Capture and accelerated conversion mechanism of polysulfides by CNTs-CNFs interlayer in lithium-sulfur batteries
In order to effectively suppress the shuttle effect of lithium polysulfides(LiPSs),carbon nanotubes(CNTs)were vertically grown on carbon nanofibers(CNFs)by electrospinning,electrochemical deposition and chemical va-por growth techniques.An ultra-thin,lightweight multi-functional three-dimensional cross-linked carbon nanofibers-carbon nanotubes(CNTs-CNFs)interlayer was developed to study the effect of CNTs-CNFs on the electrochemical properties of lithium-sulfur batteries(LSBs).The research results indicate that the excellent conductivity and abundant pore structure of CNTs-CNFs film provide uniform conductive network for LSBs and adsorption filtration barrier for LiPSs.Compared with the battery without interlayer,the battery with CNTs-CNFs interlayer has better capacity retention and cycle stability.It has an initial specific discharge capacity of 1 296.7 mA·h/g at a current density of 0.2 C,and can still provide a specific discharge capacity of 864.7 mA·h/g after 100 cycles,and the capacity retention rate is 66.68%.