This technology relates to a lithium-sulfur battery cathode material in which sulfur is contained within N-doped carbon nanotubes and nickel and cobalt sulfide nanocrystalline materials are dispersed on the surface of N-doped carbon nanotubes. In particular, it is a technology designed to enhance performance, durability, stability, and applicability based on the lithium-sulfur battery cathode material, its manufacturing method, and key materials, structures, processes, or device configurations related to lithium-sulfur secondary batteries using the same.
The present invention aims to resolve the degradation of lifespan caused by the shuttle effect and large volume changes of the anode in lithium-sulfur batteries during the aforementioned cycle, and to provide a lithium-sulfur battery with superior lifespan characteristics. Accordingly, this technology applies the steps of manufacturing the nitrogen-doped carbon nanotubes and the nickel-thiourea compound, and synthesizing the cobalt-thiourea compound as core means, and proposes a technical concept that implements the inclusion of transition metal sulfide nanocrystalline structures on the surface of the N-doped carbon nanotubes.
Accordingly, the present invention is expected to improve the recyclability of lithium-sulfur batteries and enhance their lifespan characteristics, while simultaneously increasing reproducibility, scalability, and process suitability in real-world usage environments. Furthermore, it can be utilized in related industries as a high-performance material, device, battery, sensor, apparatus, or manufacturing process, making it advantageous in terms of subsequent commercialization and demonstration development.
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