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A kind of preparation method of hollow graphene ball/sulfur composite material

A technology of graphene spheres and composite materials, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve problems such as high self-discharge rate, low Coulombic efficiency, and poor cycle performance of lithium-sulfur batteries. To achieve the effect of low production cost

Active Publication Date: 2018-08-17
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the discharge process of lithium-sulfur batteries, elemental sulfur is reduced to S -2 There will be multiple intermediate states generated during the process, where Li 2 Sn (4≤n≤8) is easily soluble in the organic electrolyte, diffuses from the positive electrode to the negative electrode, and eventually generates Li at the negative electrode as the discharge progresses 2 S is deposited, while Li 2 S is insoluble in organic electrolyte, which causes problems such as poor cycle performance, low Coulombic efficiency, and high self-discharge rate of lithium-sulfur batteries, which delays the pace of its practical application.

Method used

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  • A kind of preparation method of hollow graphene ball/sulfur composite material
  • A kind of preparation method of hollow graphene ball/sulfur composite material
  • A kind of preparation method of hollow graphene ball/sulfur composite material

Examples

Experimental program
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Embodiment 1

[0028] 1) Preparation of silica nanospheres: Dissolve 1.6mL tetraethylorthosilicate (TEOS) in 44mL absolute ethanol as solution A. Dissolve 10 mL of ammonia water in 44 mL of absolute ethanol as solution B. Dissolve 2 mL of tetraethylorthosilicate (TEOS) in 88 mL of absolute ethanol as solution C.

[0029] Add liquid A and liquid B into a three-necked flask with mechanical stirring and start stirring at the same time, the rotation speed is about 350r / min. After 30 minutes of reaction, add 8mL ammonia water from the side port of the three-necked flask, and react for 5-10 minutes. Then add liquid C and continue the reaction for 2h.

[0030] After the reaction, the solid phase was taken by centrifugation and washed with deionized water to obtain 0.3 g of silica nanospheres.

[0031] 2) Preparation of hollow graphene spheres: Pour 0.2 g of the prepared silica nanospheres into 50 mL of deionized water for ultrasonic dispersion, then transfer them into a beaker, and then add 250 m...

Embodiment 2

[0034] 1) Preparation of silica nanospheres: Dissolve 3.2mL tetraethylorthosilicate (TEOS) in 88mL absolute ethanol as liquid A. Dissolve 20mL of ammonia water in 88mL of absolute ethanol as solution B. Dissolve 4 mL of tetraethylorthosilicate (TEOS) in 176 mL of absolute ethanol as solution C.

[0035] Add liquid A and liquid B into a three-necked flask with mechanical stirring and start stirring at the same time, the rotation speed is about 350r / min. After 30 minutes of reaction, add 8mL ammonia water from the side port of the three-necked flask, and react for 5-10 minutes. Then add liquid C and continue the reaction for 2h.

[0036] After the reaction, the solid phase was taken by centrifugation and washed with deionized water to obtain 0.6 g of silica nanospheres.

[0037]2) Preparation of hollow graphene spheres: Pour 0.4g of prepared silica nanospheres into 100mL of deionized water for ultrasonic dispersion, then transfer them into a beaker, and then add 500mg of cetyl...

Embodiment 3

[0040] 1) Preparation of silica nanospheres: Dissolve 4.8mL tetraethylorthosilicate (TEOS) in 132mL absolute ethanol as solution A. Dissolve 30mL ammonia water in 132mL absolute ethanol as solution B. Dissolve 6 mL of tetraethylorthosilicate (TEOS) in 264 mL of absolute ethanol as solution C.

[0041] Add liquid A and liquid B into a three-necked flask with mechanical stirring and start stirring at the same time, the rotation speed is about 350r / min. After 30 minutes of reaction, add 8mL ammonia water from the side port of the three-necked flask, and react for 5-10 minutes. Then add liquid C and continue the reaction for 2h.

[0042] After the reaction, the solid phase was taken by centrifugation and washed with deionized water to obtain 0.9 g of silica nanospheres.

[0043] 2) Preparation of hollow graphene spheres: Pour 0.5g of prepared silica nanospheres into 150mL of deionized water for ultrasonic dispersion, then transfer them into a beaker, and then add 750mg of cetylt...

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Abstract

A method for preparing a hollow graphene sphere / sulfur composite material belongs to the technical field of chemical batteries. After the ethanol solution of tetraethylorthosilicate, the ethanol solution of ammonia water and ammonia water are mixed and reacted, silicon dioxide nanospheres are obtained; Silicon nanospheres and hexadecyltrimethylammonium bromide are dispersed in deionized water, then graphene oxide aqueous solution is added, centrifuged after stirring and reacting, the solid phase is taken, washed, dried, and then placed in a vacuum tube furnace for high temperature reduction. Then add HF aqueous solution for corrosion reaction to obtain hollow graphene spheres; finally, mix hollow graphene spheres and sulfur for hot-melt sulfur volatilization reaction to obtain hollow graphene / sulfur composite materials. The production cost of the invention is low, and the manufactured product is beneficial to form a conductive network and improve conductivity.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and in particular relates to a method for preparing a hollow graphene sphere / sulfur composite material which can be used as a lithium-sulfur cathode material. Background technique [0002] Energy is one of the basic elements to maintain social development. Before the industrial revolution, the need for energy was not so urgent. After the industrial revolution, the demand for energy became more and more serious. Nowadays, with the development of human society and productivity, the energy problem has become a world-wide primary problem, and it has also aroused extensive attention of governments and scientific researchers in various countries. To deal with energy problems, the current solutions are roughly divided into three categories. One is to develop and utilize new available energy sources, such as solar energy, wind energy, and geothermal energy. The second is to reduce energy us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/587H01M4/625H01M10/052Y02E60/10
Inventor 刁国旺吴震王彦婷王伟陈晨李科伦廖云云倪鲁彬
Owner YANGZHOU UNIV