Sb2S3 nanocrystals embedded in multichannel N-doped carbon nanofiber for ultralong cycle life sodium-ion batteries.

Sodium-ion batteries with potentially low cost is an alternative to lithium-ion batteries for large-scale energy storage. However, developing high energy density and ultralong cycle life electrodes for sodium-ion batteries is a key issue due to the larger radius of Na+ than Li+ and the sluggish sodium intercalation kinetics. One-step electrospinning process has been applied to synthesis Sb 2 S 3 nanocrystals hosted in multichannel porous N-doped carbon nanofiber (CNF). Sb 2 S 3 nanoparticles with diameter of 10–50 nm were uniformly embedded in CNF, while the multichannel pores of CNF act as a buffer to restrict the volume expansion of Sb 2 S 3 during cycling. Sb 2 S 3 @N-doped carbon nanofiber (Sb 2 S 3 @CNF) delivered a specific capacity of 311 mAh g−1 at 100 mA g−1 with a capacity retention of 87% after 1000 cycles at 1A g−1, corresponding to a capacity decay rate of only 0.013% per cycle. Benefited from the unique multichannel mesoporous structure, charge storage of Sb 2 S 3 @CNF is mainly contributed by a surface capacitive process indicating significantly enhanced mass diffusion properties. The as-developed nanofibers with a cylindrical porous structure by a one-step electrospinning method can be an excellent host for electroactive materials to achieve ultralong cycle life. A one-step electrospinning process has been applied to synthesis multichannel porous N-doped carbon nanofibers (CNF) hosted with Sb 2 S 3 nanocrystals. Sb 2 S 3 @CNF delivered an ultralong cycle life with a capacity retention of 87% after 1000 cycles at 1A g−1. Image 1 • Sb 2 S 3 nanocrystals (10–50 nm) embedded in multichannel CNF (Sb 2 S 3 @CNF) have been fabricated by one-step electrospinning. • Mesoporous CNF has multichannel cylindrical pores with diameter of ~10 nm. • The cylindrical mesopores of CNF effectively buffer the volumetric change of Sb 2 S 3 and lead to ultralong cycle stability. • Sb 2 S 3 @CNF has a capacity retention of 89.1% after 1000 cycles, significantly higher than that of Sb 2 S 3 @C (56.3%) and Sb 2 S 3 powder (21.3%). [ABSTRACT FROM AUTHOR]