Composite asphalt-based active carbon preparation method and supercapacitor

A pitch-based, composite technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of low mesoporous content, low specific capacity, and high internal resistance, and achieve the effect of reducing internal resistance and increasing mesoporosity.

Inactive Publication Date: 2016-11-16
SHANDONG OBO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the current commercial supercapacitor carbon is still dominated by micropores, and the content of mesopores is low; the internal resistance is high, and the preparation of supercapacitor

Method used

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  • Composite asphalt-based active carbon preparation method and supercapacitor
  • Composite asphalt-based active carbon preparation method and supercapacitor
  • Composite asphalt-based active carbon preparation method and supercapacitor

Examples

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Example Embodiment

[0039] The invention provides a method for preparing composite pitch-based activated carbon, which includes the following steps:

[0040] A) After mixing the molten matrix pitch with graphene oxide, a mixture is obtained;

[0041] B) Under the conditions of inert gas and / or nitrogen, the mixture obtained in the above steps is coked and reduced to obtain mixed green coke;

[0042] C) After crushing the mixed green coke obtained in the above steps and mixing it with alkali again, it is pre-activated and activated under inert gas and / or nitrogen conditions to obtain a semi-finished product;

[0043] D) After washing and drying the semi-finished product obtained in the above steps, it is subjected to heat treatment under protective gas conditions to obtain composite pitch-based activated carbon.

[0044] The present invention first mixes the molten matrix pitch and graphene oxide to obtain a mixture.

[0045] The present invention does not have any special restrictions on the base pitch. The...

Example Embodiment

[0065] Example 1

[0066] Take 500g coal tar pitch, heat it to melt, keep the temperature at 150℃; weigh 5g graphene oxide powder into the coal tar pitch, stir for 20min, then use a shearing machine to stir for 90min, shear speed 150rmp; cool to 120℃ and place 60min, then shear again for 90min to obtain coal tar pitch with fully dispersed graphene oxide;

[0067] Under the protection of nitrogen, the pitch is heated to 450°C for 8h in a coking furnace, cooled naturally, and then pulverized into a powder of 50-100μm in a pulverizer; 1500g of powdered KOH is added and mixed uniformly. Put this mixture into a metallic nickel crucible, heat it up to 450°C at a rate of 10-20°C / min and keep it for 3h under a nitrogen atmosphere; then heat it up to 750°C at a rate of 10-20°C / min to activate for 2h, and then naturally drop to room temperature . The product was dissolved in water, washed repeatedly to neutrality, and then 6M hydrochloric acid was added to reflux for 2h, filtered, washed w...

Example Embodiment

[0072] Example 2

[0073] Take 200g of coal tar pitch, heat it to melt, keep the temperature at 180℃; weigh 1g of graphene oxide powder into coal tar pitch, stir for 20min, then use a shearing machine to stir for 90min at a shear speed of 150rmp; cool to 120℃ and place 60min, then shear again for 90min to obtain coal tar pitch with fully dispersed graphene oxide;

[0074] Under the protection of nitrogen, the pitch is heated to 500°C for 6h in a coking furnace, cooled naturally, and then pulverized into a powder of 50-100μm in a pulverizer; 500g powdered KOH is added and mixed uniformly. Put this mixture into a metal nickel crucible, heat it up to 450°C at a rate of 10-20°C / min and keep it for 3h under a nitrogen atmosphere; then heat it up to 750°C at a rate of 10-20°C / min to activate for 1.5h, and naturally decrease Room temperature. The product was dissolved in water, washed repeatedly to neutrality, and then 6M hydrochloric acid was added to reflux for 2h, filtered, washed wi...

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Abstract

The invention provides a method for preparing a composite pitch-based activated carbon. In the invention, graphene oxide and pitch coke are reduced and activated through high-temperature coking, and graphene oxide forms a uniform network inside the pitch coke; at the same time, after high-temperature activation and high-temperature Reduction, graphene oxide removes most of the oxygen to form graphene, so that a good conductive network is formed inside the activated carbon and the internal resistance of the activated carbon is reduced. The preparation method provided by the present invention effectively solves the problem that the existing activated carbon is mainly composed of micropores, the pore size distribution is unreasonable, the proportion of alkali used in the preparation process is relatively high, and the performance of activated carbon still cannot meet the requirements for capacity and internal resistance. Big question. The composite pitch-based activated carbon prepared by the invention has the advantages of reasonable pore size distribution, large specific surface area, low internal resistance, high capacity, low impurities and low oxygen-containing functional groups, and can be used as supercapacitor carbon to obtain supercapacitors with better performance.

Description

technical field [0001] The invention belongs to the technical field of activated carbon materials, and in particular relates to a preparation method of composite pitch-based activated carbon and a supercapacitor. Background technique [0002] Activated carbon, also known as activated carbon black, is black powder or block, granular, honeycomb amorphous carbon, and there are also regular crystalline carbons. In addition to carbon elements, activated carbon also contains a small amount of hydrogen and oxygen elements. Part of these elements are derived from the incomplete carbonization of the activated carbon precursor and remain in the activated carbon, and the other part is formed by the reaction of activating reagents such as water or sodium hydroxide with the surface of activated carbon. Hydroxyl, carboxyl, carbonyl and other groups. In addition, there is also a part of ash in activated carbon, which is mainly composed of inorganic salts remaining in activated carbon, suc...

Claims

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Application Information

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IPC IPC(8): C01B31/12H01G11/32
CPCY02E60/13H01G11/32C01P2002/72C01P2004/03C01P2004/61C01P2006/12C01P2006/16C01P2006/17C01P2006/40C01P2006/80
Inventor 刘海波张在忠董士光
Owner SHANDONG OBO NEW MATERIAL CO LTD
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