K-ion modified V2O5 with abundant oxygen defects as cathode for aqueous zinc-ion battery

• Published in: Materials letters 2024-10, Vol.373, p.137139, Article 137139
• Main Authors: Jiaxing, Tian, Zejing, Wang, Yujie, Jiao, Hao, Wei, Jiandong, Wu, Hui, Lu, Shaolin, Yang, Jinfu, Ma, Zhilin, Sheng, Chunping, Hou
• Format: Article
• Language: English
• Subjects: Aqueous zinc-ion batteries; Cathode; Defects; Energy storage and conversion; K0.1V2O5
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2024.137139

•K0.1V2O5 with abundant oxygen defects was synthesized.•The DZn in K0.1V2O5 are comparable with other cathodes materials.•K0.1V2O5 with abundant oxygen defects shows good performance as cathode for ZIBs. Aqueous zinc-ion batteries (ZIBs) are anticipated to be used for grid-scale energy storage because of their low cost, abundant resources, high safety, and non-toxicity. In this study, K-ion modified V2O5 with abundant oxygen defects (K0.1V2O5) was prepared using a one-step hydrothermal reaction followed by heat treatment. K0.1V2O5 showed remarkable specific capacity (307.9 mAhg−1 at 0.2 Ag−1), exceptional rate capability (184.3 mAhg−1 at 10 Ag−1), and good cycling stability (88.5 % capacity retention rate after 2000 cycles at 10 Ag−1). Furthermore, electrochemical kinetics revealed that the electrochemical process of the K0.1V2O5 electrode is governed by both ion diffusion and capacitive contribution, with the diffusion coefficient of Zn2+ ranging between 10−11 and 10−9 cm2 s−1. The exceptional performance of K0.1V2O5 makes it a promising candidate for cathode materials in zinc-ion batteries (ZIBs).