Preparation method of supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets

A carbonized melamine, supercapacitor technology, 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., to shorten the diffusion path. , the effect of good conductivity and high specific surface area

Active Publication Date: 2019-06-28
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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  • Preparation method of supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets
  • Preparation method of supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets
  • Preparation method of supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets

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 samples were bubbled with argon at room temperature for 10-30 min, and the argon flow rate was 1000 standard cubic centimeters per minute, and the air inside was exhausted. The melamine foam was pyrolyzed at 600-800 ℃ for 1-2 h, and the heating rate was 5-10 ℃ / min, reaching the highest temperature. After pyrolysis, the sample temperature slowly returned to room temperature. The entire heating and cooling process was carried out under continuous argon at 500-1000 standard cubic centimeters / min.

[0029] (2) Dissolve 0.97 g of bismuth nitrate pentahydrate in a mixed solution of ethanol and ethylene glycol, stir and dissolve to obtain a dispersion.

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

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 samples were bubbled with argon at room temperature for 10-30 min, and the argon flow rate was 1000 standard cubic centimeters per minute, and the air inside was exhausted. The melamine foam was pyrolyzed at 600-800 ℃ for 1-2 h, and the heating rate was 5-10 ℃ / min, reaching the highest temperature. After pyrolysis, the sample temperature slowly rose to 25-40 ℃. The entire heating and cooling process was carried out under continuous argon at 500-1000 standard cubic centimeters / min.

[0035] (2) Dissolve 1.455 g of bismuth nitrate pentahydrate in a mixed solution of ethanol and ethylene glycol, stir and dissolve to obtain a dispersion.

[0036] (3) Cut out a small piece of the carbonized melamine foam obtained in step (1) and put it into a polytetrafluoroethylene hydrothermal reactor, and pour the uniform dispersion obtained in step (2) into it to ca...

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 samples were bubbled with argon at room temperature for 10-30 min, and the argon flow rate was 1000 standard cubic centimeters per minute, and the air inside was exhausted. The melamine foam was pyrolyzed at 600-800 ℃ for 1-2 h, and the heating rate was 5-10 ℃ / min, reaching the highest temperature. After pyrolysis, the sample temperature slowly rose to 25-40 ℃. The entire heating and cooling process was carried out under continuous argon at 500-1000 standard cubic centimeters / min.

[0041] (2) Dissolve 1.94 g of bismuth nitrate pentahydrate in a mixed solution of ethanol and ethylene glycol, stir and dissolve to obtain a dispersion.

[0042] (3) Cut out a small piece of the carbonized melamine foam obtained in step (1) and put it into a polytetrafluoroethylene hydrothermal reactor, and pour the uniform dispersion obtained in step (2) into it to ca...

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Abstract

The invention discloses a preparation method of a supercapacitor electrode material based on carbonized melamine foam-coated Bi2O3 nanosheets. The preparation method comprises the following steps: (1)carrying out hydrothermal reaction on water-soluble bismuth salt and the carbonized melamine foam; (2) removing residual solvents, Bi <3+> and NO3 <-> by using a cleaning agent to obtain an intermediate product; (3) reacting in an inert atmosphere, annealing the intermediate product and filtering to obtain the supercapacitor electrode material based on melamine carbide foam-coated Bi2O3 nanosheets. The invention provides a simple solvothermal method. According to the method, Bi2O3 nanosheets are grown on carbonized melamine foam in situ to form a three-dimensional nuclear sheath structure. The electrode material has good electrical conductivity and high specific surface area. The storage of electrolyte is facilitated and the diffusion path of electrolyte ions is shortened. The contact area of the electrolyte and the material is increased, so that the capacitance is improved. Moreover, when the capacitor is constructed, the use of a binder and a conductive additive is avoided. The prepared material can be made into a flexible electrode. The preparation method is simple, harmless to the environment and low in cost.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a carbonized melamine foam@Bi 2 O 3 Preparation method of 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 constantly emerging. With the advent of smart electronic products, it is urgent to develop micro-nano energy storage devices that are highly compatible with them to solve power problems. As an emerging energy storage device, supercapacitors have attracted widespread attention due to their ability to bridge the gap between batteries and traditional capacitors. To meet the huge demand for 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. Supercapacito...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/32H01G11/46H01G11/48H01G11/86C01G29/00C01B32/05B82Y30/00B82Y40/00
CPCY02E60/13
Inventor 孙义民易荣华周爱军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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