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Preparation method of nitrogen-doped yolk-shaped carbon sphere/graphene composite material

A composite material and nitrogen doping technology, applied in the field of new energy electronic materials, can solve problems such as not achieving the desired effect

Active Publication Date: 2020-10-23
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the current point of view, the application of graphene-based composite materials in the field of lithium-sulfur batteries has not achieved ideal results, and other graphene-based composite materials with special structures and morphologies are still to be developed.
Combining nitrogen-doped yolk-like phenolic resin-based carbon spheres with graphene, a lithium-sulfur battery cathode material with ultra-high specific capacity and excellent cycle stability is prepared, which belongs to a new lithium-sulfur battery energy storage material and has not yet been reported.

Method used

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  • Preparation method of nitrogen-doped yolk-shaped carbon sphere/graphene composite material
  • Preparation method of nitrogen-doped yolk-shaped carbon sphere/graphene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Ultrasonicate 160 ml of deionized water and 60 ml of absolute ethanol to obtain a uniform mixed solution, pour it into a three-necked bottle, add 0.8 ml of ammonia water, and put the three-necked bottle into 0 o C in a cold bath with stirring. Add 1.8 g of resorcinol to the three-necked flask, and stir to dissolve. Take a 50ml beaker, add 2 g melamine and 4.5238 g formaldehyde to it, put 60 o C in a water bath and stirred until the solution was clear, then poured into a three-neck flask and continued to stir. After 10 min, 2.5 ml of formaldehyde solution was added dropwise to the bottle, and stirred for 24 h. The product was alternately washed 4 times with deionized water and absolute ethanol, and then the product was freeze-dried. After the drying is completed, weigh 0.2 g of the product, and 200 ml of the concentration is 1mg ml -1 Graphite oxide dispersion solution was blended, and after stirring for 4 hours, 1.2 g KOH was weighed, dissolved in 50 ml deionized wa...

Embodiment 2

[0034] Ultrasonicate 160 ml of deionized water and 60 ml of absolute ethanol to obtain a uniform mixed solution, pour it into a three-necked bottle, add 0.8 ml of ammonia water, and put the three-necked bottle into 0 o C in a cold bath with stirring. Add 1.8 g of resorcinol to the three-necked flask, and stir to dissolve. Take a 50ml beaker, add 2 g melamine and 4.5238 g formaldehyde to it, put 60o C in a water bath and stirred until the solution was clear, then poured into a three-neck flask and continued to stir. After 10 min, 2.5 ml of formaldehyde solution was added dropwise to the bottle, and stirred for 24 h. The product was alternately washed 4 times with deionized water and absolute ethanol, and then the product was freeze-dried. After the drying is completed, the powder is placed in a tube furnace for pre-carbonization, and the carbonization temperature is 300 o C, holding time 1 h. Weigh 0.4 g product, and 200 ml concentration is 1mg ml -1 Graphite oxide dispers...

Embodiment 3

[0038] Ultrasonicate 160 ml of deionized water and 60 ml of absolute ethanol to obtain a uniform mixed solution, pour it into a three-necked bottle, add 0.8 ml of ammonia water, and put the three-necked bottle into 0 o C in a cold bath with stirring. Add 1.8 g of resorcinol to the three-necked flask, and stir to dissolve. Take a 50ml beaker, add 2 g melamine and 4.5238 g formaldehyde to it, put 60 o C in a water bath and stirred until the solution was clear, then poured into a three-neck flask and continued to stir. After 10 min, 2.5 ml of formaldehyde solution was added dropwise to the bottle, and stirred for 24 h. The product was alternately washed 4 times with deionized water and absolute ethanol, and then the product was freeze-dried. After the drying is completed, the powder is placed in a tube furnace for pre-carbonization, and the carbonization temperature is 300 o C, holding time 1 h. Weigh 0.6 g of product and 200 ml to a concentration of 1 mg ml -1 Graphite oxi...

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Abstract

The invention relates to a preparation method of a nitrogen-doped yolk-shaped carbon sphere / graphene composite material. The preparation method comprises the following steps: pouring deionized water and absolute ethyl alcohol into a three-necked bottle after ultrasonic treatment, adding a small amount of ammonia water, and stirring the three-necked bottle in a cold bath; adding 1.0-3.0 g of resorcinol, and stirring and dissolving the mixture; stirring and dissolving melamine and formaldehyde in a water bath at 60 DEG C, adding the mixture into a three-necked bottle, stirring for a period of time, adding a formaldehyde solution, and stirring for 24 hours; centrifugally washing the product for multiple times, freeze-drying, and pre-carbonizing the sample at low temperature; and weighing 0.1-0.6 g of the product, blending the product with the graphite oxide dispersion solution, stirring for 4 hours, adding a solution containing 1.6-2.4 g of KOH, continuing stirring for 1 hour, and carrying out freeze drying; carrying out high temperature carbonization treatment on the product; pickling the carbonized product to remove residual KOH and salts generated in the high-temperature heat treatment process, and then centrifugally washing to be neutral to obtain the nitrogen-doped yolk-shaped carbon sphere and graphene composite electrode material. According to the nitrogen-doped yolk-shapedcarbon sphere / graphene composite material prepared by the invention, the conductivity and the energy storage property of the graphene-based composite material can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of new energy electronic materials, and relates to a preparation method of a nitrogen-doped yolk-shaped carbon sphere / graphene composite material. Background technique [0002] Today's global energy crisis is becoming more and more serious, and people are eager to find a new type of energy storage system with application prospects. Lithium-sulfur batteries use the abundant, low-cost, non-toxic and non-polluting sulfur element as the positive electrode active material, and their theoretical specific capacity and energy density are as high as 1675 mAh g, respectively. -1 and 2600 Wh kg -1 , has received more and more attention from scientists. However, due to the shuttle effect of the polysulfides produced during the discharge process of lithium-sulfur batteries dissolved in the electrolyte, and the large volume change of ~80% in the active material-elemental sulfur during the process, the lithium-sulfur bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/625H01M10/0525H01M4/38Y02E60/10
Inventor 李梅林振航宁瑶张云强
Owner QILU UNIV OF TECH
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