the development of conversion-typed anodes with ultrafast charging and large energy storage is quite challenging due to the sluggish ions/electrons transfer kinetics in bulk materials and fracture of the active materials. herein, the design of porous carbon nanofibers/sns2 composite (sns2@n-hpcnfs) for high-rate energy storage, where the ultrathin sns2 nanosheets are nanoconfined in n-doped carbon nanofibers with tunable void spaces, is reported. the highly interconnected carbon nanofibers in three-dimensional (3d) architecture provide a fast electron transfer pathway and alleviate the volume expansion of sns2, while their hierarchical porous structure facilitates rapid ion diffusion. specifically, the anode delivers a remarkable specific capacity of 1935.50 mah g−1 at 0.1 c and excellent rate capability up to 30 c with a specific capacity of 289.60 mah g−1. meanwhile, at a high rate of 20 c, the electrode displays a high capacity retention of 84% after 3000 cycles and a long cycle life of 10 000 cycles. this work provides a deep insight into the construction of electrodes with high ionic/electronic conductivity for fast-charging energy storage devices.
