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    Lithium insertion into manganese dioxide electrode in MnO2/Zn aqueous bettery Part III. Electrochemical behavior of y-MnO2 in aqueous lithium hydroxide electrolyte

    Access Status
    Fulltext not available
    Authors
    Minakshi, M.
    Singh, P.
    Issa, T.
    Thurgate, S.
    De Marco, Roland
    Date
    2006
    Type
    Journal Article
    
    Metadata
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    Citation
    Minakshi, Manickam and Singh, Pritam and Issa, Touma and Thurgate, Stephen and De Marco, Roland. 2006. Lithium insertion into manganese dioxide electrode in MnO2/Zn aqueous bettery Part III. Electrochemical behavior of y-MnO2 in aqueous lithium hydroxide electrolyte. Journal of Power Sources 153: 165-169.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2005.03.184
    Faculty
    Department of Applied Chemistry
    Division of Engineering, Science and Computing
    Faculty of Science
    Remarks

    Copyright 2005 Elsevier B.V. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/15729
    Collection
    • Curtin Research Publications
    Abstract

    The electrochemical behavior of -MnO2 in lithium hydroxide (LiOH) and potassium hydroxide (KOH) aqueous media has been studied using slow-scan cyclic voltammetry (25Vs-1) in conjunction with X-ray analysis (XRD) and scanning electron microscopy (SEM). The reduction of -MnO2 in aqueous LiOH results in intercalation of Li+ forming a new phase of lithium intercalated MnO2 (LixMnO2). The process is found to be reversible. In this regard, the reduction of -MnO2 in LiOH is quite different from that in aqueous KOH, which is irreversible and no lithium intercalation occurs. This difference in behavior is explained in terms of the relative ionic sizes of Li + and K+. The LixMnO2 lattice is stable only for Li+ because Li+ and Mn4+ are of approximately the same size whereas KxMnO2 is not stable because K+ has almost double the size.

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