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Activated carbon for supercapacitor and preparation method and application of activated carbon

A supercapacitor and activated carbon technology, which is applied in the manufacture of hybrid/electric double layer capacitors, chemical instruments and methods, hybrid capacitor electrodes, etc., can solve the problems of low specific capacitance, high cost, and equipment corrosion of activated carbon, and achieve pore structure Developed, reasonable pore size distribution, and the effect of improving specific capacitance

Inactive Publication Date: 2018-11-06
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Activated carbon currently used as electrode material for supercapacitors is mainly prepared by activation of alkali metal compounds, which can prepare activated carbon with high specific surface area, so that supercapacitors can have higher specific capacitance and energy density; but activation of alkali metal compounds It is very corrosive to the equipment, the cost is high, the environment is polluted seriously, and there are serious safety production problems, so the alkali metal compound activation method is not suitable for large-scale production; the activation process of the steam activation method or carbon dioxide activation method is simple , low cost and clean and pollution-free, suitable for large-scale industrial applications, but the specific capacitance of activated carbon obtained by activation is relatively low, which does not meet the standards of supercapacitor electrode materials actually required in industry

Method used

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  • Activated carbon for supercapacitor and preparation method and application of activated carbon
  • Activated carbon for supercapacitor and preparation method and application of activated carbon
  • Activated carbon for supercapacitor and preparation method and application of activated carbon

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preparation example Construction

[0028] The invention provides a kind of preparation method of activated carbon for supercapacitor, comprises the steps:

[0029] (1) Activate the carbonized material with the first gas to obtain the primary activated material; the temperature for the first gas activation is 800-950°C; the time for the first gas activation is 30-120 minutes;

[0030] (2) The primary activation material obtained in the step (1) is subjected to second gas activation, and the secondary activation material is obtained after cooling down; the temperature of the second gas activation is 800 to 1000°C, and the second gas activation The time is 30-180 minutes;

[0031] (3) the secondary activated material obtained in the step (2) is successively ground, washed and dried to obtain activated carbon for supercapacitor;

[0032] The activator for the first gas activation and the activator for the second gas activation independently include one or more of water vapor, carbon dioxide, air and ammonia, and t...

Embodiment 1

[0071] Place 300g of dried pine wood (1cm×1cm×15cm) in a carbonization furnace, heat up to 900°C at a rate of 10°C / min, and carbonize for 120min under nitrogen protection to obtain a carbonized material;

[0072] Weigh 15g of 900°C carbonized material and put it into an activation furnace for activation. During the temperature programming stage, nitrogen was introduced as a protective gas, and the heating rate was set at 10°C / min. When the actual temperature in the furnace reaches 850°C, turn off the nitrogen, and pass in water vapor at this temperature to activate for 60 minutes. After the water vapor activation is completed, turn off the water vapor, and immediately pass CO 2 gas. Then the activation furnace was heated up to 900°C at a rate of 10°C / min, activated at 900°C for 120min, CO 2 The flow rate is 0.2L / min. CO 2 After activation, cut off CO 2 The gas channel was immediately changed to nitrogen protection, and the activation furnace began to cool down naturally....

Embodiment 2～10

[0075] Examples 2-10 The preparation method of carbonized material and the activation method of carbonized material are the same as in Example 1, except that the parameters of the two gas activations are different, which are specifically listed in Table 1.

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Abstract

The invention belongs to the technical field of preparation of activated carbon materials and particularly relates to activated carbon for a supercapacitor and a preparation method and application ofactivated carbon. Different activators are used for performing gas activation on carbonized materials twice, the carbonized materials are activated into activated carbon with mesoporous and microporous structures, a large-area space is provided for charge storage, and a rapid transport channel is also provided for electrolyte ions, so that increase of the specific capacitance of the supercapacitoris facilitated. Results of the embodiment show that when activated carbon obtained by the method is used as an electrode material of the supercapacitor, a 2 mol / L of 1-ethyl-3-methylimidazolium tetrafluoroborate / acetonitrile solution is used as an electrolyte, and when the sweep rate is 5 mV / s, the specific capacitance of the supercapacitor reaches 110-186 F / g.

Description

technical field [0001] The invention belongs to the technical field of activated carbon material preparation, and in particular relates to an activated carbon for a supercapacitor and a preparation method and application thereof. Background technique [0002] In recent years, as a new type of energy storage device, supercapacitors have been favored by people because of their fast charging and discharging speed, long cycle life, safety and pollution-free, and are widely used in electric vehicles, electronic equipment and smart grids. Supercapacitors are mainly composed of electrode materials, electrolytes, and separators. Among them, electrode materials are the key factors that determine the electrochemical energy storage performance of supercapacitors. At present, carbon materials are widely used in supercapacitor electrode materials. Commonly used carbon materials include activated carbon, carbon nanotubes, graphene, carbon aerogels, carbon fibers and carbon materials made ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/336C01B32/324H01G11/34H01G11/44H01G11/86
CPCC01B32/324C01B32/336H01G11/34H01G11/44H01G11/86Y02E60/13
Inventor 左宋林杜颜珍
Owner NANJING FORESTRY UNIV
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