A kind of composite petroleum coke-based activated carbon and its preparation method, supercapacitor

An activated carbon and composite technology, applied in hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., can solve the problems of high internal resistance, far difference in energy density, low specific capacity, etc.

Active Publication Date: 2019-04-26
SHANDONG OBO NEW MATERIAL CO LTD
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  • Abstract
  • Description
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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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  • A kind of composite petroleum coke-based activated carbon and its preparation method, supercapacitor
  • A kind of composite petroleum coke-based activated carbon and its preparation method, supercapacitor
  • A kind of composite petroleum coke-based activated carbon and its preparation method, supercapacitor

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preparation example Construction

[0044] The invention provides a kind of preparation method of composite petroleum coke-based activated carbon, comprising the following steps:

[0045] A) After coking the petroleum coke particles treated with the oxidative medium under the condition of the first gas, an activated carbon precursor is obtained;

[0046] B) after the activated carbon precursor obtained in the above steps is mixed with alkali, preactivation is carried out under the condition of the second gas, and then activated under the condition of the third gas, and then the activated carbon dispersion is obtained after washing;

[0047] C) mixing the activated carbon dispersion obtained in the above steps with the graphene oxide solution, drying, and then heat-treating under protective gas conditions to obtain a composite petroleum coke-based activated carbon.

[0048] In the present invention, firstly, the petroleum coke particles treated with an oxidative medium are coked under the condition of the first gas...

Embodiment 1

[0076] Take 100g of high-quality petroleum coke and crush it into 8-12μm particles, add 500mL of 30% hydrogen peroxide, heat to 50°C and soak for 2h, filter, wash, and dry; heat to 450°C under air for 45min, cool naturally, add 100g of powder of KOH and mix well. 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; . Dissolve the product in water, wash repeatedly until neutral, then add 6M hydrochloric acid to reflux for 2 hours, filter, wash with deionized water until neutral; add deionized water to make a 5% aqueous dispersion; add solid A monolayer graphene oxide solution (0.5%, 100 mL) with a content of 0.5 g and 0.5 g of melamine was ultrasonically stirred for 1 h and spray-dried. Put the obtained solid powder into a rotary furnace, raise the temperature to 800° C. under 10% hydrogen-nitrogen mixed gas and keep it for 2 hours, cool down, and magnetically separate to obtain su...

Embodiment 2

[0082] Take 100g of high-quality petroleum coke and crush it into 50-100μm particles, add 500mL of 1M nitric acid and reflux for 6h, filter, wash, and dry; heat the material to 350°C under air for 60min, and cool naturally. Add 50g KOH dissolved in ethanol to the material, mix evenly and heat to remove the solvent. Put this mixture into a metal nickel crucible, raise the temperature to 500°C at a rate of 10-20°C / min under nitrogen atmosphere and keep it for 1h; . Dissolve the product in water, wash repeatedly until neutral, then add 6M hydrochloric acid to reflux for 2 hours, filter, wash with deionized water until neutral; add deionized water to make a 5% aqueous dispersion; add solid A monolayer graphene oxide solution (0.5%, 100 mL) with a content of 0.2 g and 2.0 g of melamine was ultrasonically stirred for 1 h, and then spray-dried. Put the obtained solid powder into a rotary furnace, raise the temperature to 850°C under 10% ammonia-argon gas mixture and keep it for 1.5...

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Abstract

The invention provides a composite petroleum coke-based activated carbon and a preparation method thereof. The invention can form activated active points on the surface of petroleum coke through the process of oxidizing medium impregnation, coking and pre-activation, which is conducive to the formation of pores in the chemically activated part and reduces the The amount of alkali used can increase the mesoporosity, overcome the problems of dense surface of petroleum coke and difficult pore formation; use graphene oxide to reduce to graphene to form a conductive network, improve the conductivity of activated carbon, and reduce its internal resistance; jointly carry out high temperature Heat treatment reduces surface functional groups and improves the stability of supercapacitive carbons. The composite petroleum coke-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 composite petroleum coke-based activated carbon, a preparation method thereof, 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 act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/336H01G11/32H01G11/44
CPCC01B32/342H01G11/34Y02E60/13
Inventor 刘海波张在忠董士光胡兴华
Owner SHANDONG OBO NEW MATERIAL CO LTD
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