Preparation method of selenium composite electrode material

Abstract

The invention relates to a preparation method of a selenium composite electrode material. The method comprises the steps that soluble sulfite and selenium are used as raw materials, selenosulfate is generates through a reaction, a carbon material with high specific surface area and electrical conductivity is used as a carrier, selenium and polymer are deposited, and the selenium composite electrode material is obtained; the selenium deposition speed can be controlled by controlling the alcoholic solution concentration, variety and dropping-in speed; the small-particle selenium composite electrode material coated evenly is obtained. When used for a positive electrode of a lithium selenium battery, the selenium composite electrode material has the high specific capacity and excellent circulation performance, and has the good application prospect in the battery field.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a preparation method of a selenium composite electrode material. Background technique [0002] Lithium-selenium batteries have the advantages of high specific capacity and good conductivity, and are very promising energy storage batteries. Compared with other cathode materials, especially the same group of sulfur cathodes, selenium has high conductivity, high utilization rate of active materials, and small capacity fading. As a new metal lithium secondary battery, selenium has very important scientific research value and application potential. The particle size of selenium cathode material is an important factor affecting the performance of lithium selenium batteries. The large particle size of traditional selenium cathode materials leads to low capacity of lithium-selenium batteries, which restricts the promotion and application of lithium-selenium batte...

AI Technical Summary

Problems solved by technology

However, hydrogen selenide is highly toxic, and the mixed air is explosive, and there are safety hazards in the process of use

[0003] It is undeniable that the use of materials with large specific surface area and small pore size to load selenium particles effectively limits the particle size of simple selenium, and at the same time, materials with good conductivity improve the conductivity of simple selenium. However, the current preparation process has high energy consumption, The inconsistent distribution of selenium particles leads to poor product performance and potential safety hazards in the preparation process, which limits its promotion and application; secondly, selenium is deposited on the surface of the material, and the volume expands and contracts during the charge and discharge process. Other coatings will inevitably cause selenium particles to fall off and cause cycle capacity decay

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