BiSbS3@N-doped carbon core–shell nanorods as efficient anode materials for sodium-ion batteries

Abstract

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 2^nd 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.