This technology is a cathode structure for lithium-sulfur batteries that maximizes physical strength and electrochemical active surface area by anchoring and uniformly dispersing sulfur-containing materials within a 3D network structure formed by graphene and carbon nanotubes (CNTs), then compression-molding them into pellets.
Conventional lithium-sulfur battery cathodes suffered from low active material utilization due to sulfur particle agglomeration and structural collapse of the pellets during cycling. Furthermore, under high-loading conditions, they faced limitations such as the polysulfide shuttle effect and reduced ionic conductivity caused by increased electrolyte viscosity.
This technology improves dispersibility by mixing and stirring the active material in a binder solution, embeds sulfur into the graphene-CNT network, and then pelletizes it at 50–1000 MPa and 40–80°C to ensure structural stability. Additionally, a fluorine-based diluent like TTE is added to the electrolyte to suppress viscosity increases caused by polysulfides. It can be applied to fields where energy-to-weight ratio is critical, such as drones, high-altitude UAVs, and lightweight wearable power sources, enabling the realization of high-loading sulfur cathodes with reduced binder content without structural collapse.
CN118525384A, EP4459705A1, US2024-0313194A1, WO2023-128592A1
