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Preparation method of porous carbon aerogel with super-high specific surface area

A technology of ultra-high specific surface area and carbon airgel, which is applied in the direction of electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., to achieve good cycle stability, simple preparation process, and high specific capacity.

Active Publication Date: 2016-11-30
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional methods for preparing such materials have certain limitations, such as the specific surface area of ​​carbon materials is limited to 3000m 2 g -1 The following and need to add additional templates to prepare mesopores, etc.

Method used

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  • Preparation method of porous carbon aerogel with super-high specific surface area
  • Preparation method of porous carbon aerogel with super-high specific surface area
  • Preparation method of porous carbon aerogel with super-high specific surface area

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1) Drop the iota-type carrageenan aqueous solution with a mass fraction of 2% into the ethanol solution of ferric chloride with a concentration of 1M, wash with deionized water, and prepare a carrageenan-iron hydrogel.

[0024] 2) preparing the carrageenan-iron hydrogel into an aerogel by freeze-drying;

[0025] 3) Carrageenan-iron aerogel is calcined at 400°C for 1 hour in a tube furnace under an argon atmosphere to obtain a carbon aerogel-iron sulfide nanocomposite;

[0026] 4) remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite material with an aqueous hydrochloric acid solution with a concentration of 2M to obtain the carbon aerogel;

[0027] 5) The carbon aerogel is activated with potassium hydroxide, and the mass ratio of potassium hydroxide to the carbon aerogel is 4:1. The activation process is calcination at 800° C. for 1 hour in a nitrogen atmosphere. Obtain super high specific surface porous carbon deposition airgel;

[0028] 6) The el...

Embodiment 2

[0030] 1) Drop the iota-type carrageenan aqueous solution with a mass fraction of 2% into the ethanol solution of ferric chloride with a concentration of 1M, wash with deionized water, and prepare a carrageenan-iron hydrogel.

[0031] 2) preparing the carrageenan-iron hydrogel into an aerogel by freeze-drying;

[0032] 3) Carrageenan-iron aerogel was calcined at 300°C for 1 hour in a tube furnace under an argon atmosphere to obtain a carbon aerogel-iron sulfide nanocomposite;

[0033] 4) remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite material with an aqueous hydrochloric acid solution with a concentration of 2M to obtain the carbon aerogel;

[0034] 5) The carbon aerogel is activated with potassium hydroxide, and the mass ratio of potassium hydroxide to the carbon aerogel is 4:1. The activation process is calcination at 800° C. for 1 hour in a nitrogen atmosphere. Obtain super high specific surface porous carbon deposition airgel;

[0035] 6) The e...

Embodiment 3

[0037] 1) Drop the iota-type carrageenan aqueous solution with a mass fraction of 2% into the ethanol solution of ferric chloride with a concentration of 1M, wash with deionized water, and prepare a carrageenan-iron hydrogel.

[0038] 2) preparing the carrageenan-iron hydrogel into an aerogel by freeze-drying;

[0039] 3) Carrageenan-iron aerogel is calcined at 500°C for 1 hour in a tube furnace under an argon atmosphere to obtain a carbon aerogel-iron sulfide nanocomposite;

[0040] 4) remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite material with an aqueous hydrochloric acid solution with a concentration of 2M to obtain the carbon aerogel;

[0041] 5) The carbon aerogel is activated with potassium hydroxide, and the mass ratio of potassium hydroxide to the carbon aerogel is 4:1. The activation process is calcination at 800° C. for 1 hour in a nitrogen atmosphere. Obtain super high specific surface porous carbon deposition airgel;

[0042] 6) The el...

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Abstract

The invention discloses a preparation method of a porous carbon aerogel with super-high specific surface area, and belongs to the field of lithium ion batteries. The carbon aerogel adopts well-sourced carrageenan, ferric chloride and potassium hydroxide as raw materials to successfully prepare the lithium ion battery and the carbon aerogel with super-high specific surface area for a super capacitor. The carbon aerogel has super-high specific surface area which achieves 4037sq.m. / g, the material has excellent reversible specific capacity (890mAh / g, the current density is 1672mA / g) and good cycling stability (the specific capacity of the material after continuously charging / discharging for 200 times maintains at 90% of the initial specific capacity) while being used as the anode material of a lithium sulfur battery, and is a very promising electrode material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a porous carbon airgel with an ultrahigh specific surface area. Background technique [0002] Lithium-sulfur batteries can provide high energy density (2600Wh / kg), and the earth's sulfur content is abundant and non-toxic, making lithium-sulfur batteries very popular and becoming a very attractive energy storage device. The research on electrode materials for lithium-sulfur batteries has also become a hot spot in recent years. Several parts such as positive electrode (sulfur), negative electrode (metal lithium), electrolyte, separator, current collector and so on constitute the lithium-sulfur battery. However, some shortcomings of lithium-sulfur batteries lead to the attenuation of its performance and limit its application, such as the insulation of sulfur, the volume expansion of sulfur during charge and discharge, and the solubility of in...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/36H01M4/1393H01M10/052
CPCH01M4/1393H01M4/362H01M4/583H01M10/052Y02E60/10
Inventor 杨东江李建江朱小奕赵小亮孙瑾
Owner QINGDAO UNIV
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