Zn-doped V2O5 film electrodes as cathode materials for high-performance thin-film zinc-ion batteries

• Published in: Solid state ionics Vol. 416; p. 116658
• Main Authors: Zhang, Yigao, Xu, Haiyan, He, Yang, Bian, Hanxiao, Jiang, Renhua, Zhao, Qiang, Li, Dongcai, Wang, Aiguo, Sun, Daosheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2024
• Subjects: Electrochemical properties; Low temperature liquid phase deposition; Thin-film zinc-ion batteries; Zn-doped V2O5 films; Zn-doped V2O5 films; Thin-film zinc-ion batteries; Electrochemical properties; Low temperature liquid phase deposition
• ISSN: 0167-2738
• DOI: 10.1016/j.ssi.2024.116658

Zn-doped V2O5 film electrodes were prepared by in-situ growth on indium‑tin oxide (ITO) conductive glass by a low-temperature liquid-phase deposition method and calcined by calcination treatment, and assembled into thin-film zinc-ion batteries (ZIBs). After galvanostatic charge/discharge (GCD) tests with 90 and 200 charge/discharge cycles, the ZIBs system provided specific capacities of 95.7 mAh m−2 and 63.9 mAh m−2 with capacity retention rates of 97.88% and 78.72%, respectively. The electrochemical reaction process of the Zn-doped V2O5 film electrode was analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to understand the insertion/extraction mechanism of Zn2+. The doping of appropriate amount of Zn2+ in the preparation plays the role of “pillar”, which helps to stabilize the structure of V2O5 and improve the cycling stability and lifetime. Therefore, the research may provide a new idea for the assembly and preparation of thin-film ZIBs with improved performance. [Display omitted] •Zn-doped V2O5 films were prepared by low-temperature liquid-phase deposition.•The films on ITO substrates are easy to figure out the ion de/insertion mechanism.•Thin-film zinc-ion batteries have portability and good performance.