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Preparation method of porous carbon material for supercapacitor

A supercapacitor and porous carbon technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of low specific capacitance and large impact of Cl2 environment, and achieve the effect of high and medium porosity and large specific surface area

Active Publication Date: 2011-02-16
TIG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific surface area prepared by this method is only about 1200m2 / g, not only the specific capacitance is low, but also the Cl2 produced in the production process has a great impact on the environment

Method used

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  • Preparation method of porous carbon material for supercapacitor
  • Preparation method of porous carbon material for supercapacitor
  • Preparation method of porous carbon material for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100 g of petroleum coke, add it to 2000ml of 10% H2O2 solution, mix well and soak for 4 hours, filter and use a centrifuge to remove the residual H2O2 solution. Mix the above-mentioned oxidized petroleum coke raw material with 150g of a mixture of KOH and Ca(OH)2 with a mass ratio of 2:1.5, slowly heat to 300~350°C at a heating rate of 2°C / min, and stir for 2 hours. After granulation, put it into a tube furnace, heat it up to a temperature of 500°C at a heating rate of 2°C / min, and start to pass in water vapor for secondary activation treatment, and the flow rate of water vapor is 0.5 L / h. Continue heating at a heating rate of 2°C / min to a temperature of 800°C, and activate at this temperature for 1 hour. After the activated product is cooled, add water to wash repeatedly to pH ≤ 10, add 10% HCl solution to soak for 5 hours, continue to add water to wash to pH ≤ 8, filter and dry at 100-110 ° C to obtain the prepared porous carbon material.

[0029] The above-men...

Embodiment 2

[0032]Take 100 g of petroleum coke, add it to 2000ml of 10% NaNO3 solution, mix well and soak for 6 hours, filter and use a centrifuge to remove the residual NaNO3 solution. Mix the above-mentioned oxidized petroleum coke raw material with 150g of a mixture of KOH and Ca(OH)2 with a mass ratio of 2:1.5, slowly heat to 350°C at a heating rate of 2°C / min, and stir for 2 hours. After granulation, put it into a tube furnace, heat it up to a temperature of 600°C at a heating rate of 2°C / min, and start to pass in water vapor for secondary activation treatment. The flow rate of water vapor is 0.5 L / h. Continue heating at a heating rate of 2°C / min to a temperature of 800°C, and activate at this temperature for 1 hour. After the activated product is cooled, add water to wash repeatedly to pH ≤ 10, add 10% HCl solution to soak for 5 hours, continue to add water to wash to pH ≤ 8, filter and dry at 100-110 ° C to obtain the prepared porous carbon material.

[0033] The above-mentioned p...

Embodiment 3

[0036] Take 100 g of pitch coke, add it to 1500ml of 10% H2O2 solution, mix well and soak for 5 hours, filter and use a centrifuge to remove the residual H2O2 solution. The above-mentioned oxidized petroleum coke raw material was mixed with 200g of a mixture of NaOH and Ca(OH)2 with a mass ratio of 2:1, slowly heated to 350°C at a heating rate of 2°C / min, and stirred for 3 hours. After granulation, put it into a tube furnace, heat it up to 600°C at a heating rate of 2°C / min, and start to pass in water vapor for secondary activation treatment with a flow rate of 0.8 L / h. Continue heating at a heating rate of 2°C / min to a temperature of 900°C, and activate at this temperature for 1.5h. After the activated product is cooled, add water to wash repeatedly to pH ≤ 10, add 10% HCl solution to soak for 5 hours, continue to add water to wash to pH ≤ 8, filter and dry at 100-110 ° C to obtain the prepared porous carbon material.

[0037] The above-mentioned porous carbon material was f...

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Abstract

The invention provides a preparation method of porous carbon materials for a supercapacitor, in the preparation method, with refinery coke or pitch coke as raw materials and composite alkali metal hydroxide as an activating agent, the porous carbon material is prepared by using a two-stage activation process. The obtained porous carbon material has a specific surface area of 1500-1800m2 / g, has good adsorptive property and narrow aperture distribution, and the aperture distribution can be regulated according to requirements. A supercapacitor electrode made of the porous carbon materials has the characteristics of high capacity, high power, long cycle life, and the like. The preparation method has the characteristics of low hydroxid usage, simple production technology, and the like and is convenient to practicability.

Description

technical field [0001] The invention relates to a preparation method of a porous carbon material, in particular to a preparation method of a porous carbon material for a supercapacitor. Background technique [0002] Porous carbon materials are used as electrode materials for supercapacitors, and their performance mainly depends on the internal pore structure, including pore size distribution, pore shape, and pore volume. Effectively controlling the pore structure is the key to obtaining high-performance porous carbons. The porous carbon prepared by the KOH chemical activation method developed in recent years has the characteristics of large specific surface area and high capacitance, but its pore size distribution is concentrated in the micropore range below 2nm, which is only suitable for inorganic substances such as H2SO4 or KOH as electrolytes. Aqueous supercapacitors. In addition, since the amount of KOH used is 3 to 5 times that of carbonaceous raw materials, not only ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042C01B31/02
CPCY02E60/13
Inventor 刘洪波夏笑红杨国庆李兵
Owner TIG TECH CO LTD
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