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3D network pore structure super-capacitor carbon and preparation method thereof

A supercapacitor and pore structure technology, applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve the problems of high cost, short service life, slow charging and discharging speed of supercapacitors, etc., achieve small internal resistance, improve The effect of charging and discharging speed

Active Publication Date: 2016-06-08
贵州森环活性炭有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems existing in the existing preparation technology that the capacitive carbon pores are not connected to each other, and the resistance of the electrolyte to enter and exit is large, resulting in slow charging and discharging speed of the supercapacitor, rapid capacitance decay, short service life and high cost, the present invention provides a 3D network Porous structure supercapacitor carbon and its preparation method, the product has high capacitance performance, fast charge and discharge speed, slow attenuation, and long cycle life

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  • 3D network pore structure super-capacitor carbon and preparation method thereof
  • 3D network pore structure super-capacitor carbon and preparation method thereof
  • 3D network pore structure super-capacitor carbon and preparation method thereof

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preparation example Construction

[0040] A preparation method of supercapacitor carbon with 3D network pore structure, using a new comprehensive activation method, first using ZnCl 2 Activation prepares well-developed medium and large pores, and then KOH is used to create abundant micropores in the medium and large pores, and the pores are connected; finally, it is refined with high-temperature steam to open the closed pores and remove the residual carbon particles in the pores. Obtain a 3D network pore structure interconnected inside, significantly reduce the resistance of electrolyte ions in and out, increase the charge and discharge speed, and reduce the capacitance decay rate. Specifically include the following steps:

[0041] The first step, raw material preparation: wash coconut shells, walnut shells, wood chips, bamboo chips, and straw with hydrochloric acid in stages to remove inorganic impurities, and after drying, crush them to less than 2mm;

[0042] The second step, ZnCl 2 Activation: configure z...

Embodiment 1

[0048] (1) Raw material preparation: the coconut shell is washed with 0.1mol / L hydrochloric acid in stages to remove inorganic impurities, and after drying, it is broken to less than 2mm;

[0049] (2) ZnCl 2 Activation: Zinc chloride is configured into an aqueous solution with a mass concentration of 60%. According to the mass ratio of 1:1, the coconut shell and the zinc chloride aqueous solution are mixed, placed in a closed high-pressure container, and immersed in a gas pressure of 0.5Mpa for 24 hours. After drying at 150°C, place the mixture in an activation furnace and activate at 600°C for 1 hour. After cooling, wash with deionized water to recover ZnCl 2 , to obtain activated carbon (AC-Zn) with rich medium and large pores;

[0050] (3) KOH activation: According to the mass ratio of 1:1, AC-Zn and KOH powder were mixed and placed in a stainless steel tank. 2 Heating pretreatment under protection for 1h, heating temperature 600°C; activation reaction at 900°C for 1h, af...

Embodiment 2

[0054] (1) Raw material preparation: the coconut shell is washed with 0.1mol / L hydrochloric acid in stages to remove inorganic impurities, and after drying, it is broken to less than 2mm;

[0055] (2) ZnCl 2 Activation: Zinc chloride is configured into an aqueous solution with a mass concentration of 60%. According to the mass ratio of 1:1, the coconut shell and the zinc chloride aqueous solution are mixed, placed in a closed high-pressure container, and immersed in a gas pressure of 0.5Mpa for 24 hours. After drying at 150°C, place the mixture in an activation furnace and activate at 600°C for 1 hour. After cooling, wash with deionized water to recover ZnCl 2 , to obtain activated carbon (AC-Zn) with rich medium and large pores;

[0056] (3) KOH activation: According to the mass ratio of 1:1, AC-Zn and KOH powder were mixed and placed in a stainless steel tank. 2 Heating pretreatment under protection for 1h, heating temperature 600°C; activation reaction at 900°C for 1h, af...

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Abstract

The invention provides a 3D network pore structure super-capacitor carbon and a preparation method thereof. The preparation method comprises the following steps of: mixing a wooden raw material with ZnCl2, activating, washing, and recycling ZnCl2 so as to obtain AC-Zn; then mixing AC-Zn with KOH, activating, washing, recycling KOH, and etching well-developed micropores in mesopores and macropores so as to obtain AC-Zn-K; finally performing refining treatment on AC-Zn-K by use of high-temperature water vapor, opening pores with openings sealed by wood tar carbon residue particles, and eliminating organic carbon particle residues in pore canals of activated carbon, so as to obtain 3D network structure activated carbon with mutually communicated internal pores. The activated carbon prepared by the method has the advantages that the internal pores are mutually communicated, so that the internal resistance is less, and electrolyte ions can get in and out of the pores freely; during charging, an electrolyte rapidly enters into the pores of the activated carbon so as to form a double electrode layer; during discharging, the electrolyte ions are completely evacuated, and the pore canals are clean, so that the charging and discharging speeds of a capacitor are obviously improved.

Description

technical field [0001] The invention relates to a 3D network pore structure supercapacitor carbon and a preparation method thereof, in particular to a method for preparing a 3D network pore structure supercapacitor carbon with interconnected internal pores through zinc chloride-potassium hydroxide-water vapor combined activation of biomass raw materials. Background technique [0002] Supercapacitors have the characteristics of fast charging speed, high power density, and long life. They are the most effective way to solve the power supply for electric vehicles. It can be used not only as the sole power source for electric vehicles, but also as an auxiliary power source for electric vehicles. Supercapacitors can also be used for power devices such as photovoltaic battery storage, grid stabilization, and radio transmission, as well as starting energy for tanks and rocket traction; the United States, Europe, Japan, etc. are also conducting research on supercapacitors. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B31/10H01G11/34C01B32/336
CPCC01P2006/12C01P2006/40H01G11/34Y02E60/13
Inventor 孙康蒋剑春冷昌宇邓先伦卢辛成陈超朱光真贾羽洁
Owner 贵州森环活性炭有限公司
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