A new tunnel-type V4O9 cathode for high power density aqueous zinc ion batteries. Issue 20 (31st August 2021)

• Record Type: Journal Article
• Authors: Wang, Qiaoran; Sun, Tianjiang; Zheng, Shibing; Li, Lin; Ma, Tao; Liang, Jing
• Is Part Of: Inorganic chemistry frontiers. Volume 8:Issue 20(2021)
• Page Start: 4497
• Page End: 4506
• Publication Date: 2021-08-31
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1qi00747e
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : A mixed-valence vanadium oxide V4 O9 with a tunnel structure was synthesized as a cathode material for aqueous zinc ion batteries. A Zn//V4 O9 battery displays high specific capacity and excellent rate performance. Abstract : A mixed valence V4 O9 with a tunnel structure and room temperature metallic properties was prepared via partially reducing vanadium pentoxide. Its unique tunnel structure and metallic characteristics are beneficial for fast zinc ion and electron diffusion. A Zn//V4 O9 battery displays a high rate performance of 234.4 mA h g −1 at 50C, a large reversible capacity of 420 mA h g −1 at 0.5C, and good cycling stability. The intercalation mechanism of Zn 2+ and H + is proved by in situ XRD, ex situ XPS, and other characterization techniques, along with density functional theory calculations. This work provides a strategy to improve the electrochemical performance of vanadium oxides through valence regulation.