Flexible and Self-Standing Urchinlike V₂O₃@Carbon Nanofibers toward Ultralong Cycle Lifespan Lithium-Ion Batteries

Abstract

In this study, V2O3@carbon nanofibers as flexible anode materials were synthesized via electrospinning. The electrode showed a specific discharge capacity with 495 mA h g–1 at 1000 mA g–1 after 1000 cycles. Surprisingly, the electrode fabricated from the V2O3@carbon nanofibers exhibited a specific capacity of 336 mA h g–1 at 5000 mA g–1. Even after 10,000 cycles, it still displayed a specific discharge capacity of 290 mA h g–1, indicating that it has outstanding capacity advantages and long-cycle lifespan. The large specific surface area and abundant active sites of urchinlike V2O3 were considered as the reasons for its outstanding electrochemical performance. The combination of V2O3 and the carbon nanofibers formed a complete conductive network that enhanced the conductivity of the sample, reduced the diffusion path of Li+, and eased the volume change during intercalation/deintercalation of Li+. These results not only demonstrated that the flexible V2O3@carbon nanofibers prepared herein have broad application prospects as an anode for LIBs but also offer a processing strategy for fabricating other state-of-the-art flexible electrode materials for energy storage systems.

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

“…Figure b exhibits the discharge–charge potential charts of the V 2 O 3 @C/rGO anode at different cycles under 100 mA g –1 current density. We can conclude that its voltage platforms are consistent with the voltage platforms of typical V 2 O 3 electrode materials . The first discharge capacity and corresponding charge capacity of the V 2 O 3 @C/rGO anode are 1075 and 757 mA h g –1 , respectively.…”

“…We can conclude that its voltage platforms are consistent with the voltage platforms of typical V 2 O 3 electrode materials. 39 The first discharge capacity and corresponding charge capacity of the V 2 O 3 @C/rGO anode are 1075 and 757 mA h g −1 , respectively. We can calculate the first Coulombic efficiency to be up to 70%, higher than those of most reported V 2 O 3 electrode materials.…”

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

“…The full spectrum shows that sharp and obvious characteristic peaks of V 2p, O 1s, and C 1s correspond to the result of element mapping (Figure a). Figure b displays the OC–O, C–O, and C–C bonds located at 288.7, 286.3, and 284.6 eV in the spectrum of C 1s. , There are three typical peaks at 532.4 eV (C–O), 531.5 eV (CO), and 530.3 eV (V–O) bonds in the spectrum of O 1s (Figure c). ,, Figure d shows the detailed spectrum of V 2p. There are two peaks located at 516.4 and 523.6 eV corresponding to V 2p 1/2 and V 2p 3/2 of V 3+ .…”

“…Figure 4b 4c). 18,39,40 Figure 4d shows the detailed spectrum of V 2p. There are two peaks located at 516.4 and 523.6 eV corresponding to V 2p 1/2 and V 2p 3/2 of V 3+ .…”

A Pyramidal Metal–Organic Frameworks‐Derived FeP@CoP Aluminium‐Ion Battery Cathode Displaying Low‐Temperature Tolerance and Fast Electron Transfer Kinetics

“…The oxidation b values are 0.604, 1.115, and 0.734; and the reduction one is 0.627, implying both diffusive and capacitive behaviors. The capacitance contribution and diffusion contribution are shown asi [31] In Figure 4b, capacitance contribution increases as scaning rate elevates. For comparison, CV curves analysis and contribution ratio of FeP cathode are shown in Figure S13.…”