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The role of Cu ions of the self-reassembled MnO2 nanosheets for rechargeable aqueous batteries

Authors
Journal
Journal of the European Ceramic Society
0955-2219
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.jeurceramsoc.2014.05.005
Keywords
  • Rechargeable Aqueous Batteries
  • Mno2 Nanosheets
  • Irreversible Phase Transformation
  • Cu
Disciplines
  • Chemistry

Abstract

Abstract Cu2+ ions inserted MnO2 electrodes (Cu-NS-MnO2) were prepared via nanosheet processes, and their electrochemical properties were investigated. In basic aqueous solutions, layer-structured MnO2 compounds usually show the irreversible phase transformation into Mn3O4 phase with a rapid decrease in a capacity. In this study, however, the Cu-NS-MnO2 showed relatively good cyclic properties with slow phase transformation at KOH solution. The Cu-NS-MnO2 exhibited a large discharge capacity of 230mAh/g-MnO2 at the first cycle, and maintained a specific capacity of 170mAh/g-MnO2 after 10 cycles at a current density of 300mA/g-MnO2. These results suggest that Cu ions and nanosheet processes have effects to inhibit the irreversible phase transformation into Mn3O4 phase and maintain electrochemical activity under the basic condition. In this study, the role of Cu ions on electrochemical properties of the self-reassembled MnO2 nanosheets was investigated.

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