Method for preparing activated carbon for super capacitor with fruit shells as raw material and application of activated carbon

A technology of supercapacitor and activated carbon, which is applied in the preparation of activated carbon for supercapacitor and the field of activated carbon for supercapacitor, can solve the problems of inability to completely remove the surface functional groups of activated carbon, high cost, and general impurity removal effect, and achieves improved cycle life and reduced Preparation cost, the effect of reducing the bloating phenomenon

Inactive Publication Date: 2015-03-11
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material of this method is petroleum coke, and the cost is relatively high; the impurity removal effect is general by using a single acid; the heat treatment at a lower temperature cannot completely remove the functional groups on the surface of the activated carbon

Method used

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  • Method for preparing activated carbon for super capacitor with fruit shells as raw material and application of activated carbon
  • Method for preparing activated carbon for super capacitor with fruit shells as raw material and application of activated carbon
  • Method for preparing activated carbon for super capacitor with fruit shells as raw material and application of activated carbon

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Experimental program
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Effect test

Embodiment 1

[0051] 2.5 kg each of the selected walnut shells, apricot shells and coconut shells were placed in a nitrogen-filled box furnace, and carbonized at 350 ° C for 2 hours. After the carbonized material is cooled, use a planetary ball mill to grind to a particle size (D50) of 15 μm, then mix it with sodium hydroxide particles at a ratio of 1:1 (mass ratio), and then place it in a nitrogen-filled box furnace at 650 ° C Activate for 1 hour. After the activated product is immediately injected with water and washed twice, use a mixed acid of hydrochloric acid and sulfuric acid, heat to 80°C to remove impurities for 5 hours, wash with water until neutral, then dry at 250°C under the protection of nitrogen, and sinter at 760°C to obtain the activated carbon product.

[0052] The activated carbon is prepared into a supercapacitor, wherein the water-based supercapacitor is mixed with reference to the mass ratio of activated carbon: carbon black conductive agent (SP): binder polytetrafluor...

Embodiment 2

[0056] 2.5 kg each of the selected walnut shells, apricot shells and coconut shells were placed in a nitrogen-filled box furnace, and carbonized at 350 ° C for 2 hours. After the carbonized material is cooled, use a planetary ball mill to grind to a particle size (D50) of 15 μm, then mix it with sodium hydroxide particles at a ratio of 1:1 (mass ratio), and then place it in a nitrogen-filled box furnace at 550 ° C Activate for 1 hour. After the activated product is immediately injected with water and washed twice, use a mixed acid of hydrochloric acid and sulfuric acid, heat to 80°C to remove impurities for 5 hours, wash with water until neutral, then dry at 250°C under the protection of nitrogen, and sinter at 760°C to obtain the activated carbon product.

Embodiment 3

[0065] 2.5 kg of the selected coconut shells were placed in a nitrogen-filled box furnace and carbonized at 390° C. for 1 hour. After the carbonized material is cooled, crush it to 0.5-5mm with a pulverizer, mix it with sodium hydroxide at a ratio of 1:2, place it in a nitrogen-filled box furnace, and activate it at 650°C for 1 hour. After the activated product is immediately injected with water and washed twice, take 1 times the weight of 37% hydrochloric acid and 1 times the weight of 98% concentrated sulfuric acid, heat it to 80°C to remove impurities for 5 hours, wash it with water until neutral, and then store it at 250°C under nitrogen protection. Drying, sintering at 850°C to obtain activated carbon products, that is, activated carbon products.

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Abstract

The invention relates to a method for preparing activated carbon for a super capacitor with fruit shells as raw material and an application of the activated carbon. The method comprises the following steps: firstly carbonizing the fruit shells in a protective atmosphere, then crushing the carbonized material, mixing with an alkaline activator, heating up to 550-690 DEG C, and activating in the protective atmosphere; and washing the obtained activated material with water, removing impurities by using a mixed acid, then drying, heating up to 760-1000 DEG C, and removing functional groups of the activated carbon surface. The prepared activated carbon has the characteristics of low cost and high performance, the flatulence problem of the super capacitor can be effectively inhibited, and the cycle life of the super capacitor is extended.

Description

technical field [0001] The invention belongs to the technical field of new energy and new materials, and in particular relates to a method for preparing activated carbon for supercapacitors and its application, in particular to a method for preparing activated carbon for supercapacitors using hard fruit shells as raw materials and its application. Background technique [0002] Activated carbon is prepared from materials such as carbonized coconut shell, petroleum coke or coal coke with a porous structure. Activated carbon, which has a large specific surface area due to its porosity, has been widely used as absorbents, catalyst supports, and electrode materials for double-layer capacitors and lithium secondary batteries. In particular, electric double layer capacitors for hybrid vehicles and the like require high energy density, that is, capacitance, and thus activated carbons with reasonable pore size distribution, high crystallinity, and large surface area need to be used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 李勇汪福明岳敏任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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