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Activated carbon material and preparation method thereof and supercapacitor

A technology of activated carbon and carbonized materials, which is applied in the fields of activated carbon materials, preparation, and supercapacitors, can solve the problems such as the inability to meet the requirements of supercapacitors for the specific surface area performance of electrode materials, the inability to ensure the charge-discharge cycle performance of supercapacitors, and the harsh chemical activation conditions. , to achieve excellent high current performance, improve specific capacitance and charge-discharge cycle performance, and achieve the effect of low price

Active Publication Date: 2015-05-13
LUOYANG YUEXING NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation of activated carbon materials is usually made of petroleum, coal, wood, fruit shell, resin, etc., and is prepared through the carbonization stage and the activation stage. The activation method is divided into chemical activation and physical activation. The chemical activation conditions are relatively harsh and consume a lot of energy. , high production cost, strong corrosiveness to equipment, dangerous operation, and large secondary pollution; compared with chemical activation, physical activation is harmless to the environment, and the activator is clean and easy to get, and the cost is low
For example, Chinese patent CN1012441819A discloses a preparation method of metal activated carbon, which uses coal-based raw material bonding metal compound as raw material, carbonizes at 400-700 ° C, and uses a mixture containing water vapor as an activator to physically activate it at 700-700 ° C. Activated at 1000°C, although the disclosed activated carbon is prepared by physical activation, which overcomes the defects of chemical activation, but the specific surface area of ​​this activated carbon mainly prepared from coal is only up to 1071m 2 / g, cannot meet the requirements of supercapacitors for the specific surface area performance of electrode materials, and cannot ensure the charge-discharge cycle performance of supercapacitors prepared using this material
[0005] Then, whether it is possible to break the conventional way of thinking of using petroleum, coal, etc. as raw materials to prepare activated carbon, and the research on using other materials as raw materials to prepare activated carbon for supercapacitors has not been reported yet.

Method used

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  • Activated carbon material and preparation method thereof and supercapacitor

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Embodiment 1

[0037] The active carbon material of this embodiment is prepared by the following preparation method with block graphite as raw material, such as figure 1 As shown, the specific operation steps are:

[0038] 1) Block graphite carbonization: select D 50 22.5μm, the specific surface area is 80m 2 / g of bulk graphite particles, in N 2 Under protection, heat up to 600°C at a heating rate of 15°C / min in a closed kiln, carbonize for 2 hours, and then cool down to room temperature to obtain carbonized material;

[0039] 2) Carbonized material activation: take 20g of the carbonized material obtained in step 1) and place it in an activation furnace, 2 Under protection, the temperature was raised to 800°C at a heating rate of 15°C / min, and the N 2 , while passing CO 2 The gas flowing out after passing through deionized water, the flow rate of the gas flowing out is controlled at 200mL / min, stop heating after 4 hours of activation, and cut off the CO 2 , at N 2 Protect and drop to...

Embodiment 2

[0042] The active carbon material of this embodiment is prepared by the following preparation method with block graphite as raw material, and the specific operation steps are:

[0043] 1) Block graphite carbonization: select D 50 20μm, the specific surface area is 90m 2 / g of bulk graphite particles, in N 2 Under protection, heat up to 500°C at a heating rate of 10°C / min in a closed kiln, carbonize for 3 hours, and then cool down to room temperature to obtain carbonized material;

[0044] 2) Activation of the carbonized material: get 30g of the carbonized material obtained in step 1) and place it in an activation furnace. 2 Under protection, the temperature was raised to 700°C at a rate of 10°C / min, and the feeding of N was stopped. 2 , while passing CO 2 The outflow of gas after deionized water, the flow rate of the outflow gas is controlled at 300mL / min, stop heating after activation for 6 hours, and cut off CO 2 , at N 2 Protect and drop to room temperature, pulverize...

Embodiment 3

[0047] The active carbon material of this embodiment is prepared by the following preparation method with block graphite as raw material, and the specific operation steps are:

[0048] 1) Carbonization of bulk graphite: select D 50 25μm, the specific surface area is 85m 2 / g of bulk graphite particles, in N 2 Under protection, heat up to 550°C at a heating rate of 10°C / min in a closed kiln, carbonize for 2.5 hours, and then cool down to room temperature to obtain carbonized material;

[0049] 2) Activation of the carbonized material: take 25g of the carbonized material obtained in step 1) and place it in an activation furnace. 2 Under protection, the temperature was raised to 750°C at a heating rate of 10°C / min, and the N 2 , while passing CO 2 The outflow of gas after deionized water, the flow rate of the outflow gas is controlled at 250mL / min, stop heating after activation for 5 hours, and cut off the CO 2 , at N 2 Protect and drop to room temperature, pulverize with a...

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Abstract

The invention discloses an activated carbon material and a preparation method thereof and a supercapacitor, which belong to the technical field of electrode materials. The activated carbon material is prepared by taking blocky graphite as a raw material through heating the blocky graphite to 500-700 DEG C at a heating rate of 10-20 DEG C / min; carbonizing the blocky graphite, and heating the blocky graphite to 700-900 DEG C at a heating rate of 0-20 DEG C / min; and feeding activation gas for activating the obtained object, so that an activated carbon material with large specific surface area, large total pore volume and high porosity is obtained. Because the blocky graphite is taken as a raw material, the activated carbon material is wide in source and low in price, thereby saving cost. The preparation method disclosed by the invention is mild in activation conditions, small in energy consumption, environmentally friendly, easy to operate, wide in raw material sources, low in cost, and suitable for large-scale industrial production. The supercapacitor disclosed by the invention takes the activated carbon material prepared according to the invention as an electrode material, so that the specific capacitance and charge-discharge cycle performance of the supercapacitor are improved, and the requirements of the supercapacitor on high specific capacitance and excellent large current properties are met.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to an activated carbon material, a preparation method and a supercapacitor. Background technique [0002] A supercapacitor is an energy storage element between a battery and a traditional capacitor based on an electrochemical process at the electrode / electrolyte interface. Its capacity comes from electric double layer capacitance and Faraday quasi-capacitance. The battery has the characteristics of high energy density, excellent continuous and rapid charge and discharge performance, long cycle life, high power density, wide operating temperature range, and environmental friendliness. Supercapacitors have broad application prospects in many fields, such as mobile communications, information technology, aerospace, national defense technology, civilian fields or used alone to adjust electric loads, store electricity, or with fuel cells, solar cells, wind power, ...

Claims

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Application Information

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IPC IPC(8): C01B31/10H01G11/24H01G11/44C01B32/336
CPCY02E60/13
Inventor 徐军红陈和平万艳玲陈玉陈勇
Owner LUOYANG YUEXING NEW ENERGY TECH
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