Vanadium based carbide–oxide heterogeneous V₂O₅@V₂C nanotube arrays for high-rate and long-life lithium–sulfur batteries

Abstract

Due to its ultra-high theoretical energy density, low cost, and environmental friendliness, lithium-sulfur batteries have become a potentially strong competitor for next-generation energy storage devices. Looking for a host material...

Interspersing Partially Oxidized V2C Nanosheets and Carbon Nanotubes toward Multifunctional Polysulfide Barriers for High-Performance Lithium-Sulfur Batteries

“…The XPS spectra of the obtained V 2 C/V 2 O 5 /CNTs are displayed in Figure b–d. The V 2p spectrum reveals the characteristic peaks of V 5+ species in V 2 O 5 at 517.5 (2p 3/2 ) and 525.0 (2p 1/2 ) eV as well as V 4+ species in V 2 C at 516.6 (2p 3/2 ) and 524.2 (2p 1/2 ) eV . The C 1s spectrum shows the subpeaks for C–C, C–O, CO, and O–CO bonds within 284–290 eV, while notably, a small peak can be perceived at 282.8 eV corresponding to the V–C bonding in V 2 C .…”

Progress and Opportunities of Vanadium-Based Compounds as Cathode Hosts, Decoration Layers of Separators, and Interlayers in Lithium Sulfur Batteries

“…Further, they also added hydrochloric acid to the solution to adjust the pH, which is conducive to the uniform nucleation of S particles on the matrix. Wang et al 73 have simultaneously dispersed the V 2 O 5 @V 2 C and S in the ethanol, where the S is uniformly loaded on the surface of V 2 O 5 @V 2 C nanotubes.…”

“…Wang et al 70 reported that in the VO 2 (p)-V 2 C host, the constitution of VO 2 (p) and V 2 C as well as the unique morphology collectively ensure that the VO 2 (p)-V 2 C/S cathode shows a 69.1% capacity retention at 2 C after 500 cycles. Wang et al 73 introduced that the MX-VPNAs host can show a synergistic effect of the excellent catalytic ability of V 2 O 5 , high carrier mobility of V 2 C, and long-term stable adsorption of V 2 O 5 @V 2 C with a high structural stability to LiPSs. Thus, the V 2 O 5 @V 2 C/S cathode exhibits a first capacity of 1173 mAh•g −1 at 0.2 C and a cycle decay of 0.047% for 1000 times.…”

“…Wang et al 70 reported paramontroseite-VO 2 (VO 2 (p)) nanorods grow on V 2 C (MXene) nanosheets as a host for the S cathode, where the areal S loading of 3.5 mg/cm 2 can be achieved (Figure 12B). Wang et al 73 prepared a vertically grown V 2 O 5 nanotube array on V 2 C nanosheets (MX-VPNAs) by a liquid−solid phase reaction method to work as a host material, where 8.4 mg/cm 2 S are supported. Song et al 69 presented an in-situ constructional VO 2 −VN binary host consisting of a uniform nanobelt shape with micron-sized length, where 13.2 mg/cm 2 S are supported.…”

ZnS nanolayer coated hollow carbon spheres with enhanced rate and cycling performance for Li-S batteries

“…Firstly, the electrons from the fracture of S 8 ring combines with lithium ions to form the soluble high-order polysulfide Li 2 S n (4≤n≤8) in the electrolyte. Subsequently, this longchain polysulfide converts to non-soluble short-chain polysulfide Li 2 S 2 /Li 2 S [11,12]. Meanwhile, the Li 2 S n dissolves in the electrolyte and diffuses to the anode side, and probably combines with lithium ions on the anode to form solid Li 2 S 2 /Li 2 S [13,14].…”