Hierarchical MoS₂@N‐Doped Carbon Hollow Spheres with Enhanced Performance in Sodium Dual‐Ion Batteries

Abstract

Abstract Sodium dual‐ion batteries (S‐DIBs) are attracting increasing interest in large‐scale electrical energy storage, owing to low‐cost and abundant sodium resources and the crucial need to develop high‐performance anode materials to spur the large‐scale application of S‐DIBs. In this work, hierarchical hollow spheres assembled from interconnected few‐layer MoS 2 nanosheets with an N‐doped carbon coating (designated as MoS 2 @NC HHSs) are designed and synthesized. An S‐DIBs full cell is fabricated with MoS 2 @NC HHSs as the anode, expanded graphite as the cathode, and 1.0 M NaPF 6 in EC/DMC/EMC (1 : 1 : 1, volume ratio) as the electrolyte. The combined effects rendered by the ultrathin MoS 2 subunits, hollow interior, and N‐doped carbon coating not only promote the reaction kinetics and capacitive‐controlled Na storage, but also guarantee outstanding mechanical stability during Na + intercalation/deintercalation. The MoS 2 @NC HHSs‐based S‐DIBs deliver a high reversible capacity of 45 mAhg −1 at 2 Ag −1 and exhibit good cycling performance with a stable reversible capacity of 40 mAhg −1 and high coulombic efficiency beyond 90 % at 1 Ag −1 for 500 cycles. The MoS 2 @NC HHSs have great potential in high‐performance S‐DIBs.