Hybrid Sulfur Particles with Polymeric Coating for Battery Cathodes

The patent uses transition metal compounds (such as Fe2O3, Co3O4, NiO) as intermediary materials that serve dual functions: they provide electrical conductivity pathways similar to carbon additives, and they act as polysulfide hosts through surface adsorption. This intermediary approach allows achieving conductivity enhancement without using traditional carbon additives that dilute sulfur content, thus resolving the contradiction between improving conductivity and maintaining high sulfur content.

The patent creates composite materials where transition metal compounds are integrated with sulfur to form hybrid structures. These composites provide the necessary conductivity and structural support without relying on carbon hosts that would dilute sulfur content. The composite approach allows achieving both high conductivity and high sulfur content by selecting materials with complementary properties.

The patent uses transition metal compounds as intermediary materials that can host and immobilize polysulfides through surface adsorption mechanisms. This intermediary function prevents polysulfide diffusion and mass loss without requiring microporous carbon interlayers that would reduce sulfur content. The transition metal surfaces provide active sites for polysulfide anchoring, achieving mass loss control while maintaining high sulfur content.

The patent uses transition metal compounds as intermediaries that not only provide conductivity but also host polysulfides, preventing their diffusion to the anode. By preventing polysulfide accumulation at the anode, the intermediary materials avoid anode passivation and maintain long cycle life. This dual-function intermediary approach resolves the contradiction between achieving high conductivity and maintaining long cycle life.