A three-dimensional interconnected V6O13 nest with a V5+-rich state for ultrahigh Zn ion storage. Issue 20 (15th May 2020)

• Record Type: Journal Article
• Authors: He, Pingge; Liu, Jiahao; Zhao, Xudong; Ding, Zhengping; Gao, Peng; Fan, Li-Zhen
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 20(2020)
• Page Start: 10370
• Page End: 10376
• Publication Date: 2020-05-15
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta03165h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Ultrahigh Zn ion storage is achieved by tuning the valence state and constructing a three-dimensional structure on V6 O13 multi-valent oxide cathodes. Abstract : Aqueous zinc ion batteries (ZIBs) have attracted intensive attention due to their low cost, environmental friendliness and high safety. However, exploring suitable cathode materials and a deep understanding of their energy storage mechanisms remain a daunting challenge. In this work, a three-dimensional (3D) nest-like V6 O13 structure is grown on carbon cloth (CC) as a free-standing ZIB cathode. Such interconnected V6 O13 nanoneedles forming a 3D nest structure provide a large accessible surface area to the electrolyte and rapid channels for Zn 2+ diffusion, and V6 O13 with a V 5+ -rich state allows for more possibilities of multielectron reaction upon Zn (de)intercalation. As a result, an aqueous ZIB based on the V6 O13 /CC cathode and low-cost ZnSO4 electrolyte shows an ultrahigh capacity of 520 mA h g −1 (at a current density of 0.5 A g −1 ), desirable rate capability and cycle life (showing a stable capacity of 335 mA h g −1 over 1000 cycles). Moreover, the Zn 2+ storage mechanism is deeply investigated based on experimental data and density functional theory simulation, and flexible solid-state ZIBs are established based on such a V6 O13 /CC cathode to reveal its high functional flexibility and excellent electrochemical performance, showing great potential applications in high-performance and safe electronic devices.