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A preparation method based on carbonized melamine foam@Bi2O3 nanosheet supercapacitor electrode material

A carbonized melamine and supercapacitor technology, which is applied in hybrid capacitor electrodes, carbon preparation/purification, chemical instruments and methods, etc., can solve the problems of low redox reversibility, poor cycle stability, low capacitance, etc., and shorten the diffusion path , good electrical conductivity, high specific surface area

Active Publication Date: 2021-04-16
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbon materials usually have relatively low capacitance. In the prior art, heteroatoms are often doped to improve capacitance, such as patent CN201810212762.6, but their electrochemical stability, redox reversibility, and cycle stability are poor.

Method used

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  • A preparation method based on carbonized melamine foam@Bi2O3 nanosheet supercapacitor electrode material
  • A preparation method based on carbonized melamine foam@Bi2O3 nanosheet supercapacitor electrode material
  • A preparation method based on carbonized melamine foam@Bi2O3 nanosheet supercapacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) The melamine foam sample (13.0×2.5×2.5 cm 3 ) on a quartz boat and placed in a tube furnace. Before pyrolysis, the sample was passed through argon gas at room temperature for 10-30 min, and the flow rate of argon gas was 1000 standard cubic centimeters per minute, and the air inside was exhausted. The melamine foam was pyrolyzed at 600-800 °C for 1-2 h, and the heating rate was 5-10 °C / min to reach the highest temperature. After pyrolysis, the sample temperature slowly returned to room temperature. The entire heating and cooling process is carried out under continuous argon at 500-1000 sccm / min.

[0029] (2) Weigh 0.97 g of bismuth nitrate pentahydrate and dissolve it in the mixture of ethanol and ethylene glycol, stir and dissolve to obtain a dispersion.

[0030] (3) Cut a small piece of the carbonized melamine foam obtained in step (1) into a polytetrafluoroethylene hydrothermal reaction kettle, and pour the uniform dispersion obtained in step (2) into it for hy...

Embodiment 2

[0034] (1) The melamine foam sample (13.0×2.5×2.5 cm 3) on a quartz boat and placed in a tube furnace. Before pyrolysis, the sample was passed through argon gas at room temperature for 10-30 min, and the flow rate of argon gas was 1000 standard cubic centimeters per minute, and the air inside was exhausted. The melamine foam was pyrolyzed at 600-800 °C for 1-2 h, and the heating rate was 5-10 °C / min to reach the highest temperature. After pyrolysis, the sample temperature rose slowly to 25-40 °C. The entire heating and cooling process is carried out under continuous argon at 500-1000 sccm / min.

[0035] (2) Weigh 1.455 g bismuth nitrate pentahydrate and dissolve it in the mixture of ethanol and ethylene glycol, stir and dissolve to obtain a dispersion.

[0036] (3) Cut a small piece of the carbonized melamine foam obtained in step (1) into a polytetrafluoroethylene hydrothermal reaction kettle, and pour the uniform dispersion obtained in step (2) into it for hydrothermal reac...

Embodiment 3

[0040] (1) The melamine foam sample (13.0×2.5×2.5 cm 3 ) on a quartz boat and placed in a tube furnace. Before pyrolysis, the sample was passed through argon gas at room temperature for 10-30 min, and the flow rate of argon gas was 1000 standard cubic centimeters per minute, and the air inside was exhausted. The melamine foam was pyrolyzed at 600-800 °C for 1-2 h, and the heating rate was 5-10 °C / min to reach the highest temperature. After pyrolysis, the sample temperature rose slowly to 25-40 °C. The entire heating and cooling process is carried out under continuous argon at 500-1000 sccm / min.

[0041] (2) Weigh 1.94 g of bismuth nitrate pentahydrate and dissolve it in the mixture of ethanol and ethylene glycol, stir and dissolve to obtain a dispersion.

[0042] (3) Cut a small piece of the carbonized melamine foam obtained in step (1) into a polytetrafluoroethylene hydrothermal reaction kettle, and pour the uniform dispersion obtained in step (2) into it for hydrothermal r...

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Abstract

A carbonized melamine-based foam@Bi disclosed by the present invention 2 o 3 The preparation method of nanosheet supercapacitor electrode material comprises the following steps: (1) performing hydrothermal reaction on water-soluble bismuth salt and carbonized melamine foam; (2) cleaning agent to remove residual solvent and Bi 3+ , NO 3 ‑ , to obtain an intermediate product; (3) under an inert atmosphere, anneal the intermediate product to obtain carbonized melamine foam@Bi 2 o 3 Nanosheet supercapacitor electrode material, the present invention grows Bi in situ on carbonized melamine foam by a simple solvothermal method 2 o 3 Nanosheets form a three-dimensional core-sheath structure. The electrode material has good conductivity and high specific surface area, which is conducive to the storage of electrolytes, shortens the diffusion path of electrolyte ions, and increases the contact area between electrolytes and materials, thereby improving capacitance. The use of binders and conductive additives is avoided when constructing capacitors, and the prepared materials can be made into flexible electrodes, and the preparation method is simple, environmentally friendly and low in cost.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a carbonized melamine-based foam @ Bi 2 o 3 A preparation method of a nanosheet supercapacitor electrode material. Background technique [0002] With the rapid development of modern technology, new concept electronic products such as highly integrated, lightweight, portable, wearable, and implantable are emerging. With the advent of smart electronic products, there is an urgent need to develop highly compatible micro-nano energy storage devices to solve power problems. As an emerging energy storage device, supercapacitors have attracted much attention due to their ability to bridge the gap between batteries and conventional capacitors. To meet the huge demands of practical applications, it is imperative to develop a supercapacitor with high energy density and high operating voltage while maintaining high power density and long cycle life. Supercapacitors are mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/34H01G11/46H01G11/48H01G11/86C01G29/00C01B32/05B82Y30/00B82Y40/00
CPCY02E60/13
Inventor 孙义民易荣华周爱军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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