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A kind of biomass supercapacitor electrode material and preparation method thereof

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., to achieve high conductivity, rich carbon content and pore structure, and large output

Active Publication Date: 2022-06-14
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no research on how to prepare activated carbon from walnut green husk, and how to improve the preparation method to obtain better material properties while reducing the preparation cost

Method used

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  • A kind of biomass supercapacitor electrode material and preparation method thereof
  • A kind of biomass supercapacitor electrode material and preparation method thereof
  • A kind of biomass supercapacitor electrode material and preparation method thereof

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preparation example Construction

[0026] How to optimize the preparation method of biomass activated carbon to make it more suitable for utilizing walnut green peel to prepare activated carbon, the invention provides a preparation method, such as figure 1 shown, including the following steps:

[0027] In the first step, the fresh walnut green peel is washed with water and ethanol three times, dried in an oven, and ground into powder by a pulverizer to obtain walnut green peel powder. Put the green skin powder in a porcelain boat and place it in a tube-type temperature-controlled furnace for pre-carbonization.

[0028] Specifically, an inert atmosphere is maintained in the tube-type temperature-controlled furnace, the temperature rise rate is 3-10°C / min at normal temperature, the temperature is raised to 100-500°C, and the temperature is kept for 1-4 hours.

[0029] Preferably, the pre-carbonization temperature is 300-500°C.

[0030] The second step is to dissolve the pre-carbonized walnut green skin toner in...

Embodiment 1

[0042] The green peel obtained from walnut peeling is washed with water and ethanol and then ground into powder. Weigh 3 mg green bark powder and place it in a covered porcelain boat, and put it into a tube-type temperature-controlled furnace. Under a steady nitrogen gas flow, set the heating rate of the tubular temperature-controlled furnace at 5°C / min to 500°C and keep it warm for two hours. Natural cooling to obtain pre-carbonized powder.

[0043] Take 0.5mg of pre-carbonized powder and add a certain amount of 3M potassium hydroxide (KOH) solution to make the mass ratio of alkali and carbon reach 4:1. After overnight stirring at a rotational speed of 1200r / min, it was dried in an oven at 80°C.

[0044]Grind the dried alkali carbon powder with a grinding bowl, put 2.5 mg into a porcelain boat, and put it into a tube-type temperature-controlled furnace. Under a steady nitrogen gas flow, set the heating rate of the tubular temperature-controlled furnace at 5°C / min to 600°C,...

Embodiment 2

[0052] The green peel obtained from walnut peeling is washed with water and ethanol and then ground into powder. Weigh 3 mg green bark powder and place it in a covered porcelain boat, and put it into a tube-type temperature-controlled furnace. Under a steady nitrogen gas flow, set the heating rate of the tubular temperature-controlled furnace at 5°C / min to 500°C and keep it warm for two hours. Natural cooling to obtain pre-carbonized powder.

[0053] Take 0.5mg of pre-carbonized powder and add a certain amount of 3M potassium hydroxide (KOH) solution to make the mass ratio of alkali and carbon reach 3:1. After overnight stirring at a rotational speed of 1200r / min, it was dried in an oven at 80°C.

[0054] Grind the dried alkali carbon powder with a grinding bowl, put 2.5 mg into a porcelain boat, and put it into a tube-type temperature-controlled furnace. Under a steady nitrogen gas flow, set the heating rate of the tubular temperature-controlled furnace at 5°C / min to 600°C...

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Abstract

The invention relates to the field of capacitor electrode materials, in particular to a biomass supercapacitor electrode material and a preparation method thereof. The biomass supercapacitor electrode material is biomass activated carbon made of walnut green peel. The preparation method mainly includes the following steps: drying and grinding the washed walnut green peel into powder, and calcining for pre-carbonization; adding the carbon powder into a strong alkali aqueous solution and stirring After drying; calcining the alkali-containing carbon powder to obtain walnut green peel activated carbon with different activation temperatures; dissolving and dispersing the activated carbon, acetylene black, and PVDF, and coating it on the substrate to obtain a working electrode. The prepared supercapacitor electrode material walnut green husk activated carbon has a uniformly distributed pore structure and a high surface area, and can improve the conduction and mass transfer capacity of the supercapacitor electrode.

Description

technical field [0001] The invention relates to the field of capacitor electrode materials, in particular to a biomass supercapacitor electrode material and a preparation method thereof. Background technique [0002] With the increase of global population and the rapid development of industry, traditional fossil energy is becoming exhausted. While exploring new clean energy sources, countries are also researching devices that can store energy more efficiently. Supercapacitors have broad application prospects in the field of energy storage due to their high energy density, power density, wide operating temperature and long life. However, the performance of supercapacitors largely depends on the electrode materials. [0003] At present, the electrode materials of supercapacitors mainly include carbon materials, metal oxide materials and conductive polymer materials. Among them, the carbon material itself has the characteristics of porous, good electrical conductivity, and l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/44H01G11/34H01G11/86
CPCH01G11/24H01G11/44H01G11/34H01G11/86Y02E60/13
Inventor 刘煊赫田娜
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)