Mixed-dimensional V₂CT_x/Ti₃C₂T_x composite interlayer to boost electrochemical performance of Li-S batteries

A mixed-dimensional V₂CT_x/Ti₃C₂T_x composite interlayer was successfully prepared to tackle severe polysulfide (LiPS) shuttling and sluggish sulfur redox kinetics for high-performance lithium-sulfur batteries. In the unique nanoarchitecture, two-dimensional Ti₃C₂T_x nanosheets served as a stable skeleton with superb electronic conductivity, good mechanical strength, and high polysulfide adsorption, whereas one-dimensional V₂CT_x nanorods played a crucial role in chemisorbing LiPSs and catalyzing the conversion of LiPSs due to their high polarity and electrocatalysis. With the synergistic effect of V₂CT_x and Ti₃C₂T_x composite nanostructures, the cells with the mixed-dimensional V₂CT_x/Ti₃C₂T_x composite interlayer showed an impressive long-term cycling stability and small capacity decay rate of 0.062% per cycle over 600 cycles at 1 C and exhibited an outstanding rate capability of 935.3 mAh·g^-1 at 2 C.