期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201807331
关键词
aqueous zinc batteries; cathode; energy storage; flexible devices; hydrated vanadium oxide
类别
资金
- Project of One Province, One University
- National Natural Science Foundation of China [21805066, 21805007]
- China Postdoctoral Science Foundation [2018M640244]
- Young Elite Scientists Sponsorship Program by CAST
- Fundamental Research Funds for the Central Universities [FRF-TP-16-078A1]
- 111 Project [B12015]
Rechargeable aqueous zinc batteries have gained considerable attention for large-scale energy storage systems because of their low cost and high safety, but they suffer from limitations in cycling stability and energy density with advanced cathode materials. Here, a high-performance V5O12 center dot 6H(2)O (VOH) nanobelt cathode uniformly located on a stainless-steel substrate via a facile electrodeposition technique is reported. We show that the hydrated layered VOH cathode enables highly reversible and ultrafast Zn2+ cation (de)intercalation processes, as confirmed by various electrochemical, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy analyses. It is demonstrated that the binder-free VOH cathode can deliver a discharge capacity of 354.8 mAh g(-1) at 0.5 A g(-1) with a high initial Coulombic efficiency of 99.5%, a high energy density of 194 Wh kg(-1) at 2100 W kg(-1), and a long cycle life with a capacity retention of 94% over 1000 cycles. In addition, a flexible quasi-solid-state Zn-VOH battery is constructed, achieving a reversible capacity of approximate to 300 mAh g(-1) with a capacity retention of 96% after 50 cycles and displaying excellent electrochemical behaviors under different bending states. This work sheds light on the development of rechargeable aqueous zinc batteries for stationary grid storage applications or flexible energy storage devices.
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