Aza-graphene and manganese dioxide hybrid aerogel, preparation method and application thereof

A technology of graphene oxide and graphene hydrogel, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of destroying the close contact between electrode materials and current collectors, the attenuation of electrochemical performance, and the detachment of electrode materials. Good cycle stability, improved electrical conductivity, and low cost

Active Publication Date: 2016-07-20
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] First of all, during the charging and discharging process of lithium-ion batteries, the electrode material based on manganese dioxide will undergo a significant volume change, which will destroy the close contact between the electrode material and the current collector, and cause the electrode material to be separated from the current collector, eventually leading to a Chemical property decay
In addition, MnO-based electrode materials usually have low electrical conductivity, so these electrode materials have poor rate performance during charge and discharge.

Method used

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  • Aza-graphene and manganese dioxide hybrid aerogel, preparation method and application thereof
  • Aza-graphene and manganese dioxide hybrid aerogel, preparation method and application thereof
  • Aza-graphene and manganese dioxide hybrid aerogel, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0063] Ammonia (4mL, 28wt%) was added to the graphene oxide aqueous dispersion (18mL, 5mgmL –1 ), and then the mixture was placed in a stainless steel reactor, and it was hydrothermally reacted at 180°C for 12h.

[0064] After the reaction was completed and the temperature of the reaction system dropped to room temperature, the above mixture formed a black azagraphene hydrogel. The above-mentioned hydrogel is replaced with a large amount of water to obtain pure aza-graphene hydrogel.

[0065] At room temperature, the azagraphene hydrogel was soaked in a mixed solution of 0.1M potassium permanganate and 0.1M sodium sulfate. After 30 minutes, the above-mentioned azagraphene and manganese dioxide hybrid hydrogel was replaced with a large amount of water to obtain pure azagraphene and manganese dioxide hybrid hydrogel.

[0066] After freeze-drying the azagraphene and manganese dioxide hybrid hydrogel, the azagraphene and manganese dioxide hybrid aerogel can be obtained.

Embodiment 2

[0068] Ammonia (4mL, 28wt%) was added to the graphene oxide aqueous dispersion (18mL, 5mgmL –1 ), and then the mixture was placed in a stainless steel reactor, and it was hydrothermally reacted at 180°C for 12h.

[0069] After the reaction was completed and the temperature of the reaction system dropped to room temperature, the above mixture formed a black azagraphene hydrogel. The above-mentioned hydrogel is replaced with a large amount of water to obtain pure aza-graphene hydrogel.

[0070] At room temperature, the azagraphene hydrogel was soaked in a mixed solution of 0.1M potassium permanganate and 0.1M sodium sulfate. After 60 min, the above-mentioned azagraphene and manganese dioxide hybrid hydrogel was replaced with a large amount of water to obtain pure azagraphene and manganese dioxide hybrid hydrogel.

[0071] After freeze-drying the azagraphene and manganese dioxide hybrid hydrogel, the azagraphene and manganese dioxide hybrid aerogel can be obtained.

Embodiment 3

[0073] Ammonia (4mL, 28wt%) was added to the graphene oxide aqueous dispersion (18mL, 5mgmL –1 ), and then the mixture was placed in a stainless steel reactor, and it was hydrothermally reacted at 180°C for 12h.

[0074] After the reaction was completed and the temperature of the reaction system dropped to room temperature, the above mixture formed a black azagraphene hydrogel. The above-mentioned hydrogel is replaced with a large amount of water to obtain pure aza-graphene hydrogel.

[0075] At room temperature, the azagraphene hydrogel was soaked in a mixed solution of 0.1M potassium permanganate and 0.1M sodium sulfate. After 120 minutes, the above-mentioned azagraphene and manganese dioxide hybrid hydrogel was replaced with a large amount of water to obtain pure azagraphene and manganese dioxide hybrid hydrogel.

[0076] After freeze-drying the azagraphene and manganese dioxide hybrid hydrogel, the azagraphene and manganese dioxide hybrid aerogel can be obtained.

[007...

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Abstract

The present invention relates to an aza-graphene and manganese dioxide hybrid aerogel, a preparation method and an application thereof. The aerogel uses a three-dimensional network structure formed by two-dimensional aza-graphene sheets as a substrate, and manganese dioxide particles are loaded on the aza-graphene sheets. According to the preparation method, an aza-graphene hydrogel is soaked in a mixed solution of potassium permanganate and sodium sulfate, and the potassium permanganate and carbon in the aza-graphene act so as to obtain the aza-graphene and manganese dioxide hybrid aerogel. After action, the manganese dioxide is uniformly loaded onto the aza-graphene sheets. The preparation method is simple and convenient, and is applicable to large-scale production. The hybrid aerogel prepared by the preparation method has high specific surface area, a porous three-dimensional network structure, high specific capacity, and good circulation stability, thereby being applied to fields such as lithium ion batteries.

Description

technical field [0001] The invention relates to an airgel material and its preparation method and application, in particular to an azagraphene and manganese dioxide hybrid airgel material and its preparation method and application. Background technique [0002] In recent years, graphene materials have attracted extensive attention. It is a nanomaterial with the thickness of a single layer of carbon atoms exfoliated from graphite. Graphene is the thinnest material known in the world, its thickness is only the diameter of a carbon atom (0.142nm). Although it is the thinnest material in the world, scientists have learned through tests using atomic-scale metal and diamond probes that graphene is 100 times stronger than the world's best steel. Graphene has many excellent physical and chemical properties, such as large specific surface area, good electrical conductivity, excellent chemical stability, and excellent thermal stability. Based on the above characteristics, graphene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/50
CPCY02E60/10
Inventor 韩宝航隋竹银杨全胜
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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