Simultaneous pre-intercalation of caesium and sodium ions into vanadium oxide bronze nanowires for high-performance aqueous zinc-ion batteries. (15th June 2022)

• Record Type: Journal Article
• Authors: Tian, Hua; He, Yunyi; Wang, Lin; Lai, Yuannan; Wang, Jianwei; Xiang, Hanqing; Zhao, Wenjun; Zhang, Lin
• Is Part Of: Materials chemistry frontiers. Volume 6:Number 14(2022)
• Page Start: 1920
• Page End: 1928
• Publication Date: 2022-06-15
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/d2qm00420h
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : The simultaneous pre-intercalation of caesium and sodium ions into vanadium oxide bronze nanowires can enlarge the interplanar spacing and afford surface oxygen defects conducive to improving zinc energy storage performance. Abstract : Vanadium oxide derivatives as cathode materials for aqueous zinc-ion batteries have received increasing attention owing to their multivalent vanadium species and open-frame crystal structures. Herein, heavyweight and lightweight alkali metal ions as pillars involving caesium and sodium ions were simultaneously pre-intercalated into vanadium oxide bronze nanowires in the presence of polyethylene glycol. The pre-intercalation of Na + ions contributed to the formation of the two-dimensional tunnel structure of vanadium oxide bronzes. Remarkably, the accommodation of additional Cs + ions in the interlayer region facilitated an expansion of the interplanar spacing and an increase in the surface oxygen defects. When used in aqueous zinc-ion batteries, Na0.33 Cs0.03 V2 O5 (NCVO) cathodes achieved a high reversible capacity of 376.5 mA h g −1 at 0.1 A g −1 in addition to excellent long-term cycling stability with a capacity retention of 95.4% over 1500 cycles at 5.0 A g −1 . Furthermore, the results from ex situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analyses revealed that the co-intercalation of caesium and sodium ions contributed to the reversible phase change of vanadium oxide bronzes during repeated Zn 2+ -ion deintercalation–intercalation processes after the conversion reaction observed in the initial discharge process, which opens up a route to develop high-performance cathode materials.