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Processing and Properties of Amorphous Manganese Dioxide Formed by Sol-Gel Procedures

Published online by Cambridge University Press:  10 February 2011

Jun John Xu ,
Stefano Passerini ,
Boone B. Owens  and
William H. Smyrl
Jun John Xu
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
Stefano Passerini
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
Boone B. Owens
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
William H. Smyrl
Affiliation:
Corrosion Research Center, Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
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Abstract

Sol-gel derived amorphous manganese dioxide (a-MnO2) showed extremely high reversible lithium intercalation capacity. The composition and structure of the material were modified by heating at different temperatures. Cycling performance of the modified samples suggests that lowering the water content in the material is beneficial, while introducing crystallinity is detrimental, to its cyclability. A novel double-solvent-exchange process was tried for the processing of the material. Preliminary results indicated significant improvement in the reversibility of the insertion/release cycles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 119
Copyright
Copyright © Materials Research Society 1999

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References

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