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Spherical-like nitrogen-doped reduced graphene oxide material and application thereof

A nitrogen doping and graphene technology, applied in graphene, electrical components, battery electrodes, etc., can solve the problems of reducing polysulfide adsorption capacity, reducing accessible active sites, and uneven distribution of active materials, so as to avoid Loss of specific surface area and active sites, mitigation of shuttle effects, avoidance of adverse effects

Inactive Publication Date: 2019-10-11
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during graphene preparation and subsequent electrode production, graphene sheets tend to form irreversible agglomerates or even restack to form graphite through van der Waals interactions, resulting in a decrease in specific surface area and surface accessible active sites, which will cause Uneven distribution of active materials and reduced adsorption capacity for polysulfides

Method used

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  • Spherical-like nitrogen-doped reduced graphene oxide material and application thereof
  • Spherical-like nitrogen-doped reduced graphene oxide material and application thereof
  • Spherical-like nitrogen-doped reduced graphene oxide material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Improved Hummers method: at room temperature, add 4g graphite to 160mL concentrated sulfuric acid (96wt%) and stir for 12h, then add 5gNaNO 3 Mix evenly, then slowly add 18g of potassium permanganate powder into the above mixed solution within 2h, use a water bath to control the temperature to 7°C, let it stand for 4 days, add 300mL of hydrogen peroxide solution (10wt%) and 100mL of hydrochloric acid solution (10wt%) and stir Uniform, then diluted with deionized water and centrifuged to obtain a weakly acidic graphene oxide aqueous solution with a concentration of 6mg / mL (the centrifuge model is H / T16MM, the speed control is 10000rpm, 5min / time);

[0034] (2) Continuously ultrasonically homogenize the graphene oxide aqueous solution for 7 hours (the ultrasonic machine model is KQ-300DE, the ultrasonic power is set to 100%, and the control temperature is lower than 40°C), and it is processed by a BILON-6000Y spray dryer, The inlet temperature is set to 170°C, the out...

Embodiment 2

[0041] (1) Improved Hummers method: at room temperature, add 3g graphite to 150mL concentrated sulfuric acid (96wt%) and stir for 16h, then add 4gNaNO 3 Mix evenly, then slowly add 16g of potassium permanganate powder into the above mixed solution within 2h, use a water bath to control the temperature to 5°C, let it stand for 4 days, then add 500mL of hydrogen peroxide solution (3wt%) and 200mL of hydrochloric acid solution (5wt%) Stir evenly, then dilute and centrifuge with deionized water to obtain a weakly acidic graphene oxide aqueous solution with a concentration of 0.5mg / mL (the centrifuge model is H / T16MM, the speed is controlled at 8000rpm, 15min / time);

[0042] (2) Continuously ultrasonically homogenize the graphene oxide aqueous solution for 4 hours (the ultrasonic machine model is KQ-300DE, the ultrasonic power is set to 100%, and the control temperature is lower than 40°C), and it is processed by a BILON-6000Y spray dryer, The inlet temperature is set to 150°C, the...

Embodiment 3

[0048] (1) Improved Hummers method: at room temperature, add 4g graphite to 150mL concentrated sulfuric acid (96wt%) and stir for 16h, then add 4gNaNO 3 Mix well, then slowly add 16g of potassium permanganate powder into the above mixed solution within 2h, use a water bath to control the temperature to 10°C, let it stand for 4 days, then add 500mL of hydrogen peroxide solution (3wt%) and 200mL of hydrochloric acid solution (10wt%) Stir evenly, then dilute and centrifuge with deionized water to obtain a weakly acidic graphene oxide aqueous solution with a concentration of 12mg / mL (the centrifuge model is H / T16MM, the speed is controlled at 10000rpm, 10min / time);

[0049] (2) Continuously ultrasonicate the graphene oxide aqueous solution for 10 hours (the model of the ultrasonic machine is KQ-300DE, the ultrasonic power is set to 100%, and the control temperature is lower than 40°C), and it is processed by a BILON-6000Y spray dryer, and the inlet temperature is set 170°C, the ou...

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Abstract

The invention relates to a spherical-like nitrogen-doped reduced graphene oxide material and an application thereof, and belongs to the field of battery materials. The preparation method comprises thefollowing steps of carrying out diluting on a graphene oxide water solution and then performing ultrasonic homogenization treatment, and carrying out spray drying treatment to obtain spherical-like graphene oxide powder; and next, performing grinding and mixing with a nitrogen source, and carrying out heat preserving for 0.5-6 hours at the temperature of 600-1,200 DEG C to obtain the product. Thespherical-like nitrogen-doped reduced graphene oxide material has the advantages of high conductivity, high wrinkle, large specific surface area and hierarchical pore structure; rich functional groups can be introduced by virtue of doped nitrogen atoms, so that the adverse effects caused by serious stacking of the graphene are avoided. The material and the sulfur are compounded to serve as a positive electrode material of a lithium sulfur battery, so that the uniform dispersion of the active substance can be realized, the sulfur carrying amount can be increased, the conductivity of the electrode can be improved, the " shuttle effect " can be reduced, and finally the electrochemical performance of the sulfur positive electrode is improved.

Description

technical field [0001] The invention relates to a quasi-spherical nitrogen-doped reduced graphene oxide material and an application thereof, belonging to the field of battery materials. Background technique [0002] With the development of science and technology and the continuous progress of human society, the global energy system based on fossil energy is increasingly worrying about environmental degradation and energy shortages, which promotes the rapid development of new energy and renewable energy. Lithium-ion batteries as a new The green recyclable energy storage device in the energy field has the advantages of mature technology, small self-discharge, and long working time. It has been widely used in portable electronic devices, new energy electric vehicles, and energy storage industries, but it is limited by electrode materials. The theoretical specific capacity (<300mAh / g), its energy density is difficult to meet the increasingly high requirements of today's and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/052H01M4/36C01B32/184
CPCC01B32/184H01M4/362H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 穆道斌吴锋吴伯荣刘北元李纯莉赵志坤马瑞褚晓蓉朱宸宥谢慧琳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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