Graphene-based flexible lithium-sulfur battery positive electrode material, preparation method of positive electrode material and preparation method of positive electrode

Abstract

The invention relates to a graphene-based flexible lithium-sulfur battery positive electrode material, a preparation method of the positive electrode material and a preparation method of a positive electrode, aiming at solving the technical problems that an existing carbon nano tube-sulfur flexible electrode is expensive and high in cost. The graphene-based flexible lithium-sulfur battery positive electrode material is a flexible film formed by uniformly coating elemental sulfur particles with sheet-shaped reduced graphene. The preparation method comprises the following steps: mixing an Na2S2O3 solution with reduced graphene dispersion liquid, carrying out ultrasonic dispersion, adding a hydrochloric acid solution with assistance of ultrasonic waves, carrying out vacuum filtration, cleaning and drying after reaction, and separating a filter membrane from substances on the filter membrane, so as to obtain the graphene-based flexible lithium-sulfur battery positive electrode material; and carrying out compression and lamination, so as to obtain the positive electrode. When the content of sulfur in the positive electrode is 60%, the specific capacity of the electrode reaches 416mAh/g. The graphene-based flexible lithium-sulfur battery positive electrode material can be applied to the preparation of flexible lithium-sulfur batteries.

Description

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AI Technical Summary

Benefits of technology

This patented technology involves making an electrically conductive layer on a special type of carbon called flexgraphite that can be easily bent or folded into different shapes for use in batteries like electric cars. These materials have many advantages such as being easy to make at low costs while still having excellent performance compared to traditional methods used for producing these types of cathodes. They also provide improved cycling durability over time due to their strong support structures without any metallic components attached thereto.

Problems solved by technology

This patents discusses how chemistry plays an essential role when developing novel types of advanced electrical devices called Lithium ion (Li) secondary cells due to its unique properties like long lifetimes, stable performance over time, and environmentally friendly nature. Current methods involve adding more active ingredients into the cell's structure through impregnating them onto the surface of certain metals. These techniques can be complicated and require significant investment costs. Additionally, there remains room for improvement in terms of producing these improved compositions while reducing manufacturing complexity and improving efficiency.

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