Method for preparing nitrogen-doped porous spherical disordered carbon material

Abstract

The invention provides a method for preparing a nitrogen-doped porous spherical disordered carbon material. The method comprises the steps of taking glycine and SiO<2> as a carbon-nitrogen source and a template agent; after performing spray granulation, carrying out high-temperature pyrolysis in argon atmosphere; and etching by using NaOH, and washing to obtain a target product. In the spray drying process, fine suspension liquid fog drops are rapidly dried by high-temperature airflow to form a spherical precursor which consists of glycine and SiO<2>; in the high-temperature pyrolysis process in the argon atmosphere, a part of carbon-nitrogen bonds are kept in the pyrolysis and carbonization of glycine, so that an effect of nitrogen doping is achieved; the prepared porous carbon spheres are mesoporous materials; the dimensions of the holes are about 10nm; the carbon spheres are uniform in particle diameter; the diameter of the carbon spheres is about 1-3[mu]m; the content of the doped nitrogen is about 10.86%; and the prepared nitrogen-doped porous spherical disordered carbon material, which is used as a negative electrode material of a lithium ion battery, has good electrochemical performance.

Description

technical field

[0001] The invention belongs to the field of synthesis of inorganic nanometer materials. More specifically, it relates to a method for preparing nitrogen-doped porous spherical disordered carbon by template method. Background technique

[0002] With the rapid development of society and economy, a series of resource and environmental problems such as the shortage of fossil energy and global warming have gradually begun to be exposed. Today, these deteriorating resource and environmental problems remind people that it is very necessary to pay attention to solving energy problems. Lithium-ion batteries have the advantages of high energy density, high power density and long life, and have been widely used in portable electronic devices, electric vehicles and hybrid vehicles. However, due to the limited and uneven distribution of lithium resources on the earth, the further large-scale application of lithium-ion batteries is limited, especially in large-scale ene...

Examples

Embodiment 1

[0041] 1). Dissolving 22.5g glycine into 1000mL deionized water to prepare a glycine solution with a concentration of 0.3mol / L;

[0042] 2). Put 4.5g SiO 2 Added to the glycine solution, magnetically stirred (10r / s), to obtain a milky white suspension;

[0043] 3). The milky white suspension prepared above is spray-dried at a drying temperature of 160°C;

[0044] 4). The above-mentioned spray-dried product was pyrolyzed under an argon atmosphere, the pyrolysis temperature was 700°C, the heating rate was 10°C / min, and the temperature was kept for 120min;

[0045] 5). Add the pyrolysis product to 100mL NaOH solution with a concentration of 1mol / L for boiling etching, and the etching time is 6h;

[0046] 6). The etching product was washed 5 times with deionized water, and dried at 100° C. for 24 hours to obtain the final product.

[0047] Use the obtained nitrogen-doped porous spherical disordered carbon material to make the negative electrode of the sodium ion battery, and as...

Embodiment 2

[0050] 1). Dissolving 30g of glycine into 1000mL of deionized water to prepare a glycine solution with a concentration of 0.4mol / L;

[0051] 2). Put 18g SiO 2 Add it into the glycine solution and stir (15r / s) to obtain a milky white suspension;

[0052] 3). The milky white suspension prepared above is spray-dried at a drying temperature of 180°C;

[0053] 4). The above-mentioned spray-dried product was pyrolyzed under an argon atmosphere, the pyrolysis temperature was 800°C, the heating rate was 6°C / min, and the temperature was kept for 90min;

[0054] 5). Add the pyrolysis product to 70 mL of NaOH solution with a concentration of 3 mol / L for boiling etching, and the etching time is 5 hours;

[0055] 6). The etching product was washed 7 times with deionized water, and dried at 100° C. for 36 hours to obtain the final product.

[0056] Use the obtained nitrogen-doped porous spherical disordered carbon material to make the negative electrode of the sodium ion battery, and ass...

