Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 20, Pages 10370-10376Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta03165h
Keywords
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Funding
- Beijing Natural Science Foundation [L172023, 2204086]
- Postdoctoral Science Fund of China [214060]
- University Basic Research Fund of China [06500105]
- National Natural Science Foundation of China [51532002, 51872027, 51802297]
- National Basic Research Program of China [2017YFE0113500]
- Key R&D Program of Guangdong Province [2018B030327001, 2018B010109009]
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Aqueous zinc ion batteries (ZIBs) have attracted intensive attention due to their low cost, environmental friendliness and high safety. However, exploring suitable cathode materials and a deep understanding of their energy storage mechanisms remain a daunting challenge. In this work, a three-dimensional (3D) nest-like V6O13 structure is grown on carbon cloth (CC) as a free-standing ZIB cathode. Such interconnected V6O13 nanoneedles forming a 3D nest structure provide a large accessible surface area to the electrolyte and rapid channels for Zn2+ diffusion, and V6O13 with a V5+-rich state allows for more possibilities of multielectron reaction upon Zn (de)intercalation. As a result, an aqueous ZIB based on the V6O13/CC cathode and low-cost ZnSO4 electrolyte shows an ultrahigh capacity of 520 mA h g(-1) (at a current density of 0.5 A g(-1)), desirable rate capability and cycle life (showing a stable capacity of 335 mA h g(-1) over 1000 cycles). Moreover, the Zn2+ storage mechanism is deeply investigated based on experimental data and density functional theory simulation, and flexible solid-state ZIBs are established based on such a V6O13/CC cathode to reveal its high functional flexibility and excellent electrochemical performance, showing great potential applications in high-performance and safe electronic devices.
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