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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
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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 supercapacitors needs to add 5-10% conductive carbon black to form a conductive network; in addition, the specific capacity is still relatively low. Low, the energy density is still far from that of lithium batteries

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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

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preparation example Construction

[0039] The invention provides a kind of preparation method of composite pitch-based activated carbon, comprising the following steps:

[0040] A) after the matrix pitch after melting is mixed with graphene oxide, a mixture is obtained;

[0041] B) Under the condition of inert gas and / or nitrogen, after coking and reducing the mixture obtained in the above steps, mixed green coke is obtained;

[0042] C) pulverizing the mixed raw coke obtained in the above steps, mixing it with alkali again, and performing preactivation and activation under the conditions of inert gas and / or nitrogen to obtain a semi-finished product;

[0043] D) After washing and drying the semi-finished product obtained in the above steps, under the condition of protective gas, after heat treatment, the composite pitch-based activated carbon is obtained.

[0044] In the present invention, firstly, the melted base pitch and graphene oxide are mixed to obtain the mixture.

[0045] The present invention has no...

Embodiment 1

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

[0067] Under the protection of nitrogen, heat the pitch to 450°C in a coking furnace for 8 hours, cool it naturally, and then crush it into a powder of 50-100 μm in a pulverizer; add 1500g of powdered KOH and mix evenly. Put this mixture into a metal nickel crucible, raise the temperature to 450°C at a rate of 10-20°C / min under nitrogen atmosphere and keep it for 3h; . The product was dissolved in water, washed repeatedly until neutral, then added with 6M hydrochloric acid to reflux for 2 hours, filtered, washed with deionized water until neutral, and dried in vacuum. Put the obtained solid powder into a rotary furn...

Embodiment 2

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

[0074] Under the protection of nitrogen, heat the asphalt in the coking furnace to 500°C for 6 hours, cool naturally, and then pulverize it into a powder of 50-100 μm in a pulverizer; add 500g of powdered KOH and mix evenly. Put this mixture into a metal nickel crucible, raise the temperature to 450°C at a rate of 10-20°C / min under nitrogen atmosphere and keep it for 3h; room temperature. The product was dissolved in water, washed repeatedly until neutral, then added with 6M hydrochloric acid to reflux for 2 hours, filtered, washed with deionized water until neutral, and dried in vacuum. Put the obtained solid powder into a ro...

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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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