Journal
JOURNAL OF POWER SOURCES
Volume 179, Issue 1, Pages 361-366Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.12.075
Keywords
birnessite; electrodeposition; layered structure; manganese oxide; lithium battery
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Layered manganese dioxide (MnO2) films intercalated with Li+, Na+ or Mg2+ ions were synthesized by a one-step electrochemical method. The electrodeposition was potentiostatically performed by applying an anodic potential of 1.0 V vs. Ag/AgCl in an aqueous MnSO4 solution containing a perchlorate salt of the cation. The electrodeposited oxide films have a birnessite-type layered structure with alkali cations and water molecules between manganese oxide layers. The galvanostatic charge-discharge experiments performed in I M LiPF6-DME/PC solution indicated that the Mg2+-intercalated MnO2 electrode exhibits an initial discharge capacity as large as 140 mAh g(-1) and it shows a better capacity retention during cycling as compared with the Li+- or Na+-intercalated MnO2 electrode. (C) 2007 Elsevier B.V. All rights reserved.
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