2D Mesoporous Nanomesh from N-Doped Carbon-Encapsulated V₂O₃ Nanowires as an Anode for Lithium-Ion Batteries

Abstract

Vanadium (III) oxide nanomaterials have been investigated and considered as potential anode materials for Li-ion batteries (LIBs). Fabrication of two-dimensional (2D) mesoporous nanomeshes from carbon-encapsulated V2O3, though is technically challenging, can further enhance its electrochemical performances due to the shortening of the Li+-ion diffusion distance, the highly conductive pathway for electrons, and the tremendous increase of surface areas. In this paper, an ice-templated assembly approach is utilized to fabricate a 2D mesoporous nanomesh from N-doped carbon-encapsulated V2O3 (V2O3@N-C Nm). The V2O3@N-C Nm anode exhibits a highly reversible capacity of ∼651 mA h g–1 at a current density of 200 mA g–1 over 100 cycles, which is 2.5 times and 1.3 times higher than those of V2O3 Nm and V2O3@N-C nanocomposite (V2O3@N-C Nc), respectively. The superior electrochemical performances of V2O3@N-C Nm are mainly due to its unique nanomesh nanostructure, which facilitates the lithiation/delithiation process, alleviates structural collapse, enhances electrical conductivity, and provides efficient diffusion channels.

Stabilizing V2O3 in carbon nanofiber flexible films for ultrastable potassium storage

“…4a shows the cyclic voltammetry (CV) profiles of the V 2 O 3 /CNF film electrode for the initial three cycles at a scanning rate of 0.1 mV s −1 and a voltage range of 0.01-3.0 V. In the curves of the initial cathodic sweep, a strong reduction peak at 0.59 V, which disappears in the following cycles, is attributed to the decomposition of the electrolyte and the formation of solid electrolyte interphase layers on the surface of the electrode. 37,69 The peaks appear at 0.98 V in the following cycles and the oxidation peaks appear at about 1.23 V in the anodic process and are related to the reversible potassium-ion transmission, marking the superior potassium storage of the V 2 O 3 /CNF film electrode. 55,56 The CV curves in the subsequent cycles are almost overlapped, indicat- ing the favorable reversibility of the V 2 O 3 /CNF film electrode.…”

Facilely Fabricating V2O3@C Nanosheets Grown on rGO as High-Performance Negative Materials for Lithium-Ion Batteries by Adjusting Surface Tension

“…Table contrasts the lithium storage performance of the V 2 O 3 @C/rGO negative material to former studies on V 2 O 3 -based negative materials. It is clear that V 2 O 3 @C/rGO exhibits larger reversible capacity, preferable rate performance, and cyclic stability than most V 2 O 3 -based materials, such as V 2 O 3 /PNCN, V 2 O 3 /C microspheres, NC@V 2 O 3 , V 2 O 3 /C composite, V 2 O 3 @N-C Nm, and V 2 O 3 @NC NANF . The large reversible capacity and superior rate capability of the V 2 O 3 @C/rGO sample likely stem from its particular microstructure: (i) the outstanding electrical conductivity of the rGO substrate makes it easy to accelerate the electron transfer rate; (ii) V 2 O 3 @C nanosheets grown on the flexible rGO support could evidently decrease the diffusion distance of Li + and relieve aggregation and pulverization; and (iii) obvious chemical interactions between V 2 O 3 nanosheets and rGO could further elevate charge transfer in the cyclic process.…”

An invisible hand: Hydrogen bonding guided synthesis of ultrathin two-dimensional amorphous TiO2 nanosheets

“…At a current rate of 0.1 A g −1 , the first charge and discharge specific capacities of a-TiO 2 are 590 and 740 mA h g -1 , respectively. During the first cycle, as the irreversible SEI film is generated and the electrolyte is decomposed, the specific capacities decrease [56]. In addition, from the 1st to 10th cycles, no obvious plateau was observed for both discharge and charge curves of a-TiO 2 and the potential slightly dropped during the lithium insertion/desertion process.…”