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One-step preparation method of hollow spherical porous graphite for supercapacitor

A technology of porous graphene and supercapacitor, applied in graphene, nano-carbon and other directions, can solve the problems of complex preparation process, harsh preparation conditions and high production cost, and achieve the effect of simplifying preparation steps, obvious energy saving effect and reducing preparation cost.

Active Publication Date: 2014-05-14
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method produces graphene materials, the preparation process of this method is cumbersome, the preparation conditions are harsh, the requirements for raw materials are high, and the production cost is high.
[0004] Generally speaking, the preparation process of the above-mentioned method is relatively complicated, and the production cost is very high.

Method used

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  • One-step preparation method of hollow spherical porous graphite for supercapacitor
  • One-step preparation method of hollow spherical porous graphite for supercapacitor
  • One-step preparation method of hollow spherical porous graphite for supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: hollow spherical porous graphene HSPG 3-18-6-Ar Concrete preparation process is as follows:

[0021] (1) Pretreatment of reactants: Coal tar pitch with 26.2% n-hexane soluble matter was used as raw material, after the coal tar pitch was ground, 3g of coal tar pitch with a particle size of less than 74μm was weighed and put into a mortar, and 18g of nano Magnesium oxide, then add 6g of solid potassium hydroxide, mix and grind the three raw materials of gained to obtain reactant after 1h;

[0022] (2) Preparation of hollow spherical porous graphene: Put the reactants obtained in step (1) into a corundum boat, then place the corundum boat in a tube furnace, and pass argon gas at a flow rate of 60mL / min for 10min to dissolve the The air in the tube furnace is exhausted, so that the gas in the tube furnace is under normal pressure of 1 atmosphere, and then the tube furnace is heated to 150°C at a heating rate of 5°C / min, and after constant temperature for 0.5h...

Embodiment 2

[0023] Embodiment 2: hollow spherical porous graphene HSPG 3-18-6-N2 Concrete preparation process is as follows:

[0024] (1) Pretreatment of reactants: implemented in the same manner as step (1) in Example 1.

[0025] (2) Preparation of hollow spherical porous graphene: the same method as step (2) in Example 1 was implemented, except that the inert gas introduced was nitrogen. The resulting hollow spherical porous graphene is labeled as HSPG 3-18-6-N2 .

Embodiment 3

[0026] Embodiment 3: hollow spherical porous graphene HSPG 3-18-6 Concrete preparation process is as follows:

[0027] (1) Pretreatment of reactants: implemented in the same manner as step (1) in Example 1.

[0028] (2) Preparation of hollow spherical porous graphene: implement according to the same method as step (2) in Example 1, the difference is that the inert gas introduced is nitrogen, and a vacuum pump is used to extract the part of the gas in the tube furnace so that the gas pressure in the tube furnace is between -0.05MPa and -0.1MPa. The resulting hollow spherical porous graphene is labeled as HSPG 3-18-6 .

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Abstract

The invention discloses a one-step preparation method of a hollow spherical porous graphite for a supercapacitor and belongs to the technical field of carbon material preparation. In the one-step preparation method, plastic coal pitch serves as a carbon source, nanometer magnesia serves as a guiding template, potassium hydroxide serves as an activating agent, and a mixture formed by grinding and mixing three raw materials by using a dry method is transferred to a corundum crucible, the corundum crucible is arranged in a tubular furnace to be heated under the condition of ordinary pressure or negative pressure, and the hollow spherical porous graphite material for the supercapacitor is prepared by using the one-step preparation method. The one-step preparation method directly uses the cheap aromatic-ring-rich coal pitch as a raw material, a preparation process is greatly simplified, and the operation safety is improved. The one-step preparation method has the advantages of being simple in process, low in cost, suitable for industrial production and the like. The prepared hollow spherical porous graphite is used as a supercapacitor electrode, the specific volume of the supercapacitor electrode in 6MKOH electrolyte under the condition of 20A / g large-current density reaches to 194-244F / g, and good rate performance and high specific volume are displayed.

Description

Technical field: [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a one-step method for preparing hollow spherical porous graphene for supercapacitors. Background technique: [0002] As a new type of energy storage element, supercapacitor has attracted extensive attention. Graphene is a flat film material with high strength, good electrical conductivity, thermal conductivity, and large specific surface area. It is an ideal electrode material for supercapacitors. However, the current specific volume of graphene electrode materials is not high. The main reason is that during the electrode preparation process, due to the strong van der Waals force between the graphene sheets, the graphene sheets are piled up again, resulting in electrolyte ions It is difficult to form an effective electric double layer capacitance in the narrow space between graphene sheets, resulting in low utilization of its specific surface are...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184
Inventor 何孝军张和宝
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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