Heterogeneous MoS 2 Nanosheets on Porous TiO 2 Nanofibers toward Fast and Reversible Sodium-Ion Storage.

2D layered molybdenum disulfide (MoS 2 ) has garnered considerable attention as an attractive electrode material in sodium-ion batteries (SIBs), but sluggish mass transfer kinetic and capacity fading make it suffer from inferior cycle capability. Herein, hierarchical MoS 2 nanosheets decorated porous TiO 2 nanofibers (MoS 2 NSs@TiO 2 NFs) with rich oxygen vacancies are engineered by microemulsion electrospinning method and subsequent hydrothermal/heat treatment. The MoS 2 NSs@TiO 2 NFs improves ion/electron transport kinetic and long-term cycling performance through distinctive porous structure and heterogeneous component. Consequently, the electrode exhibits excellent long-term Na storage capacity (298.4 mAh g -1 at 5 A g -1 over 1100 cycles and 235.6 mAh g -1 at 10 A g -1 over 7200 cycles). Employing Na 3 V 2 (PO 4 ) 3 as cathode, the full cell maintains a desirable capacity of 269.6 mAh g -1 over 700 cycles at 1.0 A g -1 . The stepwise intercalation-conversion and insertion/extraction endows outstanding Na + storage performance, which yields valuable insight into the advancement of fast-charging and long-cycle life SIBs anode materials.