Lithium-sulfur(Li-S)battery,as an emerging rechargeable energy-storage system,sparks intensive research enthusiasm owing to its high theoretical energy density.However,the sulfur cathode undergoes the low coulombic ef...Lithium-sulfur(Li-S)battery,as an emerging rechargeable energy-storage system,sparks intensive research enthusiasm owing to its high theoretical energy density.However,the sulfur cathode undergoes the low coulombic efficiency,poor rate and cycling performance,caused by the polysulfides shuttle,low conductivity and sluggish redox kinetics.To address the above issues,various hybrid sulfur cathodes are developed based on two-dimensional(2D)materials.Recently,2D transition metal carbides and nitrides(MXenes)are receiving intensive interest as matrix materials for sulfur cathodes owing to their favorable properties,such as superior electrical conductivity,abundant active sites and adjustable surface functional groups.In this review,we mainly summarize the development of novel hybrid sulfur cathodes by taking advantage of unique properties of MXenes.The different roles MXenes played in sulfur cathodes,including facilitating the electron transfer,tuning the adsorption of polysulfides and catalyzing polysulfides conversion,are well discussed.Finally,we propose the future strategies on the rational design of MXene-based sulfur cathodes with high performances.展开更多
基金This work was financially supported by the National Key R&D Program of China(Grant No.2018YFB0104200).
文摘Lithium-sulfur(Li-S)battery,as an emerging rechargeable energy-storage system,sparks intensive research enthusiasm owing to its high theoretical energy density.However,the sulfur cathode undergoes the low coulombic efficiency,poor rate and cycling performance,caused by the polysulfides shuttle,low conductivity and sluggish redox kinetics.To address the above issues,various hybrid sulfur cathodes are developed based on two-dimensional(2D)materials.Recently,2D transition metal carbides and nitrides(MXenes)are receiving intensive interest as matrix materials for sulfur cathodes owing to their favorable properties,such as superior electrical conductivity,abundant active sites and adjustable surface functional groups.In this review,we mainly summarize the development of novel hybrid sulfur cathodes by taking advantage of unique properties of MXenes.The different roles MXenes played in sulfur cathodes,including facilitating the electron transfer,tuning the adsorption of polysulfides and catalyzing polysulfides conversion,are well discussed.Finally,we propose the future strategies on the rational design of MXene-based sulfur cathodes with high performances.
