期刊
CHEMICAL ENGINEERING JOURNAL
卷 404, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126536
关键词
Vanadium oxide; Aqueous zinc ion battery; Cathode materials; Physical defects; Chemistry defects
资金
- National Key Research and Development Project [2019YFC1907801]
- National Basic Research Program of China [2014CB643401]
- Hunan Provincial Science and Technology Plan Projects [2019JJ30031, 2016TP1007]
- International Postdoctoral Exchange Fellowship Program (Talent-Introduction Program)
- Innovation-Driven Project of Central South University [2020CX007]
Vanadium oxide nanofibers with physical and chemical defects were fabricated by electrospinning for application in aqueous zinc ion batteries, demonstrating outstanding electrochemical performance and efficient zinc ion transportation.
Vanadium oxides are considered as promising cathode materials for aqueous zinc ions batteries (AZIBs). However, the long diffusion distance, low diffusion coefficient, and strong electrostatic interactions with divalent Zn2+ in bulk vanadium oxide restrict their practical application. In this work, vanadium oxide nanofibers with physical and chemical defects were facilely fabricated by electrospinning for the application in AZIBs. The hierarchical framework exhibits structure stability during insertion/ extraction processes of zinc ions, and the extracted zinc ions are easily confined in the caverns of porous fibers to shorten the diffusion paths. Furthermore, the electrochemical reaction mechanism was verified by using in situ Raman and ex situ XPS and HRTEM, demonstrating a co-insertion mechanism of zinc ions and H+. The cathode shows a fast activation process, exhibiting a high capacity of 256 mAh g(-1) at 1 A g(-1), and the capacity fading of only 17% is observed after 1000 cycles at 5 A g(-1). The outstanding electrochemical performances and efficient Zn2+ transportation can be attributed to the synergism of physical and chemical defects. This strategy of dual defects may provide new insights into the improvements of AZIBs performance.
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