期刊
SMALL
卷 16, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202005406
关键词
aqueous zinc‐ ion batteries; manganese oxides; scanning transmission electron microscopy
类别
资金
- Center for Mesoscale Transport Properties, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0012673]
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences [DE-SC0012704]
- William and Jane Knapp Chair in Energy and the Environment
Aqueous Zn/alpha-MnO2 batteries have attracted immense interest owing to their high energy density, low cost, and safety, making them desirable for future large-scale energy application. Despite these merits, the comprehensive understanding of their reaction mechanism has been elusive due to the limitations of standard bulk characterization. Here, via transmission electron microscopy, the dissolution-mediated reaction mechanism of a Zn/alpha-MnO2 system is discovered and explored in full scope to involve reversible formation of Zn4SO4(OH)(6)center dot xH(2)O and birnessite-like Zn-MnOx phase upon cycling. Overall, alpha-MnO2 acts primarily as a source for cell activation through dissolution and thus is not directly involved in the Zn redox chemistry. This microscopic study offers a unique knowledge on the unconventional reaction chemistry of Zn/alpha-MnO2 batteries.
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