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With severe stress from energy crisis and global environmental concerns,lithium-ion batteries(LIBs)have attracted extensive attention as power sources for electric vehicles due to their high energy density,low gravimetric density,long cycle life,and flexible design.1 As a typical two-dimensional transition-metal sulfide,MoS2 shows analogous layered structure of graphene in which molybdenum atoms are sandwiched between two layers of sulfur atoms via weak van der Waals interactions,thus giving rise to wide interlayer spaces that allow facile insertion and extraction of Li+ions during charge/discharge processes to achieve high specific capacity for LIBs.2-5 However,MoS2 nanostructures suffer from severe restacking and condensation during charge/discharge processes due to the high surface energy,interlayer van der Waals attraction and poor conductivity,which results in drastically reduced accessibility of electrolyte and fast capacity fading in practical applications.6,7 Therefore,self-standing membranes of porous carbon nanofiber(PCNF)@MoS2 core/sheath fibers have been facilely obtained in this work through the combination of electrospinning and solvothermal reaction(Figure 1).