期刊
NANO ENERGY
卷 62, 期 -, 页码 94-102出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.010
关键词
Aqueous zinc-ion battery; Vanadium oxide; Mixed valence; Layer expanded; Flexible quasi-solid-state
类别
资金
- Singapore MOE Tier 2 project [MOE2017-T2-2-069, MOE2018-T2-1-010]
- Singapore MOE AcRF Tier 1 [RG113/15, 2016-T1-002-065]
- National Research Foundation of Singapore Investigatorship [NRF2016NRF-NRFI001-22]
- Singapore EMA project [EIRP 12/NRF2015EWT-EIRP002-008]
Rechargeable aqueous zinc-ion batteries (ZIBs) featured with environmental friendliness, low cost, and high safety have attracted great interest but still suffer from the lack of high-performance electrodes. Herein, a facile in situ approach is developed to simultaneously introduce multivalence, increase the interlayer water content, and expand the interlayer distance in hydrated V2O5. These structural modulations endow the as-obtained layer-expanded V2O5 2.2H(2)O (E-VO) nanosheets with faster charge transfer kinetics, more Zn2+ storage space, and higher structural stability than precursor V2O5. Besides, a unique flexible Zn/stainless steel (Zn/SS) mesh composite anode with low polarization and uniform Zn stripping/plating behavior is fabricated, which alleviates the Zn dendrite growth. As cathode for aqueous ZIBs, E-VO exhibits high reversible capacity (450 mAh g(-1) at 0.1 A g(-1)), good rate capability (222 mAh g(-1) at 10 A g(-1)) and long stability (72% capacity retention for 3000 cycles at 5 A g(-1)). Moreover, the flexibility and large lateral size make E-VO a high-performance binder-free cathode for flexible quasi-solid-state Zn/E-VO battery, i.e. high capacity under different bending states (361 mAh g(-1) at 0.1 A g(-1)), good rate capability (115 mAh g(-1) at 2 A g(-1)), and long stability (85% capacity retention for 300 cycles at 1 A g(-1)). The achievements of this study can be considered as an important step toward the development of aqueous-based ZIBs.
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