V‐O‐Ru Heterogeneous Interphase Reversible Reconstruction Endowing Zn <sub>0.85</sub> V <sub>10</sub> O <sub>24</sub> ·7.4H <sub>2</sub> O/0.65RuO <sub>2</sub> Cathode Robust H <sup>+</sup> /Zn <sup>2+</sup> Storage
Dai‐Huo Liu, Ao Wang, Yaozhi Liu, Fang Xu, Dan Luo, Jialin Zheng, Mengqin Song, Chunyan Xu, Zhongwei Chen
Abstract
Abstract Intercalation‐type layered vanadium oxides have been widely explored as cathode materials for aqueous zinc–ion batteries (AZIBs). However, attaining both high power density and superior stability remains a formidable challenge. Herein, layered vanadium oxides are pre‐intercalated with Zn 2+ to form Zn 0.85 V 10 O 24 ·7.4H 2 O (ZVO), which is then combined with RuO 2 nanoparticles to construct a ZVO/RuO 2 heterostructure featuring interphase V─O─Ru bonds. ZVO/RuO 2 heterostructure exhibits a dynamic stable coupling at the interphase via V─O─Ru chemical bonds reconstruction during discharging/charging processes. The dynamically reversible reconstruction of interphase V─O─Ru bonds provides a fast electron transfer channel between RuO 2 and ZVO cathode, as demonstrated by ex situ X‐ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations, making RuO 2 an additional electron acceptor and donor, and accelerating the migration of H + /Zn 2+ in layered ZVO cathode. Therefore, an ultra‐high capacity (411 mAh g −1 at 0.5 A g −1 , 225 mAh g −1 at 20 A g −1 ) and long cycling stability (a retention of 92.2% at 20 A g −1 over 20000 cycles) performances are achieved. This interphase reversible reconstruction route provides a promising approach to achieving excellent cycling stability in cathode materials.