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Two-step activation preparation method of activated carbon and application thereof in supercapacitor

A technology of supercapacitor and activated carbon, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of large capacitance of activated carbon, low microporosity of activated carbon, low electrochemical capacity, etc., and achieve the effect of reducing corrosion, improving activation effect and large specific surface area.

Active Publication Date: 2016-11-23
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the disadvantages of the supercapacitor technology prepared by using coal-based activated carbon as the electrode material include: (1) the electrochemical capacity of the supercapacitor prepared by general commercial activated carbon is generally low; (2) the activated carbon prepared by the physical activation method has low microporosity and low electrical Low capacity; (3) Activated carbon prepared by alkali activation method has large capacity, but high cost and easy to corrode equipment

Method used

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  • Two-step activation preparation method of activated carbon and application thereof in supercapacitor
  • Two-step activation preparation method of activated carbon and application thereof in supercapacitor
  • Two-step activation preparation method of activated carbon and application thereof in supercapacitor

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Embodiment 1

[0035] The preparation method of activated carbon material for the supercapacitor of this embodiment is carried out in the following steps:

[0036] 1. After pulverizing anthracite with an ash value of 3.8%, passing through a 200-mesh sieve, adding 4% potassium nitrate additive and 6% coal tar binder and stirring for 5 minutes to prepare a mixture;

[0037] 2. Mold the mixture layer in step 1, put it into the muffle furnace and raise the temperature to the final temperature of 570°C at a heating rate of 15°C / min, cool to obtain the carbonized material, and then transfer it to a tube-type activation furnace at 750°C. Activation with water vapor for 2 hours to obtain primary activated carbon;

[0038] 3. Wash the primary activated activated carbon in step 2 with a concentration of 0.6mol / L dilute hydrochloric acid for 3 times at 60°C, wash it with distilled water until the pH value is 7, and then wash it with a concentration of 12mol at 30°C. / L of KOH solution for 6 hours;

...

Embodiment 2

[0042] The preparation method of activated carbon material for the supercapacitor of this embodiment is carried out in the following steps:

[0043]1. After pulverizing anthracite with an ash value of 6%, pass it through a 200-mesh sieve, add 5% potassium nitrate additive and 8% coal tar binder and stir for 6 minutes to prepare a mixture;

[0044] 2. Shape the layered mixture in step 1, put it into the muffle furnace and raise the temperature to the final temperature of 600°C at a heating rate of 5°C / min, cool to obtain the carbonized material, and then transfer it to a tube-type activation furnace at 700°C. Into CO 2 Gas activation for 1.5h to produce activated carbon once;

[0045] 3. The primary activated activated carbon in step 2 is acid-washed once with dilute hydrochloric acid with a concentration of 0.5mol / L at 70°C, washed with distilled water until the pH value is 7, and then used at 30°C with a concentration of 8mol / L of KOH solution for 10h;

[0046] 4. Put the...

Embodiment 3

[0049] The preparation method of activated carbon material for the supercapacitor of this embodiment is carried out in the following steps:

[0050] 1. After pulverizing anthracite with an ash value of 8%, pass it through a 200-mesh sieve, add 2% potassium nitrate additive and 5% coal tar binder and stir for 10 minutes to prepare a mixture;

[0051] 2. Shape the layered mixture in step 1, put it into the muffle furnace and raise the temperature to a final temperature of 560°C at a heating rate of 8°C / min, cool to obtain carbonized material, and then transfer it to a tubular activation furnace at 850°C, and pass Activated by entering water vapor for 1.3h to make primary activated carbon;

[0052] 3. The primary activated activated carbon in step 2 is acid-washed twice with a concentration of 1mol / L dilute hydrochloric acid at 75°C, washed with distilled water until the pH value is 7, and then used at a concentration of 15mol / L at 30°C. Immerse in L of KOH solution for 1h;

[...

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Abstract

The invention discloses a two-step activation preparation method of activated carbon and application thereof in a supercapacitor. The method comprises the following steps that blind coal is smashed and sieved, and an additive and a binder are added to be stirred; the mixture is added into a muffle furnace to be carbonized and then, shifted into a tubular activating oven, activated gas is introduced to be activated; diluted hydrochloric acid is used for acid pickling, filtering is performed, then, distilled water is used for washing, and a KOH solution is used for dipping; one-time activated carbon is placed into the activating oven, and protective gas is introduced to be activated; diluted hydrochloric acid is used for acid pickling, filtering is performed, then, distilled water is used for washing till pH is 7, and then drying is performed; reactivated de-ashing activated carbon is uniformly mixed with ethylene and polytetrafluoroethylene after being ground, the mixture coats foamed nickel, and after drying is performed, tabletting is performed to prepare the supercapacitor. Blind coal is adopted as a raw material, reaction conditions are mild, on the basis of the conventional activated carbon production technology, reactivation and de-ashing are performed, the synthesis cost is greatly lowered, and the huge application and popularization potential is achieved in the field of activated carbon for the high-performance supercapacitor.

Description

technical field [0001] The invention relates to the field of preparation of activated carbon materials, in particular to a two-step activation preparation method of activated carbon and its application in supercapacitors. Background technique [0002] Supercapacitors have the advantages of high energy density, high power density, long cycle life, good stability, high and low temperature tolerance, and fast charge and discharge, and have become a research hotspot for energy storage devices. Activated carbon is commonly used as an electrode material for supercapacitors because of its good stability, large specific surface area and reasonable price. There is a close relationship between the pore size, pore shape and structure of the activated carbon itself and the surface properties of the internal pores and the electrochemical performance of the supercapacitor. Not all pores in the activated carbon can form an electric double layer. Therefore, the preparation is suitable as T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B31/12H01G11/32
CPCY02E60/13H01G11/32C01P2006/12C01P2006/14C01P2006/16C01P2006/17C01P2006/40
Inventor 岳晓明张双全吴雅俊朱俊生杨小芹
Owner CHINA UNIV OF MINING & TECH
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