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Method for efficiently removing chemical groups from surface of supercapacitor carbon and supercapacitor carbon

A surface chemical and capacitive carbon technology, applied in the field of surface chemical group elimination, can solve the problems of unstable electrochemical performance, fast capacitance decay, short service life, etc., and achieve easy scale promotion, low capacitance decay, simple method effect

Inactive Publication Date: 2016-02-10
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Technical problem to be solved: In order to solve the problems of unstable electrochemical performance, fast capacitance decay and short service life caused by too many chemical groups on the surface of supercapacitor carbon, the present invention provides a method for efficiently removing chemical groups on the surface of supercapacitor carbon. The process is simple, the removal efficiency of chemical groups is high, the energy consumption is low, and it is easy to promote

Method used

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  • Method for efficiently removing chemical groups from surface of supercapacitor carbon and supercapacitor carbon
  • Method for efficiently removing chemical groups from surface of supercapacitor carbon and supercapacitor carbon
  • Method for efficiently removing chemical groups from surface of supercapacitor carbon and supercapacitor carbon

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Effect test

Embodiment 1

[0029] The first step is to weigh a certain amount of supercapacitor carbon powder, the particle diameter is less than 15 microns, and it is miscible in distilled water. The mass ratio of carbon to water is kept at 1:20, and placed in a constant temperature magnetic stirrer with a stirring speed of 2000r / min. Keep the charcoal powder fully suspended.

[0030] In the second step, according to the mass ratio of carbon to hydrazine hydrate of 1:0.5, add hydrazine hydrate dropwise to the suspension, keep the temperature of the water bath at 60°C, react for 30 minutes, and keep magnetic stirring to suspend the carbon powder. After the reaction, the carbon powder was filtered, and the carbon powder was rinsed with distilled water for 3 times. The filtered sample was placed in an oven at 105°C and taken out after 3 hours to obtain a supercapacitor carbon with surface functional groups eliminated. The supercapacitor carbon has 3000 charge and discharge cycles, the capacitance decay ra...

Embodiment 2

[0032] The first step is to weigh a certain amount of supercapacitor carbon powder, the particle diameter is less than 15 microns, and it is miscible in distilled water. The mass ratio of carbon to water is kept at 1:20, and placed in a constant temperature magnetic stirrer with a stirring speed of 2000r / min. Keep the charcoal powder fully suspended.

[0033] In the second step, according to the mass ratio of carbon to hydrazine hydrate of 1:1.0, add hydrazine hydrate dropwise to the suspension, keep the temperature of the water bath at 80°C, react for 60 minutes, and keep magnetic stirring to suspend the carbon powder. After the reaction, the carbon powder was filtered, and the carbon powder was rinsed with distilled water for 3 times. The filtered sample was placed in an oven at 105°C and taken out after 3 hours to obtain a supercapacitor carbon with surface functional groups eliminated. The supercapacitor carbon was prepared for 3000 charge and discharge cycles, the capacit...

Embodiment 3

[0035] The first step is to weigh a certain amount of supercapacitor carbon powder, the particle diameter is less than 15 microns, and it is miscible in distilled water. The mass ratio of carbon to water is kept at 1:20, and placed in a constant temperature magnetic stirrer with a stirring speed of 2000r / min. Keep the charcoal powder fully suspended.

[0036] In the second step, according to the mass ratio of carbon to hydrazine hydrate of 1:2.0, add hydrazine hydrate dropwise to the suspension, keep the temperature of the water bath at 90°C, react for 90 minutes, and keep magnetic stirring to suspend the carbon powder. After the reaction, the carbon powder was filtered, and the carbon powder was rinsed with distilled water for 3 times. The filtered sample was placed in an oven at 105°C and taken out after 3 hours to obtain a supercapacitor carbon with surface functional groups eliminated. It is characterized in that the prepared supercapacitor carbon has 3000 charging and dis...

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Abstract

A method for efficiently removing chemical groups from surface of supercapacitor carbon and the supercapacitor carbon are disclosed. The method comprises the steps of weighing a certain weight of supercapacitor carbon powder, mixing and dissolving the supercapacitor carbon powder into distilled water at the mass ratio of carbon to water of 1: 20; magnetically stirring at the constant temperature to enable the carbon powder to be fully suspended; adding hydrazine hydrate drop by drop to the suspension liquid based on the mass ratio of carbon to hydrazine hydrate of 1:0.5-1:3.0; keeping the water bath temperature of 60-100 DEG C, and reacting for 30-120 minutes, after reaction, filtering, washing the carbon layer for three times by distilled water, putting the sample after being filtered in an oven at the temperature of 105 DEG C and taking the product out three hours later to obtain the supercapacitor carbon, wherein the surface functional groups of the supercapacitor carbon are eliminated. The supercapacitor carbon product is stable in chemical property, low in capacity fading and long in cycle service life.

Description

technical field [0001] The invention relates to a method for efficiently removing surface chemical groups of supercapacitor carbon, in particular to a method for eliminating surface chemical groups of organic supercapacitor carbon. Background technique [0002] At present, the preparation method of activated carbon with high specific surface area for supercapacitor electrodes usually adopts KOH activation method and metal-catalyzed high-temperature steam activation method. The reaction is carried out under an oxygen atmosphere, which leads to a large number of oxygen-containing functional groups on the surface of activated carbon. These chemical groups will undergo irreversible side reactions such as oxygen evolution and hydrogen evolution during the charging and discharging process of the electrode, resulting in rapid capacitance decay and low cycle times of the capacitor. This is the key reason why supercapacitors are expensive and have a short service life at present. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/32
CPCY02E60/13H01G11/86H01G11/32
Inventor 孙康蒋剑春邓先伦冷昌宇陈超卢辛成朱光真贾羽洁
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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