Electrochemical activation strategies of a novel high entropy amorphous V-based cathode material for high-performance aqueous zinc-ion batteries. Issue 34 (20th August 2021)

• Record Type: Journal Article
• Authors: Zhang, Shangshang; Liu, Zhenjiang; Li, Lun; Tang, Yudie; Li, Shengkai; Huang, Haitao; Zhang, Haiyan
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 34(2021)
• Page Start: 18488
• Page End: 18497
• Publication Date: 2021-08-20
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta05205e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Two electrochemical activation strategies induce the activation of the amorphous high entropy V x O y @C as a high-performance cathode material for AZIBs. Abstract : V-based materials are widely applied as cathode materials for aqueous zinc-ion batteries because the high potential of V 5+ provides a thermodynamic basis for the transition of Zn 2+ . The isotropy of high entropy amorphous vanadium oxide not only avoids the performance degradation caused by the broken crystal structure, but also offers more active sites and improves the solid-state solubility and transfer kinetics of Zn 2+ . Herein, a high entropy amorphous vanadium oxide@carbon matrix (V x O y @C) was obtained via a simple coprecipitation method. Two electrochemical activation strategies could induce the activation of amorphous V x O y @C as a high-performance cathode material for aqueous zinc-ion batteries (AZIBs). After electrochemical activation, the amorphous V x O y @C exhibited a high specific capacity of 399.1 mA h g −1, high rate capability of 314.1 mA h g −1 at 2.0 A g −1 and excellent cycling stability for up to 300 cycles with a specific capacity retention of 91.8%. It was proven that the amorphous lump of V x O y @C transforms into an amorphous fibrous material accompanied by an increase in the valency of V. With the insertion of Zn 2+, the fibrous materials would be reversibly converted into a lamellar structure.