Dual-cation preintercalated and amorphous carbon confined vanadium oxides as a superior cathode for aqueous zinc-ion batteries. (January 2022)

• Record Type: Journal Article
• Authors: Zhao, Xun; Mao, Lei; Cheng, Qihui; Liao, Fangfang; Yang, Guiyuan; Chen, Lingyun
• Is Part Of: Carbon. Volume 186(2022)
• Page Start: 160
• Page End: 170
• Publication Date: 2022-01
• Subjects: Dual-cation preintercalation -- Amorphous carbon confinement -- Vanadium oxide -- In situ electrochemical oxidation -- Aqueous zinc ion batteries; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.10.013
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Rechargeable aqueous zinc-ion batteries (AZIBs) that directly use metallic zinc as anode and mildly acidic Zn 2+ -containing aqueous solutions as electrolytes have exhibited promising complementarity for well-established lithium-ion batteries. The fabrication of high-voltage, high-capacity, and durable cathode and stable anode are the burning issues of fabricating high-performance AZIBs. Herein, the small amount of dual-cation preintercalated and amorphous carbon confined vanadium dioxide (Ni0.006 Ca0.0045 VO2 @C) was prepared for high-performance Zn 2+ -storage materials, and subsequent in situ electrochemical anodic oxidation strategy was used to convert Ni0.006 Ca0.0045 VO2 @C to δ-(Ni, Ca)V2 O5 @C as high-capacity AZIB cathode. The elaborate architecture not only showed a high specific capacity of 433.8 mAh g −1 at 0.1 A g −1 but also retained a reversible capacity of 74 mAh g −1 after 4000 cycles at 5 A g −1 . In addition, the Zn 2+ /H + co-intercalation mechanism was also verified by employing ex situ XRD and ex situ XPS. Finally, the flexible quasi-solid-state ZIBs were also assembled with the Ni0.006 Ca0.0045 VO2 @C as cathode and polyvinyl alcohol hydrogel as electrolyte, suggesting its promising application for the superior Zn 2+ -storage performance. Graphical abstract: Image 1 Highlights: Based on dual-engineering and in situ electrochemical conversion strategy, we proposed Ni0.006 Ca0.0045 VO2 @C for a AZIB cathode. The cathode delivers a high specific discharge capacity of 433.8 mAh g −1 at 0.1 A g −1 . The in situ electrochemical oxidation process and Zn 2+ /H + co-intercalation are elaborated by ex situ XRD and ex situ XPS. Successful application of PVA-based hydrogel for flexible quasi-solid-state ZIBs.