【摘 要】
：
Lithium-sulfur(Li-S)batteries are considered as one of the promising next-generation energy storage sys-tems because of their high energy density.While the low utilization of sulfur and sluggish reaction kinet-ics would lead to degradation of electrochemi
【机 构】
：
School of Materials Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Function
论文部分内容阅读
Lithium-sulfur(Li-S)batteries are considered as one of the promising next-generation energy storage sys-tems because of their high energy density.While the low utilization of sulfur and sluggish reaction kinet-ics would lead to degradation of electrochemical performance and thus hinder the practical application of Li-S batteries.Herein,a double-shelled TiO2-graphene heterostructure(H-TiO2/rGO)with abundant oxy-gen vacancies(OVs)and highly exposed active plane as advanced host material in Li-S batteries is designed.This rational structure not only provides sufficient active sites and lower bandgap for lithium polysulfides(LiPSs),but also builds smooth adsorption-diffusion-conversion of LiPSs on catalyst,which greatly reduces interfacial energy barrier and promotes the utilization of sulfur through suppressing the devastating shuttling effect.Combining the synergetic merits of strong anchoring ability and catalyz-ing the of LiPSs,the electrode(S-TiO2/rGO-1)exhibits superior rate performance and long lifespan(1000 cycles at 1C,0.023％capacity loss per cycle)with high columbic efficiency.This work paves an alternative way to establish smooth adsorption-diffusion-conversion of polysulfides on catalyst in Li-S batteries and provides a new sight to understand catalyst design in energy storage devices.
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