Journal
SMALL
Volume 14, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703850
Keywords
cathode materials; graphene scroll-coated -MnO2; high performance; Zn-ion batteries
Categories
Funding
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51502227, 51579198]
- National Key Research and Development Program of China [2016YFA0202603, 2016YFA0202604]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- China Postdoctoral Science Foundation [2015T80845]
- project of Innovative group for low cost and long cycle life Na ion batteries R&D and industrialization of Guangdong Province [2014ZT05N013]
- Hubei Province Natural Science Fund [2016CFB582]
- Wuhan Morning Light Plan of Youth Science and Technology [2017050304010316]
- State Key Laboratory of Advanced Technology for Materials and Processing at Wuhan University of Technology [2016-KF-1]
- Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education
- State of Washington through the University of Washington Clean Energy Institute
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The development of manganese dioxide as the cathode for aqueous Zn-ion battery (ZIB) is limited by the rapid capacity fading and material dissolution. Here, a highly reversible aqueous ZIB using graphene scroll-coated alpha-MnO2 as the cathode is proposed. The graphene scroll is uniformly coated on the MnO2 nanowire with an average width of 5 nm, which increases the electrical conductivity of the MnO2 nanowire and relieves the dissolution of the cathode material during cycling. An energy density of 406.6 Wh kg(-1) (382.2 mA h g(-1)) at 0.3 A g(-1) can be reached, which is the highest specific energy value among all the cathode materials for aqueous Zn-ion battery so far, and good long-term cycling stability with 94% capacity retention after 3000 cycles at 3 A g(-1) are achieved. Meanwhile, a two-step intercalation mechanism that Zn ions first insert into the layers and then the tunnels of MnO2 framework is proved by in situ X-ray diffraction, galvanostatic intermittent titration technique, and X-ray photoelectron spectroscopy characterizations. The graphene scroll-coated metallic oxide strategy can also bring intensive interests for other energy storage systems.
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