Novel Polygonal Vanadium Oxide Nanoscrolls as Stable Cathode for Lithium Storage

Abstract

Scroll‐shape structures with adjustable space provide interlayer sliding to accommodate the volume changes, which are promising candidates for increasing the stability of lithium batteries (LBs). In this work, for the first time, novel vanadium oxide polygonal nanoscrolls (PNSs) are synthesized in solution through self‐rolling, Ostwald ripening, and scroll‐by‐scroll processes. The PNSs are of various shapes (including triangle, quadrangle, pentagon, and so forth) and spiral‐wrapped multiwall. When evaluated as cathode for LB, the vanadium oxide PNSs cathode exhibits largely enhanced cycling stability (capacity retention of 91.7% after 150 cycles at 0.1 A g–1 in 2.0–4.0 V) compared with those of nonscrolled nanobelts (40.0%) and nanowires (35.8%). Even at 1.0 A g–1, the PNSs cathode delivers high‐rate long‐life performance with capacity retention of 80.6% after 500 cycles. The unique polygonal nanoscroll structure is favorable for improving the cyclability and rate capability in energy storage applications as demonstrated here, and it will be interesting and has great potential for other related applications.

Gold nanorings synthesized via a stress-driven collapse and etching mechanism

“…A self-rolling or polymer-induced coiling mechanism has been observed to explain the formation of ZnO nanorings, Au and Ag nanosprings, InS rings and loops and V 3 O 7 nanoscrolls. [17][18][19][20] In addition, a structural transformation via an edge-selective reaction of two-dimensional (2D) layered nanocrystals or via a Kirkendall effect has been used to prepare TiO 2 toroids, Cu 2 S nanorings and Cu-NaInS 2 nanorings. [21][22][23] Recently, the self-assembly mechanism of NPs with intrinsic polygons led to the growth of ring-like CdS, Ni-Co and PbSe nanorings.…”

A High-Rate V2O5Hollow Microclew Cathode for an All-Vanadium-Based Lithium-Ion Full Cell

“…To minimize the surface energy, the nanowires undergo a crimping and self‐roll process, forming nanofibrous microclews with hollow cavities at the center . With the nanowires getting closer, the repulsion between the [NH 3 C(CH 3 OH) 3 ] + species absorbed on adjacent nanowires dominates, avoiding the further aggregation of the nanowires . After removing the organic species from the microclews during calcination, the structural integrity of the microclews can be well maintained, while pores or interstices can be formed between the nanowires.…”

Multidimensional Synergistic Nanoarchitecture Exhibiting Highly Stable and Ultrafast Sodium‐Ion Storage

“…The detailed assembly processes of V 2 O 3 ⊂C‐NTs⊂rGO are illustrated in Figure a. First, the VO x nanotubes (VO x ‐NTs) precursor were synthesized through the cetylamine‐assisted self‐scrolling method, producing NTs with diameters ranging from 100 to 200 nm, as shown by field‐emission scanning electron microscopy (SEM) (Figure b; Figure S1a, Supporting Information). The VO x ‐NTs modified with long hydrophobic alkyl chains of cetylamine were thoroughly dispersed in alcohol, and then an aqueous dispersion of graphene oxide (GO) nanosheets (GO‐NSs) was mixed in.…”