Sulfur nanoparticles, preparation thereof, and preparation of lithium sulfur battery positive electrode by sulfur nanoparticles

A lithium-sulfur battery, nano-sulfur technology, applied in the preparation/purification of sulfur, battery electrodes, lithium storage batteries, etc., can solve the problem of inability to meet the commercialization requirements of lithium-sulfur batteries, unsatisfactory high-rate performance, and unfavorable large-scale production, etc. The problem is to increase the electrochemical reaction rate, the method is simple and easy to operate, and the size is small.

Active Publication Date: 2018-01-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method is complicated, not conducive to large-scale production, and the sulfur loading is low, and the high-rate performance is not particularly ideal, which cannot meet the commercial requirements of lithium-sulfur batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step: preparing nano-sulfur particles.

[0026] (1) Dissolve 2.5g of gelatin in 100mL of deionized water. After fully swelling, heat up to 60°C. After the dissolution is complete, stop heating to prepare an aqueous solution of gelatin; take 37.2g of sodium thiosulfate pentahydrate and dissolve it in 50mL of deionized water. In water, sodium thiosulfate solution is prepared; sodium thiosulfate solution is added in aqueous gelatin solution, and stirred evenly;

[0027] (2) Take 25mL of concentrated hydrochloric acid in 75mL of deionized water, and mix to obtain a dilute hydrochloric acid solution;

[0028] (3) Under magnetic stirring conditions, the dilute hydrochloric acid obtained in step (2) was added dropwise to the solution obtained in step (1), after the dropwise addition was completed, reacted for 30 minutes, and the reaction temperature was 60°C;

[0029] (4) Centrifuge the solution obtained in step (3), wash it twice with deionized water, add the lower...

Embodiment 2

[0037] The first step: preparing nano-sulfur particles.

[0038] (1) Dissolve 2.5g of gelatin in 100mL of deionized water. After fully swelling, heat up to 60°C. After the dissolution is complete, stop heating to prepare an aqueous solution of gelatin; take 37.2g of sodium thiosulfate pentahydrate and dissolve it in 50mL of deionized water. In water, sodium thiosulfate solution is prepared; sodium thiosulfate solution is added in aqueous gelatin solution, and stirred evenly;

[0039] (2) Take 25mL of concentrated hydrochloric acid in 75mL of deionized water, and mix to obtain a dilute hydrochloric acid solution;

[0040] (3) Under magnetic stirring conditions, add the dilute hydrochloric acid obtained in step (2) dropwise to the solution obtained in step (1), after the dropwise addition, react for 2 hours, and the reaction temperature is 60°C;

[0041] (4) Centrifuge the solution obtained in step (3), wash it twice with deionized water, add the lower precipitate obtained by c...

Embodiment 3

[0047] The first step: preparing nano-sulfur particles.

[0048] (2) Dissolve 3.6g of gelatin in 100mL of deionized water. After fully swelling, heat up to 60°C. After the dissolution is complete, stop heating to prepare an aqueous gelatin solution; dissolve 37.2g of sodium thiosulfate pentahydrate in 50mL of deionized water In water, sodium thiosulfate solution is prepared; sodium thiosulfate solution is added in aqueous gelatin solution, and stirred evenly;

[0049] (2) Take 25mL of concentrated hydrochloric acid in 75mL of deionized water, and mix to obtain a dilute hydrochloric acid solution;

[0050] (3) Under magnetic stirring conditions, add the dilute hydrochloric acid obtained in step (2) dropwise to the solution obtained in step (1), after the dropwise addition, react for 2 hours, and the reaction temperature is 60°C;

[0051] (4) Centrifuge the solution obtained in step (3), add the lower precipitate obtained by centrifugation into 200mL deionized water, and ultras...

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Abstract

The invention relates to sulfur nanoparticles, preparation thereof, and preparation of a lithium sulfur battery positive electrode by the sulfur nanoparticles, and belongs to the fields of inorganic nanometer materials and electrochemistry. The sulfur nanoparticles are prepared by taking a gelatin aqueous solution as a dispersing agent and a protective agent and by decomposing sodium thiosulfate.The prepared sulfur nanoparticles are uniform in particle size and high in dispersibility. The prepared sulfur nanoparticles are applied to preparation of the lithium sulfur battery positive electrode. Electrochemical performance test proves that the prepared sulfur nanoparticles show excellent electrochemical performance. The method is simple and easy to operate, the used raw materials are low incost, environmental friendliness is achieved, and popularization is facilitated.

Description

technical field [0001] The invention relates to a preparation method of nano-sulfur particles and a preparation method of a lithium-sulfur battery cathode sheet using nano-sulfur particles as an active material, and belongs to the field of inorganic nano-materials and electrochemistry. Background technique [0002] In recent years, with the decrease of fossil energy and the increase of environmental protection pressure, the development and utilization of renewable clean energy is imminent. Novel secondary batteries have received extensive attention as a new generation of energy storage devices. As the current secondary battery system with the best comprehensive performance, lithium-ion batteries have an energy density of 250Wh / Kg, and have the advantages of long cycle life, small self-discharge, and environmental friendliness. However, with the rapid development of electric vehicles, lithium-ion batteries are far from meeting people's requirements for long mileage of electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/06B82Y30/00H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 黄雅钦葛芸伶
Owner BEIJING UNIV OF CHEM TECH
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