High capacity and inexpensive multivalent cathode materials for aqueous rechargeable Zn-ion battery fabricated via in situ electrochemical oxidation of VO2 nanorods
- Authors
- Kidanu, W.G.; Hur, Jaehyun; Choi, Hyung Wook; Kim, Moon Il; Kim, Il Tae
- Issue Date
- 1-Mar-2022
- Publisher
- Elsevier
- Keywords
- Aqueous zinc-ion batteries; In situ electrochemical oxidation; Vanadium dioxide nanorods; Zn metal anode
- Citation
- Journal of Power Sources, v.523
- Journal Title
- Journal of Power Sources
- Volume
- 523
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/84127
- DOI
- 10.1016/j.jpowsour.2022.231060
- ISSN
- 0378-7753
- Abstract
- For large-scale energy storage, aqueous rechargeable zinc-ion batteries are one of the most promising battery systems to replace lithium-ion batteries. In this study, a facile and scalable hydrothermal method is used to prepare VO2 nanorods, which are ball-milled with carbon black to prepare VO2@C nanoparticles. Characterizations using several advanced techniques confirm the successful synthesis of pure VO2 nanorods. Prior to electrochemical measurements, the VO2@C nanostructured cathode materials are transformed into V2O5·nH2O via an in situ electrochemical oxidation technique. The VO2@C/Zn aqueous zinc-ion full cell exhibits a reversible capacity of 300 mA h g−1 and a retention capacity of 85% after 1000 cycles at a current density of 5 A g−1 with a 2 M ZnSO4 electrolyte. The full cell also retains a remarkable capacity of 159 mA h g−1, even after 4000 galvanostatic charge–discharge cycles at 5 A g−1. The cell also shows excellent rate capabilities at a wide range of current densities from 0.1 to 20 A g−1, with a reversible discharge capacity and Coulombic efficiency of 100 mA h g−1 and 99%, respectively, at 20 A g−1. The remarkable performance is attributed to the nanoscale size of the prepared nanorods and the in situ electrochemical transformation. © 2022 Elsevier B.V.
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