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

M. Minakshi; P. Singh; T.B. Issa; S. Thurgate; R. De Marco

doi:10.1016/j.jpowsour.2005.03.184

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

Journal article

Peer reviewed

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

M. Minakshi, P. Singh, T.B. Issa, S. Thurgate and R. De Marco

Journal of Power Sources, Vol.153(1), pp.165-169

2006

DOI: https://doi.org/10.1016/j.jpowsour.2005.03.184

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Abstract

The electrochemical behavior of γ-MnO2 in lithium hydroxide (LiOH) and potassium hydroxide (KOH) aqueous media has been studied using slow-scan cyclic voltammetry (25 μV s−1) in conjunction with X-ray analysis (XRD) and scanning electron microscopy (SEM). The reduction of γ-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 γ-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.

Details

Title: Lithium insertion into manganese dioxide electrode in MnO2/Zn aqueous batteryPart III. Electrochemical behavior of γ-MnO2 in aqueous lithium hydroxide electrolyte
Authors/Creators: M. Minakshi (Author/Creator) - Murdoch University
P. Singh (Author/Creator) - Murdoch University
T.B. Issa (Author/Creator) - Murdoch University
S. Thurgate (Author/Creator) - Murdoch University
R. De Marco (Author/Creator) - Curtin University
Publication Details: Journal of Power Sources, Vol.153(1), pp.165-169
Publisher: Elsevier BV
Identifiers: 991005542603007891
Murdoch Affiliation: School of Chemical and Mathematical Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.62 Electrochemistry; 2.62.52 Electrode Materials
Web Of Science research areas: Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary
ESI research areas: Materials Science