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

3 Cites 10 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, conventional methods for preparing such materials have certain limitations, such as the specific surface area of ...

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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.

Application Domain

Cell electrodesLi-accumulators

Technology Topic

Lithium electrodePower flow +13

Image

Examples

Experimental program(3)

Example Embodiment

[0022] Example 1

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

[0024] 2) Preparation of carrageenan-iron hydrogel into 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 with a 2M hydrochloric acid aqueous solution to obtain a 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 a super high specific surface porous carbon deposition aerogel;

[0028] 6) Use an electrochemical workstation and a blue battery test system to test the electrochemical performance of the above product as a positive electrode material for a lithium-sulfur battery.

Example Embodiment

[0029] Example 2

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

[0031] 2) Preparation of carrageenan-iron hydrogel into aerogel by freeze drying;

[0032] 3) Carrageenan-iron aerogel is 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 with a 2M hydrochloric acid aqueous solution to obtain a 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 a super high specific surface porous carbon deposition aerogel;

[0035] 6) Use an electrochemical workstation and a blue battery test system to test the electrochemical performance of the above product as a positive electrode material for a lithium-sulfur battery.

Example Embodiment

[0036] Example 3

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

[0038] 2) Preparation of carrageenan-iron hydrogel into aerogel by freeze drying;

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

[0040] 4) Remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite with a 2M hydrochloric acid aqueous solution to obtain a 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 a super high specific surface porous carbon deposition aerogel;

[0042] 6) Use an electrochemical workstation and a blue battery test system to test the electrochemical performance of the above product as a positive electrode material for a lithium-sulfur battery.

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