Interwoven V₂O₅ nanowire/graphene nanoscroll hybrid assembled as efficient polysulfide-trapping-conversion interlayer for long-life lithium–sulfur batteries

Abstract

An advanced lithium–sulfur battery interlayer configuration has been developed by engineering a lightweight, self-standing, and flexible hybrid film assembled from interwoven 1D V2O5 nanowires and graphene nanoscrolls.

A New Finding on the Enhancement of the Ability of Polysulfide Adsorption of V2O5 by Doping Tungsten in Lithium–Sulfur Batteries

“…The peak positions are 517.2 eV (V 5+ ) and 516.0 eV (V 4+ ), respectively. Compared with the XPS spectrum before the adsorption test, it can be seen that the content of V 4+ is significantly higher (the content of V 4+ on the surface of V 2 O 5 increased from 5% to 22%), which indicates that some V 5+ is reduced to V 4+ , which is consistent with the literature report …”

“…It can be seen that the thickness of the V 2 O 5 ‐G/CNT and W‐V 2 O 5 ‐G/CNT modified layers is about 15 µm (Figure a,c), and the rod‐shaped nanometal oxide and the G/CNT are uniformly distributed (Figure b,d). G/CNT can be used as an excellent 3D conductive framework to provide an electrochemical reaction site for LiPS dissolved in the electrolyte, providing an electron path for LiPS adsorbed on the metal oxide …”

Rational Construction of V2O5@rGO with Enhanced Pseudocapacitive Storage for High‐Performance Flexible Energy Storage Device

“…Additionally, the bands at 1731 and 1028 cm −1 are attributed to the C=C and C−O skeletal vibration of rGO . The Raman spectra in Figure c was employed to further validate the information on the microstructure of VrG‐5 sample, the characteristic D and G bands at around 1349 and 1585 cm −1 are corresponded to sp 3 ‐type disordered carbon and sp 2 ‐type ordered graphitic carbon, respectively . Notably, the peaks appearing at 994 and 286 cm −1 are attributed to the terminal oxygen stretching mode V=O, meanwhile, these peaks at around 701, 528 and 139 cm −1 can be ascribed to the double coordinated oxygen stretching mode V−O−V, the triply coordinated oxygen V 3 −O and the in‐phase stretching vibration V−O, respectively, are belonged to orthorhombic V 2 O 5 .…”

2D/1D V2O5 Nanoplates Anchored Carbon Nanofibers as Efficient Separator Interlayer for Highly Stable Lithium–Sulfur Battery

“…Other compounds, like CoS 2 [24], MoO 3 [25], and CoP [26], can both catalyze the electrochemical conversion of the polysulfides and adsorb them, which are attractive for polysulfide immobilizing in both cathode and separator parts. Quite recently, insertion of membranes (or the so-called interlayers) between the separator and cathode has been demonstrated as a simple and promising approach to alleviate these issues [27,28]. First, the functional layer can serve as a physical barrier to intercept the migration of the soluble LiPSs to the anode side.…”