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Active carbon for super capacitor and a preparation method thereof

A supercapacitor and activated carbon technology, which is applied in the manufacture of capacitors, hybrid/electric double layer capacitors, electrolytic capacitors, etc., to achieve the effects of low production costs, simple preparation methods, and low prices

Inactive Publication Date: 2009-09-09
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there are no reports on the preparation of supercapacitor electrode materials from starch at home and abroad.

Method used

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  • Active carbon for super capacitor and a preparation method thereof
  • Active carbon for super capacitor and a preparation method thereof
  • Active carbon for super capacitor and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of activated carbon for supercapacitor provided by the invention, its steps are as follows:

[0024] 1) drying the starch with moisture; the starch is oxidized cross-linked starch, corn cationic starch, graft copolymerized starch, soluble starch or tapioca starch;

[0025] 2) Take the dried starch and place it in a resistance furnace, raise the temperature to 350-550°C under the protection of an inert gas, keep the temperature constant for 1-4 hours, take it out after cooling, and obtain the carbonized material;

[0026] 3) Grind the carbonized material and mix it evenly with the saturated solution of potassium hydroxide, dry the water and place it in a resistance furnace, raise the temperature to 750-850°C under the protection of an inert gas, keep the temperature for 1-4 hours, take it out after cooling, and grind it. It is washed until neutral and dried to obtain the product; the weight ratio of the carbonized material to potassium hydroxide so...

Embodiment 1

[0030] Weigh 10g of oxidized cross-linked starch, bake it in an oven at 120°C for 12h, place it in a stainless steel container and place it in a tubular resistance furnace, and then use a temperature controller to control the temperature rise rate to 1°C / min under the protection of Ar inert gas Raise the temperature to 350°C and keep the temperature constant for 4 hours to carbonize the starch into starch coke. The obtained starch coke was crushed to 150 mesh and mixed with KOH saturated solution (starch coke: KOH solid = 1:4, weight ratio, the same below); baked in an oven at 120°C for 24 hours, then placed in a tubular resistance furnace, Then, under the protection of Ar inert gas, the temperature was raised to 850°C at a rate of 1°C / min controlled by a temperature controller, kept at a constant temperature for 1.5h, and then naturally cooled to room temperature. Take it out and grind it to 150 mesh with a mortar, add an appropriate amount of hot water, stir for 12 hours und...

Embodiment 2

[0035] The starch used was 10 g of corn cationic starch, and the carbonization and activation conditions were the same as in Example 1. The measured specific surface area of ​​the obtained activated carbon is 1876.2m 2 / g.

[0036]The obtained starch activated carbon was used as an electrode material to assemble a simulated supercapacitor, and the electrochemical performance test was carried out in 30% KOH electrolyte aqueous solution. The electrochemical performance test was carried out under the condition of current density of 0.5A / g and charge-discharge voltage of 0.00-1.20V. The first cycle specific capacity was 184.3F / g, the charge-discharge curve showed a typical triangular symmetrical distribution, and the cyclic voltammetry curve A relatively regular rectangle.

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Abstract

The invention relates to an electrode material for an electrochemical super capacitor, more particularly to an active carbon for the super capacitor and a preparation method thereof. The inventive active carbon for the super capacitor is obtained by the steps of drying, carbonizing and activating starch that is taken as raw material. The preparation method thereof comprises the following steps of: 1) drying moisture in the starch; 2) putting the dried starch in an electric resistance furnace to be heated up to 350-550 DEG C under the protection of an inert gas, keeping constant temperature for 1-4 hours, and taking out after cooling to obtain a carbonizing material; 3) grinding and mixing the carbonizing material with potassium hydroxide saturated solution uniformly, drying the moisture and putting the mixture in the electric resistance furnace to be heated up to 750-850 DEG C under the protection of the inert gas, keeping constant temperature for 1-4 hours, and taking out the mixture after cooling to be ground, washing to a neutral state and drying to obtain the active carbon; the proportion by weight of the carbonizing material to potassium hydroxide solid is 1:4-8. The invention has extensive source of the raw materials, high specific surface area of the prepared active carbon and low production cost.

Description

Technical field: [0001] The invention relates to an electrode material for an electrochemical supercapacitor, in particular to an activated carbon for a supercapacitor; the invention also relates to a preparation method of the activated carbon. Background technique: [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device that is 20 to 200 times larger than conventional capacitors. It has excellent pulse charge and discharge performance, large energy storage (more than 2.5W·h·kg-1 specific energy), high power (more than 500W·kg-1 specific power), light weight, long cycle life (more than 100,000 times) , Wide operating temperature (-40℃~60℃) and fast charging (less than 3min) and other excellent characteristics. Moreover, supercapacitors do not need maintenance throughout their life, and are environmentally friendly and pollution-free after use, so they are also called green energy. Based on the excellent characteristics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08H01G9/20H01G9/058H01G9/042H01G11/32H01G11/86
CPCY02E60/13
Inventor 王红强李泽胜李庆余张初华王艳芳陈美超胡思江王芳平
Owner GUANGXI NORMAL UNIV
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