Preparation method of nitrogen-doped carbon aerogel applied to lithium-ion battery

A lithium-ion battery, carbon aerogel technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of wide explosion limit of ammonia gas, dangerous operation process, etc., and achieve a simple and effective preparation method, excellent conductivity, high The effect of energy density and power density

Inactive Publication Date: 2016-12-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires high temperature in the process of using ammonia gas, and the explosion limit of ammonia gas is relatively wide, and the operation process is more dangerous

Method used

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  • Preparation method of nitrogen-doped carbon aerogel applied to lithium-ion battery
  • Preparation method of nitrogen-doped carbon aerogel applied to lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh resorcinol and melamine in a certain proportion, add 1.2g / L NaOH solution and stir, then add 37wt% formaldehyde solution, stir at 60°C until clear. Wherein, the molar ratio of resorcinol to melamine is 9:1; the molar ratio of NaOH to (resorcinol+melamine) is 1:100, and formaldehyde: (resorcinol+melamine)=2:1.

[0029] (2) The clear solution obtained in (1) was transferred to a sealed container, gelled at 50° C. for 1 day, and aged at 80° C. for 5 days to obtain a wet gel.

[0030] (3) The wet gel obtained in (2) was soaked in acetone solution for solvent replacement, and the acetone was renewed every 8 hours for a total of 6 times.

[0031] (4) drying the wet gel obtained in (3) at 50° C. to obtain an aerogel.

[0032] (5) Put the aerogel obtained in (4) into a tube furnace, and carbonize at 700° C. for 3 h to obtain nitrogen-doped carbon aerogel. The nitrogen content of the material is 2.82 at%.

Embodiment 2

[0034] (1) Weigh resorcinol and melamine in a certain proportion, add 1.2g / L NaOH solution and stir, then add 37wt% formaldehyde solution, stir at 60°C until clear. Among them, the molar ratio of resorcinol to melamine is 7:3; the molar ratio of NaOH to (resorcinol+melamine) is 1:100, and formaldehyde: (resorcinol+melamine)=2:1.

[0035] (2) Transfer the clear solution obtained in (1) to a sealed container, gel at 50°C for 1 day, and age at 80°C for 5 days to obtain a wet gel.

[0036] (3) The wet gel obtained in (2) was soaked in acetone solution for solvent replacement, and the acetone was renewed every 8 hours for a total of 6 times.

[0037] (4) drying the wet gel obtained in (3) at 50° C. to obtain an aerogel.

[0038] (5) Put the aerogel obtained in (4) into a tube furnace, and carbonize at 700° C. for 3 h to obtain nitrogen-doped carbon aerogel. The nitrogen content of the material is 3.82 at%.

Embodiment 3

[0040] (1) Weigh resorcinol and melamine in a certain proportion, add 1.2g / L NaOH solution and stir, then add 37wt% formaldehyde solution, stir at 60°C until clear. Wherein, the molar ratio of resorcinol to melamine is 5:5; the molar ratio of NaOH to (resorcinol+melamine) is 1:100, and formaldehyde: (resorcinol+melamine)=2:1.

[0041] (2) The clear solution obtained in (1) was transferred to a sealed container, gelled at 50° C. for 1 day, and aged at 80° C. for 5 days to obtain a wet gel.

[0042] (3) The wet gel obtained in (2) was soaked in acetone solution for solvent replacement, and the acetone was renewed every 8 hours for a total of 6 times.

[0043] (4) drying the wet gel obtained in (3) at 50° C. to obtain an aerogel.

[0044] (5) Put the airgel obtained in (4) into a tube furnace, and carbonize it at 700°C for 3 hours to obtain nitrogen-doped carbon airgel. The SEM picture is as follows figure 2 shown. Such as figure 1 As shown, the nitrogen content of the nitro...

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Abstract

The invention discloses a preparation method of nitrogen-doped carbon aerogel applied to a lithium-ion battery. The method comprises the steps of firstly, adding taken resorcinol and melamine to an NaOH water solution with the concentration of 1.2g/L, stirring and transferring the mixed solution to a sealed container for gelatinization and ageing to obtain wet gel, soaking the wet gel into acetone for solvent replacement and then drying to obtain aerogel; and putting the aerogel into a tube furnace for carbonization to obtain the nitrogen-doped carbon aerogel. The nitrogen-doped carbon aerogel by employing the melamine as a nitrogen source and resorcinol-melamine-formaldehyde as a carbon source is formed by doping nitrogen into a carbon material, has hierarchical pore distribution and has high energy density and power density when used for a negative electrode of the lithium-ion battery.

Description

technical field [0001] The invention belongs to the field of energy storage batteries, and in particular relates to a preparation method of nitrogen-doped carbon airgel applied to lithium-ion batteries. Background technique [0002] Airgel can be regarded as a solid material with a three-dimensional network structure formed by gel particles dispersed in a gas medium. Carbon aerogels with large porosity and very light weight can be obtained by carbonizing organic aerogels under certain conditions. Carbon aerogels have great porosity, large specific surface area, low density, and good electrical conductivity, and can be directly applied to electrodes in a monolithic form, avoiding the use of binders. Therefore, it is a a promising electrode material. [0003] Carbon aerogels are generally obtained by using phenolic compounds and formaldehyde as raw materials to form phenolic gels, which are then carbonized after a certain drying method. The diameters of nitrogen and carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/1397
CPCH01M4/1397H01M4/583Y02E60/10
Inventor 卢骋吴勇军陈湘明
Owner ZHEJIANG UNIV
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