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Method for preparing ultracapacitor-used porous grapheme material

A porous graphene and supercapacitor technology, applied in the field of preparing porous graphene materials for supercapacitors, can solve the problems of low graphitization degree, complicated preparation process, and large environmental pollution of ordinary porous carbon materials, and achieve easy removal and abundant sources , the effect of reducing energy consumption

Inactive Publication Date: 2014-10-15
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The results of literature search show that the existing methods mainly focus on the preparation of conventional porous carbon materials. The preparation process is complex, the energy consumption is large, the degree of graphitization of the prepared ordinary porous carbon materials is low, and the environmental pollution is relatively large.
There are few reports on the preparation of porous graphene in existing methods

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] Porous graphene PG 4.2-16.8-6-NP The specific preparation process is as follows:

[0027] (1) Pretreatment of reactants: take 4.2g of coal tar pitch powder with a particle size less than 74 microns and put it into a mortar, add 16.8g of nano-calcium carbonate, and then add 6g of potassium hydroxide solid, and the mixture of the three obtained is ground evenly to obtain Reactant.

[0028] (2) Preparation of porous graphene material: put the reactant obtained in step (1) into a corundum porcelain boat, then place the corundum porcelain boat in a tube furnace, feed nitrogen in advance (flow rate is 60mL / min ) exhaust the air in the tube furnace, then pump the pressure in the tube furnace to -0.1MPa, and heat the tube furnace to 200°C at a heating rate of 5°C / min, Constant temperature for 0.5h, continue to heat the tube furnace to 750°C at a temperature increase rate of 5°C / min, keep the temperature constant for 1h, continue to heat the tube furnace to 950°C at a temperat...

Embodiment 2

[0030] Porous graphene PG 4.2-16.8-6-N2 The specific preparation process is as follows:

[0031] (1) Pretreatment of reactants: implement according to the same method as step (1) in Example 1.

[0032] (2) implement according to the same method as step (2) in embodiment 1, the difference is that the air pressure in the tube furnace is normal pressure, feeds N 2 The flow rate is 60mL / min, and the resulting porous graphene is marked as PG 4.2-16.8-6-N2 , its TEM photo is attached image 3shown. PG 4.2-16.8-6-N2 As supercapacitor electrode material in BMIMPF 6 Under the current density of 0.05A / g in the ionic liquid electrolyte, its specific volume is as high as 115F / g, PG 4.2-16.8-6-N2 The usable energy density of supercapacitors is as high as 65Wh / kg.

Embodiment 3

[0034] Porous graphene PG 4.2-16.8-6-Ar The specific preparation process is as follows:

[0035] (1) Pretreatment of reactants: implement according to the same method as step (1) in Example 1.

[0036] (2) implement according to the same method as step (2) in embodiment 2, difference is that the air pressure in the tube furnace is normal pressure, the flow that passes into argon is 60mL / min, and the gained porous graphene mark is PG 4.2-16.8-6-Ar , its TEM photo is attached Figure 4 shown. PG 4.2-16.8-6-Ar As supercapacitor electrode material in BMIMPF 6 Under the current density of 0.05A / g in the ionic liquid electrolyte, its specific volume is as high as 111F / g, PG 4.2-16.8-6-Ar The available energy density of supercapacitors is as high as 63Wh / kg.

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Abstract

The invention discloses a method for preparing an ultracapacitor-used porous grapheme material, and belongs to the technical field of carbon material preparation. According to the method, coal pitch is used as the carbon source, nanometer calcium carbonate is used as a template, and potassa is used as an activating agent; the three components are ground in a dry method; the mixture is transferred to a corundum ceramic boat, is placed in a pipe furnace, and is subjected to heating activation under a normal pressure condition or a negative pressure condition to directly obtain the ultracapacitor-used porous grapheme material. The method adopts cheap coal pitch and nanometer calcium carbonate as the raw materials, and has the advantages being simple in technology, low in cost, suitable for industrialized production and the like; the material has a specific surface area within the range of 1330-1946 m<2> / g and an average aperture within the range of 2.32-3.08 nm, and can exhibit relatively high volume and energy intensiveness when being used as an electrode material of an ultracapacitor.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a method for preparing a porous graphene material for a supercapacitor. Background technique [0002] Supercapacitor has the advantages of high power density, long cycle life, fast charge and discharge rate, etc. It is a new type of energy storage element. It is mainly composed of an electrode composed of a current collector loaded with a porous material, a separator placed between the two electrodes, and an electrolyte. As a by-product of coking, coal tar pitch has the advantages of cheapness, easy availability, low ash and high carbon content. Coal tar pitch contains a large number of aromatic ring hydrocarbon molecules, the carbon hybridization method in this aromatic ring and the SP in graphene materials 2 The structure of the hybrid carbon is very similar, that is to say, the aromatic ring hydrocarbon molecules in coal tar pitch can be regar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 何孝军张浩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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