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Production method of high-specific-capacitance activated carbon electrode material for super capacitor

A technology for supercapacitors and production methods, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problem of difficulty in ensuring the structural stability of electrode materials than capacitors, and achieve the effects of high specific capacitance, reduced investment, and stable cyclic charge-discharge performance.

Inactive Publication Date: 2011-10-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since there is no further activation treatment, it is difficult to guarantee the specific capacitance and structural stability of the electrode material.

Method used

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  • Production method of high-specific-capacitance activated carbon electrode material for super capacitor
  • Production method of high-specific-capacitance activated carbon electrode material for super capacitor

Examples

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Effect test

Embodiment 1

[0027] Commercially available anthracite-based granular activated carbon was pulverized and ground, passed through a 40-mesh sieve, and then wet ball milled for 8 hours. The obtained powder was placed in a tube furnace and heat-treated at 400 °C for 4 hours in an air atmosphere. Cool down to room temperature and pass through a 200-mesh sieve, then mix and grind with potassium hydroxide at a weight ratio of 1:4, place in a tube furnace and treat at 400°C for 1h under the protection of high-purity nitrogen, and then raise the temperature to 700°C for 2h. Naturally cool to room temperature under the protection of an inert atmosphere, wash with dilute hydrochloric acid and deionized water in sequence until the solution becomes neutral, filter with suction, and dry in vacuum to obtain activated carbon for supercapacitors. The measured specific surface area of ​​the material is 2774m 2 / g, the average specific capacitance is 227F / g. Typical capacitance test cyclic voltammetry curve...

Embodiment 2

[0029] Commercially available pitch-based spherical activated carbon was pulverized and ground, passed through a 30-mesh sieve, and then wet-milled for 8 hours. The obtained powder was placed in a tube furnace and heat-treated at 300°C for 3 hours in an air atmosphere. Cool down to room temperature and pass through a 250-mesh sieve, then mix and grind with potassium hydroxide at a weight ratio of 1:5, place in a tube furnace and treat at 400°C for 2h under the protection of high-purity nitrogen, and then raise the temperature to 800°C for 2h. Naturally cool to room temperature under the protection of an inert atmosphere, wash with dilute hydrochloric acid and deionized water in sequence until the solution becomes neutral, filter with suction, and dry in vacuum to obtain activated carbon for supercapacitors. The measured specific surface area of ​​the material is 2470m 2 / g, the average specific capacitance is 214F / g.

Embodiment 3

[0031] Commercially available husk-based granular activated carbon was crushed and ground, passed through a 60-mesh sieve, and then ball-milled for 8 hours. The resulting powder was placed in a tube furnace and heat-treated at 350°C for 3 hours in an air atmosphere. Cool down to room temperature and pass through a 200-mesh sieve, then mix and grind with potassium hydroxide at a weight ratio of 1:4, place in a tube furnace and treat at 400°C for 2h under the protection of high-purity nitrogen, and then raise the temperature to 850°C for 3h. Naturally cool to room temperature under the protection of an inert atmosphere, wash with dilute hydrochloric acid and deionized water in sequence until the solution becomes neutral, filter with suction, and dry in vacuum to obtain activated carbon for supercapacitors. The measured specific surface area of ​​the material is 2188m 2 / g, the average specific capacitance is 200F / g.

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Abstract

The invention discloses a production method of a high-specific-capacitance activated carbon electrode material for a super capacitor. The method comprises the following steps: smashing the granular activated carbon obtained from various material (coal, petroleum, wood, husk and other carbon sources), ball-milling, sieving, and processing for 2.5-4.0 hours at 300-500 DEG C in the air atmosphere, thus obtaining a powder A; fully mixing the powder A with the potassium hydroxide at a mass ratio of 1:(2.5-5.0), and processing for 1.0-3.0 hours at 400-500 DEG in a flowing inertia atmosphere, thus obtaining a powder B; further processing the powder B for 2.0-5.0 hours at 700-900 DEG C in the flowing inertia atmosphere, thus obtaining an active powder C; cooling the power C to the room temperature under the protection of an inertial atmosphere; washing the solution by sequentially using diluted acid and water until the solution is neutral; and filtering and vacuum drying, thus obtaining the high-specific-capacitance activated carbon electrode material. The electrode material prepared through the method has the advantages of high specific capacitance and ideal circulation charge and discharge properties; and the method provided by the invention is simple and suitable for use and can be used for obviously increasing the commercial added value of the activated carbon.

Description

technical field [0001] The invention relates to a method for preparing activated carbon for high specific capacitance supercapacitors, and belongs to the technical field of new energy and new materials where supercapacitors and carbon electrode materials are located. Background technique [0002] Activated carbon has a rich pore structure and exhibits superior adsorption properties, so it has a wide range of applications as an adsorbent in water treatment, air purification, decolorization, separation, solvent recovery and other fields. Activated carbon can be roughly divided into two categories according to the source of raw materials: wood-based activated carbon (mainly based on wood, fruit shells, bamboo and other agricultural and sideline products containing lignocellulose) and mineral-based activated carbon (mainly based on petroleum coke, pitch, tar and coal and its by-products as raw materials). Due to the rich sources of raw materials, the annual output of activated ...

Claims

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Application Information

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IPC IPC(8): H01G9/042
Inventor 刘洪涛朱晨张远亮
Owner CENT SOUTH UNIV
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