Embodiment 3

[0059] 1). Dissolving 30g of glycine into 1000mL of deionized water to prepare a glycine solution with a concentration of 0.4mol / L;

[0060] 2). Add 30g SiO 2 Added to the glycine solution, magnetically stirred (15r / s) to obtain a milky white suspension;

[0061] 3). The milky white suspension prepared above is spray-dried at a drying temperature of 180°C;

[0062] 4). The above-mentioned spray-dried product was pyrolyzed under an argon atmosphere, the pyrolysis temperature was 800°C, the heating rate was 6°C / min, and the temperature was kept for 90min;

[0063] 5). Add the pyrolysis product to 70 mL of NaOH solution with a concentration of 3 mol / L for boiling etching, and the etching time is 5 hours;

[0064] 6). The etching product was washed 7 times with deionized water, and dried at 100° C. for 36 hours to obtain the final product.

[0065] Use the obtained nitrogen-doped porous spherical disordered carbon material to make the negative electrode of the sodium ion batter...

technical field

[0001] The invention belongs to the field of synthesis of inorganic nanometer materials. More specifically, it relates to a method for preparing nitrogen-doped porous spherical disordered carbon by template method. Background technique

[0002] With the rapid development of society and economy, a series of resource and environmental problems such as the shortage of fossil energy and global warming have gradually begun to be exposed. Today, these deteriorating resource and environmental problems remind people that it is very necessary to pay attention to solving energy problems. Lithium-ion batteries have the advantages of high energy density, high power density and long life, and have been widely used in portable electronic devices, electric vehicles and hybrid vehicles. However, due to the limited and uneven distribution of lithium resources on the earth, the further large-scale application of lithium-ion batteries is limited, especially in large-scale ene...

Examples

Embodiment 1

[0041] 1). Dissolving 22.5g glycine into 1000mL deionized water to prepare a glycine solution with a concentration of 0.3mol / L;

[0042] 2). Put 4.5g SiO 2 Added to the glycine solution, magnetically stirred (10r / s), to obtain a milky white suspension;

[0043] 3). The milky white suspension prepared above is spray-dried at a drying temperature of 160°C;

[0044] 4). The above-mentioned spray-dried product was pyrolyzed under an argon atmosphere, the pyrolysis temperature was 700°C, the heating rate was 10°C / min, and the temperature was kept for 120min;

[0045] 5). Add the pyrolysis product to 100mL NaOH solution with a concentration of 1mol / L for boiling etching, and the etching time is 6h;

[0046] 6). The etching product was washed 5 times with deionized water, and dried at 100° C. for 24 hours to obtain the final product.

[0047] Use the obtained nitrogen-doped porous spherical disordered carbon material to make the negative electrode of the sodium ion battery, and as...

Embodiment 2

[0050] 1). Dissolving 30g of glycine into 1000mL of deionized water to prepare a glycine solution with a concentration of 0.4mol / L;

[0051] 2). Put 18g SiO 2 Add it into the glycine solution and stir (15r / s) to obtain a milky white suspension;

[0052] 3). The milky white suspension prepared above is spray-dried at a drying temperature of 180°C;

[0053] 4). The above-mentioned spray-dried product was pyrolyzed under an argon atmosphere, the pyrolysis temperature was 800°C, the heating rate was 6°C / min, and the temperature was kept for 90min;

[0054] 5). Add the pyrolysis product to 70 mL of NaOH solution with a concentration of 3 mol / L for boiling etching, and the etching time is 5 hours;

[0055] 6). The etching product was washed 7 times with deionized water, and dried at 100° C. for 36 hours to obtain the final product.

[0056] Use the obtained nitrogen-doped porous spherical disordered carbon material to make the negative electrode of the sodium ion battery, and ass...

Embodiment 3

[0059] 1). Dissolving 30g of glycine into 1000mL of deionized water to prepare a glycine solution with a concentration of 0.4mol / L;

[0060] 2). Add 30g SiO 2 Added to the glycine solution, magnetically stirred (15r / s) to obtain a milky white suspension;

[0061] 3). The milky white suspension prepared above is spray-dried at a drying temperature of 180°C;

[0062] 4). The above-mentioned spray-dried product was pyrolyzed under an argon atmosphere, the pyrolysis temperature was 800°C, the heating rate was 6°C / min, and the temperature was kept for 90min;

[0063] 5). Add the pyrolysis product to 70 mL of NaOH solution with a concentration of 3 mol / L for boiling etching, and the etching time is 5 hours;

[0064] 6). The etching product was washed 7 times with deionized water, and dried at 100° C. for 36 hours to obtain the final product.

[0065] Use the obtained nitrogen-doped porous spherical disordered carbon material to make the negative electrode of the sodium ion batter...

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