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Preparation method and application of a graphene quantum dot/mesoporous carbon composite material

A technology of graphene quantum dots and composite materials, applied in the field of preparation, graphene quantum dots/mesoporous carbon composite materials, can solve problems such as intermediate product shuttle effect, sulfur volume strain, poor sulfur conductivity, etc., and achieve good conductivity, High theoretical specific capacity and favorable transfer effect

Active Publication Date: 2019-12-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of sulfur as the positive electrode, lithium-sulfur batteries also have problems such as poor conductivity, shuttle effect of intermediate products, and volumetric strain of sulfur.
In recent years, many researchers have combined two or more carbon materials to solve the problems of poor conductivity and shuttle effect of sulfur.

Method used

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  • Preparation method and application of a graphene quantum dot/mesoporous carbon composite material
  • Preparation method and application of a graphene quantum dot/mesoporous carbon composite material
  • Preparation method and application of a graphene quantum dot/mesoporous carbon composite material

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preparation example Construction

[0025] The present invention also provides a kind of preparation method of graphene quantum dot / mesoporous carbon composite material, it is characterized in that, comprises the following steps:

[0026] A) mixing and stirring the aqueous solution of resole phenolic resin and a surfactant, and performing a heating reaction to obtain a surfactant-phenolic single micelle solution, wherein the surfactant is selected from F127 or P123;

[0027] B) Mix the graphene quantum dot aqueous solution with the step A) surfactant-phenolic single micelle solution, then carry out hydrothermal reaction at 130°C-180°C for 20h-30h, and the reaction product is freeze-dried and then annealed at high temperature, carbonized, cleaned and After drying, the graphene quantum dot / mesoporous carbon composite material is obtained.

[0028] The present invention uses graphene quantum dots and surfactant-phenolic single micelles as raw materials to prepare composite materials. In the present invention, the g...

Embodiment 1

[0065] F127-phenolic single micellar solution was obtained by aqueous phase synthesis. The details are as follows: Dissolve phenol at 40°C, keep magnetic stirring, slowly add NaOH aqueous solution, then add formalin aqueous solution drop by drop, control the molar ratio of the four, phenol: formaldehyde: NaOH: H 2 O is 2.1:10:0.5:580. Stirring at 70°C for 0.5h, a low molecular weight resole phenolic resin was obtained. Then add F127, control the molar ratio of F127 and phenolic resin to 0.035, continue to stir the obtained mixed solution at 70°C for 2 hours, add 50mL of deionized water to dilute, continue heating at 70°C for 12h to obtain dark red F127-phenolic resin Beam solution.

[0066] Graphene quantum dots adopt the following method: First, weigh 1.5g of glucose, add 10m deionized water to the polytetrafluoroethylene liner of the 50mL reactor to dissolve, and stir evenly with a glass rod; slowly inject 10mL of concentrated sulfuric acid, and at the same time use a glas...

Embodiment 2

[0079] Change the 65mL 0.05mol / L pre-dispersed graphene quantum dot aqueous solution in embodiment 1 into 65mL0.25mol / L pre-dispersed graphene quantum dot aqueous solution, stir and seal in the polytetrafluoroethylene lining of 100mL In a stainless steel reaction kettle, heat water at 130°C for 20h. The graphene quantum dots and resole phenolic resin ratios are respectively 1:100 graphene quantum dots / mesoporous carbon composite material precursor. The precursor was annealed at 400°C for 2h, after removing the surfactant F127, and then carbonized at 700°C for 3h to obtain a graphene quantum dot / mesoporous carbon composite material, in which graphene quantum dots and mesoporous carbon The mass ratio of carbon is 1:60. . Dissolve 1.2 g of 2 S and the graphene / mesoporous carbon composite material obtained in Comparative Example 1 of 0.8g were mixed, and left standing at room temperature for one day to be treated by CS 2 After the volatilization is complete, seal it and put it...

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Abstract

The invention provides a graphene quantum dot / mesoporous carbon composite material which comprises mesoporous carbon and graphene quantum dots filled into mesopores of the mesoporous carbon. The specific surface area of the graphene quantum dot / mesoporous carbon composite material is 800-1,000m<2> / g, and the pore volume is 2-4cm<3> / g. The graphene quantum dot / mesoporous carbon composite material is capable of providing good conductivity and relatively large specific surface area, and is beneficial to transfer of electrons and ions. Meanwhile, the graphene quantum dots entering the inside of the mesoporous carbon are capable of inhibiting dissolution and diffusion of polysulfide while supporting sulfur. By adopting the special structure, the material has relatively high theoretical specific capacity and cycle performance as a positive electrode material of a lithium-sulfur carrier.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a graphene quantum dot / mesoporous carbon composite material, a preparation method and an application. Background technique [0002] Mesoporous carbon refers to porous carbon with a pore diameter between 2nm and 50nm. At present, there are two main methods for the synthesis of mesoporous carbon: hard template method and soft template method. The hard template method is to use a relatively "hard" porous material with a rigid framework such as porous anodized lead oxide and porous silicon as a template, and then prepare a mesoporous material by copying the template structure and finally removing the template. The advantage of using the hard template method to synthesize mesoporous materials is that it is universal, and the synthesized mesoporous materials can completely inherit the structure of the hard template. The soft template method uses "soft" organic mole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/38H01M10/052C01B32/184
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 葛相麟周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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