BiSbS@N-doped carbon core-shell nanorods as efficient anode materials for sodium-ion batteries.

BiSbS3@N-doped carbon (NC) core-shell nanorods were prepared through a simple preparation process. As anode materials for sodium-ion batteries (SIBs), BiSbS3@NC core-shell nanorods present excellent electrochemical performance with higher specific capacity and better rate capability compared with the unmodified pristine BiSbS3 nanorods. The BiSbS3@NC electrode delivers high sodium storage capacity (771.5 mA h g-1 in the 2nd cycle) and excellent rate performance (capacity of 518.4 mA h g-1 at 1000 mA g-1). The improvement in electrochemical performance results from the coated conductive NC layer which brings about fast ion/electron transfer and buffers volume expansion. The BiSbS3@NC core-shell nanorods are thus promising high performance anode materials for SIBs.