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Preparation method of carbon aerogel, carbon aerogel and lithium ion capacitor prepared from same

A carbon aerogel and gel technology, which is applied in capacitors, electrolytic capacitors, double-layer capacitors, etc., can solve the problems of low conductivity of carbon aerogels, poor material rate performance, complicated operation, etc. The effect of high pore capacity and high economic value

Active Publication Date: 2018-02-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is costly and cumbersome to operate, and the obtained carbon airgel has low conductivity, less mesopore content in the structure, and poor rate performance of the material.

Method used

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  • Preparation method of carbon aerogel, carbon aerogel and lithium ion capacitor prepared from same
  • Preparation method of carbon aerogel, carbon aerogel and lithium ion capacitor prepared from same
  • Preparation method of carbon aerogel, carbon aerogel and lithium ion capacitor prepared from same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of carbon airgel, comprising the following steps:

[0031] (1) Dissolve lignin powder in potassium hydroxide solution, then ultrasonically disperse for 1 h, then add polyvinylpyrrolidone to the potassium hydroxide solution to form a gel, wherein the mass ratio of lignin to potassium hydroxide is 0.5, polyvinylpyrrolidone The quality of vinylpyrrolidone is 5% of lignin quality;

[0032] (2) Add potassium ferrate to the gel obtained in step (1), and ultrasonically disperse it for 0.5h, and after standing for 5h, obtain a carbon airgel precursor through freeze-drying, wherein the quality of potassium ferrate is wood 5% of prime quality;

[0033] (3) Heat the carbon airgel precursor obtained in step (2) to 250°C and keep it warm for 1h, then continue to heat up to 700°C and keep it warm for 2h, then acid wash, suction filter, and dry to get the carbon aerogel .

[0034] The specific surface area of ​​the carbon airgel prepared in this example is 600m...

Embodiment 2

[0036] A preparation method of carbon airgel, comprising the following steps:

[0037] (1) Dissolve lignin powder in potassium hydroxide solution, then ultrasonically disperse for 1 h, then add polyacrylamide to the potassium hydroxide solution to form a gel, wherein the mass ratio of lignin to potassium hydroxide is 2, polyacrylamide The quality of acrylamide is 10% of the quality of lignin;

[0038] (2) Add potassium trioxalate ferrate to the gel obtained in step (1), and ultrasonically disperse it for 0.5h, and after standing for 5h, obtain a carbon airgel precursor through freeze-drying treatment, wherein ferric trioxalate The quality of potassium acid is 15% of lignin quality;

[0039] (3) Heat the carbon airgel precursor obtained in step (2) to 300°C and keep it warm for 1h, then continue to heat up to 800°C and keep it warm for 2h, then acid wash, suction filter, and dry to get the carbon aerogel .

[0040] The specific surface area of ​​the carbon airgel prepared in...

Embodiment 3

[0042] A preparation method of carbon airgel, comprising the following steps:

[0043] (1) Dissolve lignin powder in potassium hydroxide solution, then ultrasonically disperse for 1 h, then add chitosan to the potassium hydroxide solution to form a gel, wherein the mass ratio of lignin to potassium hydroxide is 3, and the shell The mass of polysaccharides is 15% of the mass of lignin;

[0044] (2) Add potassium ferrate to the gel obtained in step (1), and ultrasonically disperse it for 0.5h, and after standing for 5h, obtain a carbon airgel precursor through freeze-drying, wherein the quality of potassium ferrate is wood 30% of prime mass;

[0045] (3) The carbon airgel precursor obtained in step (2) was first heated to 400°C and kept for 1h, then continued to be heated to 850°C and kept for 2h, then acid washed, suction filtered, and dried to obtain carbon aerogel .

[0046] The specific surface area of ​​the carbon airgel prepared in this example is 2513m 2 g -1 , the s...

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Abstract

A preparation method of carbon aerogel comprises the following steps: (1) dissolving lignin powder in alkali lye, ultrasonically dispersing the lignin powder, and adding water-soluble polymer to the alkali lye to form gel; (2) adding ferrite to the gel obtained in step (1), ultrasonically dispersing the ferrite, and obtaining a carbon aerogel precursor by freeze drying; and (3) carrying out high-temperature carbonizing, pickling, suction filtering and drying on the carbon aerogel precursor obtained in step (2) to obtain carbon aerogel. The carbon aerogel prepared in the invention has large specific surface area, high mesoporous capacity and high conductivity.

Description

technical field [0001] The invention belongs to the field of carbon materials, and in particular relates to a preparation method of carbon aerogels, carbon aerogels and applications thereof. Background technique [0002] Lithium-ion capacitor is a new type of power storage device, and electrode material is an important part of it. The capacitive material in lithium-ion capacitor requires high specific surface area, reasonable pore size distribution and pore structure. Carbon airgel is a new type of lightweight nanoporous carbon material, which has the characteristics of high porosity, high specific surface area, and good electronic conductivity. It is one of the ideal electrode materials for supercapacitors or lithium ion capacitors. [0003] Traditional carbon aerogels generally use phenols and formaldehyde as raw materials, and sodium carbonate as a catalyst. The carbon aerogel precursor is prepared by sol-gel or template method, and then the precursor is treated with an a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/32H01G11/44H01G11/24H01G11/50H01G11/06
CPCY02E60/13H01G11/86H01G11/06H01G11/24H01G11/32H01G11/44H01G11/50
Inventor 郭华军杨哲伟王志兴李新海王接喜彭文杰胡启阳崔立志
Owner CENT SOUTH UNIV
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