Composite for functional permeable layer of lithium-sulfur battery with high capacity, preparation method

High-capacity lithium-sulfur secondary battery with reduced shuttle phenomenon

This technology is about the manufacturing method of a composite for the functional transmission layer of a high-capacity lithium-sulfur battery

Lithium-sulfur batteries, which are emerging as a new alternative, have high theoretical capacity and high energy density and are being studied as next-generation batteries. However, the shuttle phenomenon, which is a problem of lithium-sulfur batteries, must be alleviated and the electrical conductivity of sulfur must also be improved. To achieve this goal, this technology proposes a method using reduced graphene oxide and porous vanadium nitride.

This technology can alleviate the shuttle phenomenon of lithium-sulfur batteries by improving the adsorption capacity with lithium polysulfide and promoting oxidation-reduction dynamics. It has excellent electrical conductivity and improves the utilization of sulfur by compensating for the low electrical conductivity of sulfur. This technology has the advantage of cycle stability and high capacity, and is expected to greatly contribute to the commercialization of lithium-sulfur secondary batteries.

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Key Features:

• The key is to manufacture a vanadium oxide (V2O5) precursor by drying and pulverizing it after solvothermal synthesis
• Producing porous vanadium nitride by heat-treating vanadium oxide in an ammonia gas atmosphere
• Producing a vanadium nitride/reduced graphene oxide composite by mixing it with reduced graphene oxide
• Providing a functional transmission layer for lithium-sulfur batteries

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This technology was developed through support from the National Research Foundation of Korea's functional interface structure research project for lithium cathode-based high-capacity energy storage.

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