Carbon Nanotubes Controllable Winding V₂O₃/Ni Heterostructure for High-Performance Lithium-Sulfur Batteries

Constructing effective sulfur host materials is crucial for enhancing the performance of lithium-sulfur (Li-S) batteries. However, individual carbon or polar materials, such as sulfur host materials, have certain limitations in suppressing the shuttle effect in Li-S batteries. The present study employs carbon nanotubes (CNTs) as the primary framework, in conjunction with a V₂O₃/Ni heterostructure to serve as an efficient sulfur host. The material integrates high conductivity, exceptional adsorption capacity, and robust catalytic activity, which effectively promotes the catalytic conversion of lithium polysulfides (LiPSs) and enhances the kinetics of redox reaction. Consequently, the V₂O₃/Ni-CNTs-S cathode successfully completed 500 charge-discharge cycles at 1.0 C, exhibiting an impressively low capacity decay rate of only 0.062% per cycle. Moreover, at a high sulfur loading of 5.0 mg cm^-2, the cathode retains a specific capacity of 733 mAh g^-1 after 100 cycles at 0.2 C.