Sulfur/polypyrrole composite cathodes for applications in high energy density lithium-sulfur cells

摘要

Lithium-sulfur cells are quite promising devices for the next generation energy storage applications. However, their specific capacity and cycling stability are adversely affected by poor electrical conductivity of sulfur, shuttling effect of lithium polysulfides and the volume expansion of sulfur during lithium intake. These limitations can be averted through modifying the sulfur cathode by making composites with electrically conducting polymers and carbon nanostructures. The work presented in this paper mainly deals with the modification of sulfur cathode by making composites with polypyrrole, graphene, and polypyrrole/graphene and the investigations carried out to assess their suitability to design Li-S cells with high energy density and good cycling stability.