Coupling of Oxygen Vacancies and Heterostructure on Fe O via an Anion Doping Strategy to Boost Catalytic Activity for Lithium-Sulfur Batteries.

The sluggish reaction kinetics and severe shutting behaviors of sulfur cathodes are the major roadblocks to realizing the practical application of lithium-sulfur (Li-S) batteries and need to be solved through designing/constructing rational sulfur hosts. Herein, an effective alternative material of Fe O /FeP in-situ embedded in N-doped carbon-tube (Fe O /FeP/NCT) is proposed. In this fabricated heterostructure, NCT skeleton works as a sulfur host provides physical barrier for lithium polysulfides (LiPSs), while Fe O /FeP heterostructure with abundant oxygen vacancies provides double active centers to simultaneously accelerate e /Li diffusion/transport kinetics and catalysis for LiPSs.