Drastically Promoting Rate Capability via Dual-Cations Intercalation of V 2 O 5 Enabling Rapid Zinc-Ion Storage

Layered vanadium pentoxide (V O ) has drawn enormous attention as cathode material for aqueous zinc-ion batteries (AZIBs). However, the fragile open-framework and the sluggish Zn migration due to the strong electrostatic interaction between Zn and cathode electrode hinder the development of AZIBs. Here, an effective dual-cations intercalation strategy is employed based on synergistic effect of Mn and Zn , which introduces guest species with robust layered construction and weak electrostatic interaction in the V O bulk. Consequently, the (Mn Zn )V O (abbreviated to MZVO) electrode exhibits a high reversible capacity of 463 mA h g at 0.1 A g , a high cycling stability (94% of capacity retention after 1000 cycles at 10 A g ) and superior rate performance of 256 mAh g at 20 A g . The outstanding performance of MZVO cathode is attributed to the Mn -induced fast migration of Zn transfer and Zn -induced high structural stability conducted by density functional theory (DFT) calculations. The two-phase reaction mechanism of MZVO during Zn (de)interaction is systematically expounded via operando XRD. This study will provide reference for the design of modified layered metal oxides in the future.