High-performance Na2Ti2O5 nanowire arrays coated with VS2 nanosheets for sodium-ion storage

Abstract

Cite this article as: Jin-Yun Liao and Arumugam Manthiram, High-performance Na 2 Ti 2 O 5 Nanowire Arrays Coated with VS 2 Nanosheets for Sodium-ion Storage, Nano Energy, http://dx. AbstractNa 2 Ti 2 O 5 (NTO) nanowire arrays coated with VS 2 nanosheets (NTO-VS 2 ) have been directly prepared on a current collector as a 3D anode for Na-ion batteries.Compared to graphite, the larger interlayer spacing of two dimensional VS 2 can offer facile intercalation of lithium and/or sodium ions. Aside from its natural metallic behavior, VS 2 also possesses a high theoretical capacity. The composite NTO-VS 2 nanowire arrays as an additive free 3D anode shows superior electrochemical performance compared to NTO. After 50 (C/10) and 100 (1C) cycles, the charge capacities of NTO-VS 2 are maintained, respectively, at 298 and 203 mA h g -1 , which are much higher than the values of 157 and 93 mA h g -1 observed for the same cycled Na 2 Ti 2 O 5 electrode. The higher capacity, improved rate capability, and good stability of the composite NTO-VS 2 nanowire arrays are due to the structural stability of the Na 2 Ti 2 O 5 nanowire arrays and the higher capacity and conductivity of the two-dimensional VS 2 nanosheets.

Porous One‐Dimensional Nanomaterials: Design, Fabrication and Applications in Electrochemical Energy Storage

“…The reversible capacity of the as-prepared electrode ranged from 153 to 72 mAh g −1 at relatively large specific currents of 1 and 10 A g −1 , respectively (Figure 19a). Several Ti-based porous 1D nanostructures have been investigated for SIBs, including TiO 2 nanotubes, [227] Na 2 Ti 3 O 7 nanotubes, [228] Na 2 Ti 7 O 15 nanotubes, [229] MgTi 2 O 5 /C nanorods, [230] and Na 2 Ti 2 O 5 /VS 2 heterostructures [231] among others. Mater.…”

Hollow Structure VS2@Reduced Graphene Oxide (RGO) Architecture for Enhanced Sodium‐Ion Battery Performance

“…Cyclic voltammetry curves of VS 2 HFS and VS 2 HFS/RGO nanocomposites for the first three cycles were measured at a scan rate of 0.1 mV/s in the voltage window of 0.1–2.5 V at room temperature, as shown in Figure a–b. The CV profiles of VS 2 HFS are quite weak, while a cathodic peak at 0.88 V was observed during the first negative cycle (vs. Na/Na + ), corresponding to the Na ions intercalation process and the conversion reaction of the layered VS 2 . In addition, from the CV curves of VS 2 HFS/RGO nanocomposites, two obvious peaks appeared around 1.03 V and 0.35 V at the initial cathodic scan, which were ascribed to the decomposition of the electrolyte and the formation of an irreversible solid electrolyte interphase (SEI) film .…”

“…The CV profiles of VS 2 HFS are quite weak, while a cathodic peak at 0.88 V was observed during the first negative cycle (vs. Na/Na + ), corresponding to the Na ions intercalation process and the conversion reaction of the layered VS 2 . [45] In addition, from the CV curves of VS 2 HFS/ RGO nanocomposites, two obvious peaks appeared around 1.03 V and 0.35 V at the initial cathodic scan, which were ascribed to the decomposition of the electrolyte and the formation of an irreversible solid electrolyte interphase (SEI) film. [46] The broad anodic peak at 1.39 V in all the cycles represented the desodation process of the nanocomposite.…”

Vanadium Sulfide@Sulfur Composites as High‐Performance Cathode for Advanced Lithium–Sulfur Batteries

“…[32] Compared with other TMD-based materials, VS 2 has a 2D layered structure with an interlayer spacing of 5.76 Å, which is much larger than that of graphene. [33] VS 2 exhibits an intrinsic metallic behavior and its V layers and S layers are combined together by weak van der Waals interaction to form a three-layer structure of S-V-S. [34] Recently, VS 2 nanosheets have been prepared by chemical vapor deposition that demonstrate an excellent electrical conductivity of %3 Â 10 3 S cm À1 . [35] Their unique structure can inherently adapt to the insertion of guest ions into the layer spacing without causing severe structure deformation and allows for rapid ion transport.…”