A kind of activated carbon material, preparation method and supercapacitor

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 specifically relates to an activated carbon material, a preparation method and a super capacitor. Background technique [0002] Supercapacitor is an energy storage element based on the electrochemical process of the electrode / electrolyte interface between the battery and the traditional capacitor. Its capacity comes from the electric double layer capacitance and the Faraday quasi-capacitance. It has both the high power density and power density of ordinary capacitors. 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, defense technology, civilian fields or used alone to adjust electr...

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.

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