A distinctive conversion mechanism for reversible zinc ion storage. Issue 11 (3rd May 2022)

• Record Type: Journal Article
• Authors: Ma, Yandong; Qi, Yuruo; Niu, Yubin; Liu, Yijun; Bao, Shujuan; Xu, Maowen
• Is Part Of: Inorganic chemistry frontiers. Volume 9:Issue 11(2022)
• Page Start: 2706
• Page End: 2713
• Publication Date: 2022-05-03
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2qi00362g
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : V2 O3 @C exhibits a different energy storage mechanism at high voltage from intercalation chemistry (in the low voltage range) with the decomposition and deposition of Zn3 V2 O7 (OH)2 ·2H2 O. Abstract : For a long time, in aqueous zinc-ion batteries, the intercalation/extraction chemistry of Zn 2+ /H + has been considered as the primary energy storage mechanism in vanadium-based compounds. Herein, we observed an interesting phase transition of V2 O3 to V2 O5 ·3H2 O under high-voltage conditions. The reconstructed phase (V2 O5 ·3H2 O) displays an improved specific capacity of 472.4 mA h g −1, about 5 times larger than that of the original compound (V2 O3 ). What's more, the electrode exhibits a highly reversible conversion reaction between V2 O5 ·3H2 O and Zn3 V2 O7 (OH)2 ·2H2 O (ZVO) during the charge/discharge process, showing an excellent rate capability and cycling stability. The findings also confirm the electrochemical activity of ZVO, which has generally been considered to be an inactive by-product. This energy storage mechanism, different from the previously reported intercalation chemistry, offers a new insight to understand the electrochemical behavior of V-based electrode materials.