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A kind of preparation method of porous activated carbon/copper ion supercapacitor

A technology of porous activated carbon and supercapacitor, which is used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc. Refugee use and other issues, to achieve the effect of strong cycle stability, environmentally friendly preparation process, and low cost

Inactive Publication Date: 2018-04-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to different electrode materials, supercapacitors can be divided into: carbon-based, conductive polymer-based, metal oxide-based and their mixed material supercapacitors; metal oxide-based supercapacitors generally have poor conductivity, are limited by resources, and are difficult to be widely used. Civilian applications and other issues; conductive polymer-based supercapacitors have not entered commercial use due to their cycle stability; carbon-based supercapacitors are environmentally friendly, low-cost, rich in resources, long service life, and good conductivity. However, the energy density of carbon-based supercapacitors is still at a low level, and countries all over the world are working hard to develop carbon-based supercapacitors with high energy and high power density.
[0004] According to its structure, it can be divided into symmetric and asymmetric hybrid supercapacitors. The asymmetric supercapacitor can improve the voltage window and energy density to a certain extent; however, this cannot fundamentally solve the problem of supercapacitors. Problems with electrode materials
[0005] According to the different electrolyte systems, it can be divided into aqueous electrolyte, organic solvent electrolyte and ionic liquid electrolyte supercapacitor. The non-aqueous electrolyte system effectively increases the voltage window of the supercapacitor; however, its conductivity, power density and safety restricted

Method used

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  • A kind of preparation method of porous activated carbon/copper ion supercapacitor
  • A kind of preparation method of porous activated carbon/copper ion supercapacitor
  • A kind of preparation method of porous activated carbon/copper ion supercapacitor

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Effect test

Embodiment 1

[0050] (1) The wet bean curd residue was dried with hot air at 100° C. for 24 hours, then pulverized, and then sieved through 100 meshes to obtain the undersize.

[0051] (2) Use hydrochloric acid with a concentration of 1.0mol / L, a liquid / solid ratio of 8, a temperature of 50°C, and a stirring time of 4 hours to acidify the raw material obtained in step (1), then wash and filter with deionized water to pH The value is neutral, and the treated sample is dried to a constant weight in a vacuum oven at a temperature of 100°C.

[0052] (3) adding distilled water to the raw material obtained in step (2) is made into a mixture with a liquid / solid ratio of 6, and this mixture is transferred to a high-pressure hydrothermal reactor whose inner liner is polytetrafluoroethylene. After hydrothermal treatment at 200°C for 12 hours, cool to room temperature, wash and filter the hydrothermal product to neutrality, and then vacuum-dry at 100°C to constant weight to obtain hydrothermal char. ...

Embodiment 2

[0064] (1) The peanut oil residue was dried with hot air at 100° C. for 24 hours, then pulverized, and then sieved through 80 meshes to obtain the undersize.

[0065] (2) Using NaOH solution with a concentration of 0.5mol / L, a liquid / solid ratio of 6, a temperature of 40°C, and a stirring time of 5h, the raw material obtained in step (1) is subjected to alkali treatment, and then washed with deionized water and suction filtered to The pH value is neutral, and the treated sample is dried to a constant weight in a vacuum oven at a temperature of 110°C.

[0066] (3) adding distilled water to the raw material obtained in step (2) is made into a mixture with a liquid / solid ratio of 8, and this mixture is transferred to a high-pressure hydrothermal reactor whose inner liner is polytetrafluoroethylene. After hydrothermal treatment at 210°C for 12 hours, cool to room temperature, wash and filter the hydrothermal product to neutrality, and then vacuum-dry at 100°C to constant weight to...

Embodiment 3

[0078] (1) The sunflower oil residue was dried with hot air at 100° C. for 48 hours, then pulverized, and then sieved through 120 meshes to obtain the undersize.

[0079] (2) Use hydrochloric acid with a concentration of 2.0mol / L, a liquid / solid ratio of 7, a temperature of 55°C, and a stirring time of 5 hours to acidify the raw material obtained in step (1), and then wash and filter with deionized water to pH The value is neutral, and the treated sample is dried to a constant weight in a vacuum oven at a temperature of 100°C.

[0080] (3) adding distilled water to the raw material obtained in step (2) is made into a mixture with a liquid / solid ratio of 7, and this mixture is transferred to a high-pressure hydrothermal reactor whose inner liner is polytetrafluoroethylene. After hydrothermal treatment at 180°C for 36 hours, cool to room temperature, wash and filter the hydrothermal product to neutrality, and then vacuum-dry at 100°C to constant weight to obtain hydrothermal cha...

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Abstract

The invention discloses a preparation method of porous activated carbon / copper ion supercapacitor. In the invention, the residue after processing of edible plant fruit is used as a carbon source, and a porous activated carbon supercapacitor electrode material is prepared by hydrothermal treatment, carbonization and two-stage activation technology; a non-copper-containing substance is introduced into the copper ion aqueous solution to form a redox electrolyte of the supercapacitor. The supercapacitor of the present invention is provided by the porous activated carbon to provide the electric double layer capacitance and the reversible redox reaction of copper ions to provide the Faradaic capacitance, so as to realize the synergistic superposition of the two capacitances. The constructed porous activated carbon / copper ion supercapacitor has a specific capacitance of 492 F / g at a current density of 1 A / g and a specific capacitance of 285 F / g at a current density of 20 A / g, with low internal resistance and good cycle stability. , long life, high power and high energy density characteristics, and low cost, abundant resources, environmental friendliness, easy industrialization and so on.

Description

technical field [0001] The invention relates to the field of electrochemical new energy, in particular to a method for preparing a porous activated carbon / copper ion supercapacitor with excellent electrochemical performance. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device between batteries and traditional electrostatic capacitors. Compared with traditional electrostatic capacitors, supercapacitors have higher energy density and specific capacitance; compared with batteries , supercapacitors have greater power density, high charge and discharge efficiency, maintenance-free, long cycle life and other excellent characteristics. Therefore, it has a wide range of applications in energy, power electronics, communications, national defense and other fields. [0003] According to different electrode materials, supercapacitors can be divided into: carbon-based, conductive polymer-based, metal oxide-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/84H01G11/86H01G11/44H01G11/62
CPCY02E60/13
Inventor 刘恩辉滕远刘琨刘瑞花丁锐
Owner XIANGTAN UNIV
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