Preparation method of activated carbon for making supercapacitors

A supercapacitor and activated carbon technology, which is applied in the field of preparation based on the production of activated carbon for supercapacitors, can solve problems such as product performance limitations, difficult control of pore structure, and easy corrosion of equipment

Inactive Publication Date: 2015-05-27
FANGDA CARBON NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, there are also disadvantages such as high cost of activator, easy corrosion of equipment, and difficult control of pore structure, which limit its product performance in industrial production, and further research is needed to solve it.

Method used

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  • Preparation method of activated carbon for making supercapacitors

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method based on activated carbon for making supercapacitors, using precalcined petroleum coke (sulfur content 0.42%, ash content 0.12%, volatile matter 11.15%, moisture 0.08%, carbon content 88.65%) and potassium hydroxide as raw materials, followed by It includes the following steps:

[0018] Step a, pulverizing the pre-calcined petroleum coke, and sieving to obtain 200 mesh pre-calcined petroleum coke powder;

[0019] Step b, uniformly mixing the precalcined petroleum coke powder and potassium hydroxide according to a carbon-alkali mass ratio of 2.5:1 to obtain a raw material;

[0020] In step c, a mixed solvent of ethanol and water is added to the raw materials in step b, and the vacuum immersion treatment is performed for 2 hours. The volume ratio of ethanol and water is 1:0.5, and the mass ratio of raw materials to mixed solvent is 1:1.5. Evaporate the mixed solvent in the material to dryness and place it in a pre-activation furnace. At a temperature...

Embodiment 2

[0023] A preparation method based on activated carbon for making supercapacitors, using precalcined petroleum coke (sulfur content 0.42%, ash content 0.12%, volatile matter 11.15%, moisture 0.08%, carbon content 88.65%) and potassium hydroxide as raw materials, followed by It includes the following steps:

[0024] Step a, pulverizing the pre-calcined petroleum coke raw material, and sieving to obtain 300 mesh pre-calcined petroleum coke powder;

[0025] Step b, uniformly mixing the precalcined petroleum coke powder and potassium hydroxide according to the alkali carbon mass ratio of 3:1 to obtain raw materials;

[0026] In step c, a mixed solvent of ethanol and water is added to the raw material in step b, and the vacuum immersion treatment is carried out for 5 hours. The volume ratio of ethanol and water is 1:2, and the mass ratio of raw material and mixed solvent is 1:1. Evaporate the mixed solvent in the material to dryness and place it in a pre-activation furnace. At a te...

Embodiment 3

[0029] A preparation method based on activated carbon for making supercapacitors, using precalcined petroleum coke (sulfur content 0.42%, ash content 0.12%, volatile matter 11.15%, moisture 0.08%, carbon content 88.65%) and potassium hydroxide as raw materials, followed by It includes the following steps:

[0030] Step a, pulverizing the pre-calcined petroleum coke raw material, grinding to obtain 300 mesh pre-calcined petroleum coke powder;

[0031] Step b, uniformly mixing the pre-calcined petroleum coke powder and potassium hydroxide according to the alkali carbon mass ratio of 3.5:1 to obtain raw materials;

[0032] In step c, a mixed solvent of ethanol and water is added to the raw materials in step b, and the vacuum immersion treatment is performed for 2 hours. The volume ratio of ethanol and water is 1:1, and the mass ratio of raw materials to mixed solvent is 1:1.5. Evaporate the mixed solvent in the material to dryness and place it in a pre-activation furnace. At a t...

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Abstract

The invention relates to a preparation method of activated carbon for making supercapacitors, which comprises the following steps: by using pre-calcination petroleum coke and potassium hydroxide as raw materials, pulverizing, screening, carrying out impregnating pretreatment on the raw material, mechanically stirring, activating at high temperature, washing with water, washing with acid, and drying. The raw materials are subjected to pulverization, screening, impregnating pretreatment, mechanical stirring pre-activation, high-temperature activation and the like, so that the activation technique for preparing activated carbon from petroleum coke is effectively controlled. The ethanol-water mixed solvent impregnation technique is adopted to lower the carbon/alkali ratio to 3.5, thereby lowering the apparatus corrosion. The prepared activated carbon has centralized micropore distribution, the mesopore rate is controlled at 20-30%, and the pore size is centralized at 2nm or so, thereby being beneficial to the intercalation of the electrolyte in the pore canals. The pore structure of the product is effectively controlled, the tap density of the product is stabilized at 0.3 g/cm<3> above, and the specific capacity of the supercapacitor prepared from the activated carbon can reach 160 F/g above.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of activated carbon in material science and electrochemistry, and in particular relates to a preparation method based on the preparation of activated carbon for supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device, its performance is between that of battery and traditional capacitor, it has the advantages of short charging time, long service life, good temperature characteristics, energy saving and environmental protection, etc. Fields such as intermittent power supplies have broad prospects. Activated carbon has become the carbon material of choice for commercial supercapacitors due to its large specific surface area, controllable pore size, abundant and low-cost raw materials, and good stability in electrochemistry. At present, the preparation methods of activated carbon for supercapacitors are mainly physical activation method, chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 齐仲辉东红蔺文武天文刘洪波张桂兰
Owner FANGDA CARBON NEW MATERIAL CO LTD
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