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Electrochemical Li Insertion in Lamellar (Birnessite) and Tunnel Manganese Oxides (Todorokite)

Published online by Cambridge University Press:  10 February 2011

M. J. Duncan ,
F. Leroux  and
L. F. Nazar
M. J. Duncan
Affiliation:
University of Waterloo, Department of Chemistry, Waterloo, Ontario Canada N2L 3G1; lfnazar@uwaterloo.ca
F. Leroux
Affiliation:
University of Waterloo, Department of Chemistry, Waterloo, Ontario Canada N2L 3G1; lfnazar@uwaterloo.ca
L. F. Nazar
Affiliation:
University of Waterloo, Department of Chemistry, Waterloo, Ontario Canada N2L 3G1; lfnazar@uwaterloo.ca
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Abstract

A comparison of Li insertion in manganese oxide phases with a tunnel (todorokite) framework, its two-dimensional layered precursor (birnessite/buserite), and Li-exchanged materials are presented. The results outline the effect of the MnO6 octahedral arrangement and framework composition on the electrochemical response. The interlayer cations in the lamellar materials are exchangeable for Li, giving rise to a lithiated birnessite that displays a sustainable capacity of 125 mAh/g. For todorokite, molten salt exchange using LiNO3 results in displacement of water from the tunnels, and incorporation of additional Li into the structure. Some of this Li is extractable during charge, resulting in a reversible capacity of 172 mAh/g in the voltage window 4.2–2.0V.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 385
Copyright
Copyright © Materials Research Society 1998

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References

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