Enhanced Kinetics over VS₄ Microspheres with Multidimensional Na⁺ Transfer Channels for High‐Rate Na‐Ion Battery Anodes

Abstract

Developing 3 D self‐assembled nanoarchitectures with well‐defined crystal structures is an effective strategy to enhance the electrochemical performances of electrode materials. (1 1 0)‐oriented and bridged‐nanoblocks self‐assembled VS4 microspheres are controllably synthesized by a facile one‐step hydrothermal method. The (1 1 0)‐bridged structure sets up open pathways for Na+ diffusion among nanoblocks, and the (1 1 0)‐oriented structure provides unobstructed pathways for Na+ diffusion in the nanoblocks, which collectively constructs multidimensional Na+ transfer channels in the VS4 microspheres, promoting the electrochemical kinetics. As an anode for Na‐ion batteries (SIBs), this material exhibits pseudocapacitive Na+ storage and excellent rate capability, delivering high capacities of 339 and 270 mAh g−1 at rates of 0.1 and 2.0 A g−1, respectively, with a capacity retention of 79 % in the voltage window of 0.5–3.0 V. In particular, the reversible capacity reaches 575 mAh g−1 after 300 cycles even at 1.0 A g−1 in the voltage window of 0.05–3.0 V, outperforming those of the ever‐reported VS4‐based anode materials. This work presents an effective strategy to the exploration and design of high‐performance anodes for SIBs.

Self‐Assembled VS4 Hierarchitectures with Enhanced Capacity and Stability for Sodium Storage

“…From Figure 1c, it can be seen that there are 2 pairs of peaks, with the ones at 516.2 and 523.6 eV attributed to V 4+ while the pair at 513.5 and 521.1 eV ascribed to V 3+ . [ 30 ] The presence of V 3+ indicates that there is a planar interaction force between the curly VS 4 nanosheets. The S 2p 1/2 peak at 163.6 eV and the S 2p 3/2 peak at 162.4 eV are assigned to and confirm the formation of VS 4 (Figure 1d).…”

Vanadium Tetrasulfide for Next‐Generation Rechargeable Batteries: Advances and Challenges

“…Li and co-workers further constructed two types of VS 4 microspheres. [100,101] One was VS 4 microspheres wound with (1 1 0)-oriented nanotubes (NTÀ VS 4, ) and the other was VS 4 microspheres with (110)oriented and bridged nanoblocks (SBÀ VS 4 ). On this basis, Li and co-workers successfully synthesized (1 1 0)-bridges nanoblocks to accommodate VS 4 hollow microspheres (PNBHÀ VS 4 ) and systematically investigated their electrochemical properties as SIB anodes.…”

“…The conspicuous Na + storage capability of the nanorod‐VS 4 was primarily attributed to the synergistic effect of the radial nanorod self‐assembled structures and their selective growth along the (110) plane. Li and co‐workers further constructed two types of VS 4 microspheres [100,101] . One was VS 4 microspheres wound with (1 1 0)‐oriented nanotubes (NT−VS 4, ) and the other was VS 4 microspheres with (110)‐oriented and bridged nanoblocks (SB−VS 4 ).…”

Active Sulfur-Host Material VS4 with Surface Defect Engineering: Intercalation-Conversion Hybrid Cathode Boosting Electrochemical Performance of Li–S Batteries

“…Graphene with excellent conductivity can improve the conductivity of the cathode and accelerate the electron transportation during the discharge/charge process. Meanwhile, vanadium tetrasulfide (VS 4 ), as a novel material for energy storage, has been widely applied in lithium-ion batteries and sodium-ion batteries. − VS 4 is the one-dimensional chain conductive composite in which different V 4+ (S 2 2– ) 2 chains are used for trapping polar LiPSs via van der Waals forces . When the VS 4 -based composites are utilized as polysulfide-trapping-conversion mediators for Li–S batteries, the polar LiPSs can be trapped by polar V 4+ (S 2 2– ) 2 chains through van der Waals forces. , Furthermore, doping heteroatoms into transition-metal compounds is a viable strategy to obtain stronger conductivity and catalytic ability, where the Co element has been studied as an excellent heteroatom catalyst. ,− …”