V₂O₃ Nanoparticles Anchored on an Interconnected Carbon Nanosheet Network Toward High-Performance Sodium-Ion Batteries

Abstract

Designing the multidimensional nanomaterial hybrid composite electrode is an effective approach to improve the electrochemical conductivity, structural stability, and Na-ion storage capacity of the anode for sodium-ion batteries. Herein, through solvothermal reaction and subsequent calcination, the V 2 O 3 /C nanocomposite is synthesized which served as a capable Na-ion host. Zero-dimensional V 2 O 3 nanoparticles are in situ generated on a two-dimensional carbon layer to constitute a firm structure with high electrical conductivity. The V 2 O 3 /C nanocomposite shows desirable cycle performance (216 mA h g −1 at 0.5 A g −1 after 1000 cycles) and remarkable rate ability (205 mA h g −1 at 2 A g −1 ). Meanwhile, the Na-ion storage mechanism indicates that the storage capacity is mainly dominated by the capacitance behavior, thus enhancing the rate ability and cycle performance. This work demonstrates the importance of constructing a nanocomposite on electrode materials and displays a viable approach to fabricate nanocomposite electrode materials for metal-ion batteries.

One-step Solid-State Synthesis of V1.13Se2/V2O3 Heterostructure as a High Pseudocapacitance Anode for Fast-Charging Sodium-Ion Batteries

“…This phenomenon can be attributed to the existence of the inherent electric field and the electron coupling interaction between V 1.13 Se 2 and V 2 O 3 . , Simultaneously, the heterointerface on the surface also partially weakens the further oxidation of the V 1.13 Se 2 /V 2 O 3 heterostructure, explaining the stronger Se–O peak at 58.9 eV for pure V 1.13 Se 2 in Figure d . The high-resolution O 1s spectrum of the V 1.13 Se 2 /V 2 O 3 heterostructure (Figure e) can be resolved into two distinct peaks situated at 530.3 and 532.3 eV, respectively, which correspond to the V–O bond of V 2 O 3 and the absorbed water, , further corroborating the successful synthesis of the V 1.13 Se 2 /V 2 O 3 heterostructure. Figures f and S3 depict the TG curves of the V 1.13 Se 2 /V 2 O 3 heterostructure under air and N 2 atmospheres.…”