A method for preparing a lithium-sulfur battery positive electrode material

Abstract

A method for preparing a lithium-sulfur battery positive electrode material is disclosed. The method includes 1) adding resorcinol, furfural and hexamethylenetetramine in order into a solvent and mixing the mixture; 2) subjecting the solution obtained in the step 1) to sealed thermal treatment to obtain gel; 3) subjecting the obtained gel to thermal treatment to obtain xerogel; 4) crushing the xerogel obtained in the step 3), feeding nitrogen, and performing thermal treatment to obtain nitrogen doped carbon aerogel; 5) adding hydrochloric acid, sodium thiosulfate pentahydrate, a dispersing agent and the carbon aerogel obtained in the step 4) into distilled water in order and stirring the mixture; 6) subjecting the suspension obtained in the step 5) to ultrasonic treatment for 20 min; 7) subjecting the solution obtained in the step 6) to suction filtration to obtain black powder; and 8) subjecting the black powder obtained in the step 7) to thermal treatment at 155 DEG C for 24 h to obtain the nitrogen doped carbon aerogel adsorbed material as the lithium-sulfur battery positive electrode material. The method is simple, high in cost performance ratio, good in reproducibility and suitable for commercial production.

Description

technical field [0001] The invention relates to the technical field of preparation methods of battery cathode materials, in particular to a preparation method of lithium-sulfur battery cathode materials. Background technique [0002] Lithium-sulfur battery is considered as a new type of energy storage device due to its high cost performance, high specific energy density, and environmental friendliness. It is used in mobile equipment, large electrical equipment, aerospace and electric / hybrid vehicles, etc. in the field. This secondary lithium-sulfur battery uses sulfur as the positive electrode and metal lithium as the negative electrode, and provides energy through the chemical reaction between lithium and sulfur. When sulfur and lithium completely react, its theoretical specific energy is as high as 1680mAh / g, which is 3 to 5 times that of traditional lithium batteries, and can fully meet the needs of high-capacity fast-charging power devices. However, the poor conductivi...

AI Technical Summary

Problems solved by technology

However, the poor conductivity of sulfur, the cathode material of lithium-sulfur batteries, seriously affects the electrochemical performance of the battery, resulting in a decrease in battery capacity, while the existence of the shuttle effect leads to low battery capacity retention, poor cycle performance, and severely shortened battery life. battery safety

[0003] Traditional carbon materials such as conductive carbon black have small specific surface area and general adsorption performance. Carbon materials such as carbon nanotubes and graphene are expensive and the synthesis process is complicated.

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