32g of dimethylimidazole and slowly add it to the above solution under magnetic stirring conditions, and then continue stirring at room temperature for 16h. In the centrifugation method, the white precipitate obtained from the reaction is repeatedly washed with methanol and deionized water, and then dried to obtain the precursor of the zinc-based metal organic framework material.

[0052] Weigh 0.1g zinc-based metal-organic framework material and 0.05g sublimated sulfur powder and grind them fully in a corundum mortar, transfer the powder after the two are evenly mixed into a corundum porcelain boat and put it into a single-temperature zone vacuum tube furnace. Introduce argon gas at 155°C to fully diffuse the sulfur powder in the internal channel structure of the metal-organic framework material. After the reaction was carried out for 3 hours, the tube furnace was gradual...

Embodiment 3

[0055] First weigh 1.25g of zinc nitrate and dissolve it fully in 100mL of methanol solution, then weigh 1.45g of dimethylimidazole and slowly add it to the above solution under magnetic stirring conditions, and then continue stirring at room temperature for 16h. In the centrifugation method, the white precipitate obtained from the reaction is repeatedly washed with methanol and deionized water, and then dried to obtain the precursor of the zinc-based metal organic framework material.

[0056] Weigh 0.1g of Zn-based metal-organic framework material and 0.1g of sublimated sulfur powder in a corundum mortar and grind them thoroughly, transfer the powder after the two are evenly mixed into a corundum porcelain boat and put it into a single-temperature zone vacuum tube furnace. Introduce argon gas at 155°C to fully diffuse the sulfur powder in the internal channel structure of the metal-organic framework material. After the reaction was carried out for 3 hours, the tube furnace was...

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Abstract

The invention discloses a sulfur-doping porous carbon material of a sodium ion battery and a preparation method of the sulfur-doping porous carbon material. The sulfur-doping porous carbon material is formed by chemical doping of sulfur in a carbon material, and the carbon material has a loosen and porous spongy structure. The preparation method comprises the following step of preparing a metal organic frame material from a metal inorganic salt and an organic ligand by an in-situ growth method; and grinding and mixing the metal organic frame material and sulfur powder, placing the obtained mixture in an inert gas, carrying out low-temperature thermal treatment and then carrying out high-temperature carbonization on the obtained mixture, and washing and drying the carbonized product to obtain the sulfur-doping porous carbon material. The sulfur-doping porous carbon material prepared according to the method has excellent long-circulation stability, favorable rate performance and high specific capacity when taken as a negative electrode of the sodium ion battery; and moreover, the preparation method is simple, is low in cost and has wide industrial application prospect.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium ion battery and a preparation method thereof, in particular to a sulfur-doped porous carbon material for a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] With the gradual reduction of traditional energy sources such as coal, oil, and natural gas, and increasingly severe environmental problems, the demand for small separated mobile power supplies has shown an explosive growth trend, and various rechargeable electrochemical power supplies have received more and more attention. Especially since the advent of new chemical power lithium-ion batteries in the 1980s, as the third generation of rechargeable batteries, they have attracted much attention due to their excellent performance such as large specific energy, good cycle performance, high working voltage, long life and low pollution. Used in hybrid electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/054
CPCH01M4/362H01M4/587H01M4/62H01M10/054H01M2004/021Y02E60/10
Inventor 张治安史晓东宋俊肖赖延清李劼张凯
Owner CENT SOUTH UNIV
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