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Nitrogen-doped porous carbon sphere/S composite material, preparation method thereof and application of nitrogen-doped porous carbon sphere/S composite material in lithium-sulfur battery

A nitrogen-doped porous carbon and composite material technology, which is applied in lithium batteries, carbon preparation/purification, battery electrodes, etc., can solve the problems of poor conductivity of active materials, achieve excellent conductivity, strong chemical and physical adsorption capacity, The effect of high electrical contact area

Pending Publication Date: 2022-07-15
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a nitrogen-doped porous carbon sphere / S composite material and its preparation method and application in lithium-sulfur batteries. Positive sulfur host, effectively inhibiting polysulfide shuttle, volume expansion and improving the poor conductivity of active materials

Method used

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  • Nitrogen-doped porous carbon sphere/S composite material, preparation method thereof and application of nitrogen-doped porous carbon sphere/S composite material in lithium-sulfur battery
  • Nitrogen-doped porous carbon sphere/S composite material, preparation method thereof and application of nitrogen-doped porous carbon sphere/S composite material in lithium-sulfur battery
  • Nitrogen-doped porous carbon sphere/S composite material, preparation method thereof and application of nitrogen-doped porous carbon sphere/S composite material in lithium-sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0047] Step 1: Preparation of nitrogen-doped porous carbon spheres for lithium-sulfur battery cathode sulfur carrier

[0048] (1) take by weighing an appropriate amount of zinc nitrate hexahydrate and add it to deionized water, configure the zinc nitrate aqueous solution of 0.012 mol / L to obtain A solution;

[0049] (2) Weigh an appropriate amount of 2-methylimidazole and add it to deionized water, configure 0.12 mol / L of 2-methylimidazole aqueous solution to obtain B solution;

[0050] (3) Mix the A solution with the B solution, control the temperature of the reaction solution to be 10°C, and stir the reaction for 3h;

[0051] (4) transferring the reaction solution obtained in step (3) into a centrifuge tube, using a centrifuge at 7000 rpm / min to separate the solid-phase product, washing with deionized water, and freeze-drying to obtain a white powder;

[0052] (5) The white powder of step (4) is placed in a quartz boat, and carbonized at 900° C. under a nitrogen atmosphere ...

Embodiment 2

[0062] Step 1: Preparation of nitrogen-doped porous carbon spheres for lithium-sulfur battery cathode sulfur carrier

[0063] (1) take by weighing an appropriate amount of zinc nitrate hexahydrate and add it to deionized water, configure the zinc nitrate aqueous solution of 0.012 mol / L to obtain A solution;

[0064] (2) Weigh an appropriate amount of 2-methylimidazole and add it to deionized water, configure 0.12 mol / L of 2-methylimidazole aqueous solution to obtain B solution;

[0065] (3) Mix the A solution with the B solution, control the temperature of the reaction solution to be 20°C, and stir the reaction for 3h;

[0066] (4) transferring the reaction solution obtained in step (3) into a centrifuge tube, using a centrifuge at 7000 rpm / min to separate the solid-phase product, washing with deionized water, and freeze-drying to obtain a white powder;

[0067] (5) The white powder of step (4) is placed in a quartz boat, and carbonized at 900° C. under a nitrogen atmosphere ...

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Abstract

The invention discloses a nitrogen-doped porous carbon sphere / S composite material as well as a preparation method and application thereof in a lithium-sulfur battery, and the preparation method of the nitrogen-doped porous carbon sphere / S composite material comprises the following steps: mixing a solution A and a solution B, and reacting in a specific temperature range; separating a solid-phase product, washing with deionized water, and drying to obtain white powder; the solution A comprises zinc salt and deionized water; the solution B comprises 2-methylimidazole and deionized water; carbonizing the dried sample to obtain a nitrogen-doped porous carbon sphere material; and uniformly mixing the nitrogen-doped porous carbon spheres with sublimed sulfur, and carrying out heat treatment to obtain the nitrogen-doped porous carbon sphere / S composite material. The nitrogen-doped porous carbon sphere material obtained through low-temperature regulation and control of water system ZIF coordination behavior and heat treatment has good physical and chemical adsorption effects on polysulfide and large specific surface area, can effectively inhibit the shuttle effect of the polysulfide, reduces the positive electrode electron transfer resistance, relieves the volume change of charge and discharge products, improves the sulfur utilization rate, and has a good application prospect. And finally obtaining the lithium-sulfur battery with long cycle stability.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a nitrogen-doped porous carbon ball / S composite material, a preparation method thereof, and an application in a lithium-sulfur battery. Background technique [0002] With the continuous development of human society, the demand for energy is increasing day by day. Traditional fossil energy has been unable to meet the green and sustainable development concept of today's society due to its shortcomings such as non-renewable and environmental pollution. Therefore, the development of clean and efficient energy acquisition and storage technology has become the common pursuit of all human society. Lithium-sulfur battery has a high theoretical specific capacity of 1675 mAh g -1 and theoretical energy density of 2600 Wh Kg -1 , which is considered to be one of the most promising energy storage systems in the new generation of battery systems. At the same time, in the lith...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01B17/00H01M4/36H01M4/38H01M4/62H01M10/052
CPCC01B32/05C01B17/00H01M4/628H01M4/624H01M4/362H01M4/38H01M10/052H01M2004/028Y02E60/10
Inventor 程年才俞立跃
Owner FUZHOU UNIVERSITY
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