Anomalous Zn<sup>2+</sup> Storage Behavior in Dual‐Ion‐In‐Sequence Reconstructed Vanadium Oxides
Hanmei Jiang, Yifu Zhang, Moaz Waqar, Jin Yang, Yanyan Liu, Jingjing Sun, Ziyi Feng, Jianguo Sun, Zhenghui Pan, Changgong Meng, John Wang
Abstract
Abstract Vanadium oxides with fast and stable Zn 2+ storage are of great significance to the development of high‐performance aqueous zinc ion batteries (ZIBs), and yet they commonly suffer from structural instability and sluggish diffusion kinetics. Herein, a new “dual‐ion‐in‐sequence” intercalation strategy based on quenching is proposed to address these issues. Interestingly, it is found that the Zn 2+ storage mechanism evolves from the common solid‐state ion diffusion kinetic into an intercalation pseudocapacitance as a result of the enlarged interlayer spacing of V 2 O 5 . Together with the expanded interlayer spacing arising from the “dual‐ion‐in‐sequence” intercalation, oxygen defects are simultaneously generated at the sub‐surface of the reconstructed Li@MnVO materials. Benefitting from the improved ionic diffusivity, intercalation pseudocapacitance, and fast charge transferability, full cell based on Li@MnVO cathode shows impressive rate capability and excellent cycling stability of 5000 cycles with a high energy density of 253 Wh kg ‐1 at 10 A g ‐1 . More importantly, the capacity can maintain at 125 mAh g ‐1 at 4 A g ‐1 even under a raised mass loading of 10 mg cm ‐2 . The proposed “dual‐ion‐in‐sequence” intercalation strategy of manipulating V 2 O 5 structure at atomic scales is a viable pathway for the high‐performance layered metal oxides, not only for ZIBs but also for other energy storage systems.