Li, Na co-stabilized vanadium oxide nanobelts with a bilayer structure for boosted zinc-ion storage performance

Addressing the structural instability and torpid kinetic limitation has been a pressing while challenging issue for vanadium oxide cathode materials to realize their outstanding performance in rechargeable aqueous zinc-ion batteries (ZIBs). Herein, vanadium oxide nanobelts with a bilayer structure (LiV 3 O 8 @NaV 3 O 8 , LVO@NVO) have been prepared successfully via a quick one-pot eutectic oxidation process. When evaluated as a cathode for ZIBs, the LVO@NVO shows an amazing capacity of 476 mA h g −1 at 0.05 A g −1 , superior rate properties (236 mA h g −1 @ 5 A g −1 ), and excellent cycling capability over 2000 cycles with a capacity-retention of 93.4%. Owing to the pre-intercalated Li + and Na + cations and the resulting bilayer structure, higher pseudocapacitance, faster charge-transfer/ion-diffusion kinetics, and a robust architecture have been achieved in the LVO@NVO cathode, which are responsible for the superior zinc-ion storage performance. Furthermore, the energy storage mechanism based on Zn 2+ and H + co-intercalation/extraction has been proved. Li + , Na + co-stabilized vanadium oxide nanobelts with a bilayer structure are prepared via a quick one-pot eutectic oxidation process. Faster charge-transfer/ion-diffusion kinetics and robust architecture lead to a superior zinc-ion storage performance.