Supercapacitor spherical active carbon preparation method

A spherical activated carbon and supercapacitor technology, which is applied in the preparation of supercapacitor electrode materials and the preparation of starch-based high specific surface area spherical activated carbon, can solve the problems of low starch carbonization rate and achieve easy operation, simple production process and good rate performance Effect

Inactive Publication Date: 2016-01-13
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents all directly carbonize starch in a carbonization furnace to obtain starch-based carbon. The hydroxyl groups of cellulose in starch are not easy to dehydrate and are easy to convert to L-glucose. The carbonization rate of starch is low.

Method used

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  • Supercapacitor spherical active carbon preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Mix potato starch with a particle size of 100 microns, such as potato starch, and ammonium dihydrogen phosphate at a solid mass ratio of 8:1, dissolve in an appropriate amount of distilled water, and prepare a starch solution with a mass percentage concentration of 10%. Spray drying to obtain a dry starch mixture, which includes starch and catalyst ammonium dihydrogen phosphate;

[0025] Step 2: Put the spray-dried starch mixture in a tube-type resistance furnace, raise the temperature to 150-240°C under an inert atmosphere of nitrogen or argon for 4-6 hours of stabilization treatment, and obtain a starch-based product with a primary pore structure. carbon microspheres;

[0026] Step 3: Mix starch-based carbon microspheres with saturated KOH solution at a mass ratio (starch: KOH) of 1:3, dry the water and place it in a resistance furnace for activation. The activation temperature is 500~800°C under an inert atmosphere. The activation time is 1~8h, and it is tak...

Embodiment 2

[0029] Step 1: Mix bean starch with a particle size of 100 microns, such as pea starch, with ammonium hydrogen phosphate at a solid mass ratio of 5:1, dissolve in an appropriate amount of distilled water, and make a starch solution with a mass percentage concentration of 5%, and spray it Dry to obtain a dry starch mixture, which includes starch and catalyst ammonium hydrogen phosphate;

[0030] Step 2: Put the spray-dried starch mixture in a tubular resistance furnace, heat up to 200-300°C in an inert atmosphere for stabilization treatment for 4-10 hours, and obtain starch-based carbon microspheres with primary pore structure;

[0031] Step 3: Mix starch-based carbon microspheres with saturated NaOH solution at a mass ratio (starch: NaOH) of 1:10, dry the water and place it in a resistance furnace for activation. The activation temperature is 500~800°C under an inert atmosphere. The activation time is 1~8h, and it is taken out after cooling, and the activated product obtained ...

Embodiment 3

[0034]Step 1: mix fruit starch with a particle size of 100 microns, such as chestnut starch and phosphoric acid at a solid mass ratio of 10:1, dissolve in an appropriate amount of distilled water, and make a starch solution with a concentration of 30% by mass percentage, and mix the starch solution with Spray drying to obtain a dry starch mixture, which includes chestnut starch and phosphoric acid;

[0035] Step 2: Put the spray-dried starch mixture in a tubular resistance furnace, heat up to 300-500°C under an inert atmosphere for stabilization treatment for 4-6 hours, and obtain starch-based carbon microspheres with a primary pore structure;

[0036] Step 3: Mix starch-based carbon microspheres and KOH saturated easily according to the mass ratio (starch: KOH) of 1:4, dry the water and place it in a resistance furnace for activation. The activation temperature is 500~900°C under an inert atmosphere. The activation time is 1~8h, and it is taken out after cooling, and the acti...

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Abstract

The present invention discloses a supercapacitor spherical activated carbon preparation method, which comprises: mixing starch and a catalyst in water to prepare a starch aqueous solution, and carrying out spray-drying to obtain a dried starch mixture; carrying out heating and stabilization treatment on the dried starch mixture in an inert atmosphere to obtain starch-based carbon microspheres; and uniformly mixing the starch-based carbon microspheres and an activator, drying the water, heating under an inert atmosphere, activating, cooling, taking out, and washing the activated product to achieve a neutral state to obtain the starch-based active carbon microspheres. According to the present invention, the supercapacitor spherical activated carbon maintain the good starch sphere, and the prepared supercapacitor adopting the supercapacitor spherical activated carbon as the supercapacitor electrode has excellent electrochemical performance, and has high electrical capacitance and good cycle stability under high current conditions.

Description

technical field [0001] The invention relates to the preparation of a starch-based spherical activated carbon with a high specific surface area, which belongs to the preparation technology of supercapacitor electrode materials, and particularly relates to a preparation method of the activated carbon. Background technique [0002] At present, in many application fields, the power density requirements of energy storage devices are getting higher and higher, which has exceeded the capacity of current batteries. In this context, a new type of energy storage device between traditional physical capacitors and secondary batteries, taking into account the advantages of both power density and energy density --- supercapacitors have been rapidly developed. Developed countries have been committed to the research and development of supercapacitors, and some products have been commercialized one after another. Supercapacitor is one of the very important areas in the development of electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 黄兴兰王瑨王睿李明科
Owner 中国东方电气集团有限公司
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