摘要
The commercialization of lithium-sulfur(Li-S)batteries is significantly hindered by the severe shuttle effect of soluble lithium polysulfides(LiPSs)and the poor electrical conductivity of sulfur and its discharge products.To address these challenges,we designed and fabricated an integrated cathode material by decorating titanium nitride(TiN)nanorods(NDs)on three-dimensional(3D)interconnected carbon nanofibers(CNFs-TiN NDs)through a facile hydrothermal and electrospinning approach.The 3D porous network structure not only facilitates electrolyte infiltration and ion/electron transport but also provides ample space for sulfur accommodation.Moreover,the TiN nanorods serve a dual function:they effectively adsorb LiPSs to suppress the shuttle effect and enhance the conductivity of the electrode,thereby accelerating redox reaction kinetics and catalyzing the conversion of LiPSs into short-chain Li_(2)S.These mechanisms are further validated through density functional theory(DFT)calculations and comprehensive electrochemical analyses.Benefiting from these advantages,the CNFs-TiN NDs electrodes deliver outstanding electrochemical performance,including high discharge capacity,excellent rate capability,and remarkable cycling stability.This work provides a promising strategy for designing integrated electrocatalysts to achieve high-performance Li-S batteries.
基金
supported by the National Natural Science Foundation of China(No.52472110,U2004172,51972287)
the Central Plains Science and Technology Innovation Leading Talents(254000510052)
the National Natural Science Foundation of Henan Province(No.242300421008)
the Program for Science&Technology Innovation Talents in Universities of Henan Province(23HASTIT001).
