Method for preparing three-dimensional porous graphene sheet by adopting low-temperature double-salt compound and application of three-dimensional porous graphene sheet

A three-dimensional porous, graphene sheet technology, applied in the field of electrochemistry and energy materials, can solve the problems of poor performance of double-layer capacitors, achieve high tap density, good conductivity, and improve the effect of surface loading capacity

Pending Publication Date: 2021-08-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, KOH is used as an activator, but the material prepared by this activator contains hydroxyl functional groups and the transmission of ions by the microporous network is limited, so that the performance of the double-layer capacitor is often poor when the electrode material is charged and discharged rapidly.

Method used

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  • Method for preparing three-dimensional porous graphene sheet by adopting low-temperature double-salt compound and application of three-dimensional porous graphene sheet
  • Method for preparing three-dimensional porous graphene sheet by adopting low-temperature double-salt compound and application of three-dimensional porous graphene sheet
  • Method for preparing three-dimensional porous graphene sheet by adopting low-temperature double-salt compound and application of three-dimensional porous graphene sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Weigh 200 g of dry coconut shell and place it in a pulverizer for 5 minutes to make it into a powder. The particle size is below 50 µm. Due to the small particle size below 50 µm, it can be evenly mixed and contacted with double salt , increasing the reactivity.

[0044] (2) Take 50 g of crushed coconut shells and place them under an argon atmosphere tube furnace for carbonization. The carbonization temperature is 650 °C, the carbonization time is 3 h, and the heating rate is 5 °C min -1 , naturally cooled to room temperature after carbonization; the heating rate was verified to be 5°C min by experiments -1 , the most suitable, too high a heating rate will affect the formation of carbon, and 650 degrees carbonization for 3 hours, mainly to fully decompose cellulose and hemicellulose.

[0045] (3) Combine the carbonized material with K 2 CO 3 and Na 2 CO 3 Mix evenly by mass 1:4, where K 2 CO 3 and Na 2 CO 3 The molar ratio is 0.45:0.55, carbon takes 10 g, K...

Embodiment 2

[0059] (1) Weigh 200 g of dry coconut shell and place it in a pulverizer for 5 min to make it into a powder with a particle size of 50 µm or less.

[0060] (2) Take 50 g of crushed coconut shells and place them under an argon atmosphere tube furnace for carbonization. The carbonization temperature is 650 °C, the carbonization time is 3 h, and the heating rate is 5 °C min -1 , and naturally cooled to room temperature after carbonization.

[0061] (3) Combine the carbonized material with K 2 CO 3 and Na 2 CO 3 Mix evenly by mass 1:4, where K 2 CO 3 and Na 2 CO 3 The molar ratio is 0.45:0.55, carbon takes 10 g, K 2 CO 3 and Na 2 CO 3 Take 20.6507 g and 19.3493 g, respectively.

[0062] (4) The mixed material was activated under a tube furnace in an argon atmosphere. The activation temperature was 1000°C, the activation time was 4h, and the heating rate was 5°C min -1 , and naturally cooled to room temperature after activation.

[0063] (5) Wash the activated materi...

Embodiment 3

[0066]Weigh 200 g of dry coconut shells and place them in a pulverizer for 5 min to make them into powder with a particle size of 50 μm or less.

[0067] (2) Take 50 g of crushed coconut shells and place them under an argon atmosphere tube furnace for carbonization. The carbonization temperature is 650 °C, and the carbonization time is 3 h. The heating rate is 5 °C min -1 , and naturally cooled to room temperature after carbonization.

[0068] (3) Combine the carbonized material with K 2 CO 3 and Na 2 CO 3 Mix evenly by mass 1:4, where K 2 CO 3 and Na 2 CO 3 The molar ratio is 0.45:0.55, the carbon is 10g, K 2 CO 3 and Na 2 CO 3 Take 20.6507 g and 19.3493 g, respectively.

[0069] (4) The mixed material was activated under a tube furnace in an argon atmosphere. The activation temperature was 900°C, the activation time was 4h, and the heating rate was 5°C min -1 , and naturally cooled to room temperature after activation.

[0070] (5) Wash the activated material ...

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Abstract

The invention discloses a method for preparing a three-dimensional porous graphene sheet by adopting a low-temperature double-salt compound and application, and aims to solve the problem of preparing the graphene sheet at low temperature. Compared with a traditional chemical or physical pore-forming method, the method has the advantages that the pore size distribution and the graphitization degree can be controlled at low temperature; and coconut shells are used as a biomass charcoal source, K2CO3 and Na2CO3 are used as activators, and the activation temperature is reduced by using a double-salt melting process. The activation process is intervened by gas (CO), K and Na released in the heating process, so that cross-linked sp3 carbon atoms in the hard carbon phase release graphite microcrystals, then the graphite microcrystals are recrystallized to form a graphene layer, and finally the unique three-dimensional porous graphene sheet is formed. According to the method, the energy consumption is reduced, large-scale production can be realized, and a scheme is provided for other biomass derived graphitized carbon.

Description

technical field [0001] The invention belongs to the field of electrochemistry and energy materials, and provides a method and application for preparing a three-dimensional porous graphene sheet by using a low-temperature double-salt compound. Background technique [0002] In recent years, the extensive use of fossil fuels has not only caused an energy crisis but also caused environmental pollution, and also brought expensive treatment costs. Therefore, developing clean energy and researching efficient energy storage systems is one of the effective ways to solve this problem. Undoubtedly, this plays a vital role in moving society towards renewable and sustainable energy and the efficient use of energy. In order to meet the energy demand of modern society and the requirements of protecting the ecological environment, it is urgent to find and develop low-cost, environmentally friendly and new energy storage and conversion systems. Currently, lithium-ion batteries have been su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01G11/34H01G11/24H01G11/86
CPCC01B32/184H01G11/34H01G11/24H01G11/86
Inventor 霍开富李高杰付继江高标
Owner WUHAN UNIV OF SCI & TECH
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