期刊
JOURNAL OF POWER SOURCES
卷 288, 期 -, 页码 320-327出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.04.140
关键词
Manganese dioxide; Nanostructured electrode; Electrochemical properties; Zinc-ion battery; Energy storage
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2014R1A2A1A10050821]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2009-0094055]
In the present study, a nanorod-type alpha-MnO2 cathode is prepared by a facile hydrothermal method for rechargeable aqueous zinc-ion battery (ZIB) applications. Electron microscopy studies reveal rod shaped particles with approximately 20 nm of width and 200 nm of length. When tested for aqueous ZIBs, the alpha-MnO2 nanorod cathode exhibits an initial discharge capacity of 233 mA h/g at a current density of 83 mA/g with nearly 100% Coulombic efficiencies under prolonged cycling. Besides, the prepared cathode demonstrates decent rate capabilities at higher current densities (4333 and 31.48 mA h/g at 1333 and 1666 mA/g, respectively). Ex-situ synchrotron XAS investigations clearly establish the reversibility of electrochemical Zn-insertion into the alpha-MnO2 nanorod cathode. The analyses also reveal that the host alpha-MnO2 structure demonstrates considerable structural stability during Zn-insertion/extraction. Further, a combination of ex-situ synchrotron XRD studies, visualization and pattern-fitting software programs not only confirm electrochemical Zn-insertion into the host alpha-MnO2 structure but also suggest that the unit cell volume of the [2x2] tunnels in the alpha-MnO2 host expands by approximately 3.12% during Zn-insertion. The present study thus paves the way for further development of eco-friendly ZIB as an ideal energy storage system due to its excellent safety and reliability. (C) 2015 Elsevier B.V. All rights reserved.
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