Facile and Scalable Synthesis of 3D Structures of V₁₀O₂₄·12H₂O Nanosheets Coated with Carbon toward Ultrafast and Ultrastable Zinc Storage

Abstract

Three-dimensional (3D) structures of V10O24·12H2O nanosheets coated with carbon (denoted as V10O24@C) are facially and cost-effectively fabricated by reducing the V2O5-based aqueous solution with ethanol under hydrothermal conditions. By using the 3D V10O24@C as the cathode of zinc-ion batteries, the as-obtained 3D V10O24@C sample delivers excellent charge–discharge cycling capability, superior rate performance, and reasonable specific capacity, and a specific capacity of ca. 133.3 mA h g–1 and a 94.1% capacity retention are achieved even after 10000 cycles at a high current density of 10 A g–1 (∼80 C). Furthermore, it provides a facile and scalable approach to synthesize the 3D structures of pure-phased vanadium oxide nanosheets or other nanoscale metal oxides coated with carbon.

Poly(3,4-ethylenedioxythiophene)–Polystyrenesulfonate-Added Layered Vanadium Oxide Cathode for High-Performance Zinc-Ion Batteries

“…Furthermore, when stepwise resetting the current density back to 0.2 A g –1 , 97.0% of the initial capacity remains, thus indicating the good electrochemical reversibility . Moreover, our P-VO AZIB exhibits the superior charge storage performance to some reported AZIBs based on other cathode materials, as displayed in Figure f. ,,,,,, Here, it is worth noting that both the CC substrate and PEDOT:PSS have the neglectable capacity contribution to the total capacity as indicated by the CV measurement shown in Figure S7…”

“…51 Moreover, our P-VO AZIB exhibits the superior charge storage performance to some reported AZIBs based on other cathode materials, as displayed in Figure 2f. 11,25,31,35,45,48,52 Here, it is worth noting that both the CC substrate and PEDOT:PSS have the neglectable capacity contribution to the total capacity as indicated by the CV measurement shown in Figure S7. 53 The long-term durability of the electrode was evaluated under different current densities.…”

“…Therefore, vanadium oxides are a promising candidate due to their high capacity of ∼400 mAh g –1 , originating from the multivalence of vanadium (+3 to +5), and to the controllable layered structure beneficial for Zn 2+ intercalation/deintercalation. − In addition, the abundant reserve in the earth crust also endows vanadium oxides with the application superiority for AZIBs. Hydrated vanadium pentoxide (V 2 O 5 · n H 2 O) has a bilayer structure providing more reactive sites, and moreover the structural water molecules can expand the interlayer spacing. − More importantly, the shielding effect of the water molecules weakens the interaction between cations, thus facilitating Zn 2+ diffusion.…”

Recent Developments and Challenges of Vanadium Oxides (VxOy) Cathodes for Aqueous Zinc‐Ion Batteries

“…The self‐supporting design and the formation of hydrophilic surfaces/interfaces during the reaction process endowed the cathode with good cycling and rate performance. Zhang et al [113] . constructed 3D structured carbon‐coated V 10 O 24 ⋅ 12H 2 O nanosheets (V 10 O 24 @C) by reducing V 2 O 5 ‐based aqueous solutions with ethanol under hydrothermal conditions (Figure 14b).…”

“…(c) Rate performance of the 3D V 10 O 24 @C cathode. Reproduced with permission [113] . Copyright 2021, American Chemical Society.…”