- Title
- Study on manganese dioxide discharge using electrochemical impedance spectroscopy
- Creator
- Arnott, Jeremy B.; Browning, Gregory J.; Donne, Scott W.
- Relation
- Journal of the Electrochemical Society Vol. 153, Issue 7, p. A1332-A1340
- Publisher Link
- http://dx.doi.org/10.1149/1.2198147
- Publisher
- Electrochemical Society
- Resource Type
- journal article
- Date
- 2006
- Description
- Electrochemical impedance spectroscopy (EIS) has been used to examine the electrochemical and morphological (porosity) changes that the alkaline manganese dioxide cathode undergoes during reduction. Most significantly, within the EIS data a previously unreported intermediate-frequency (2–50 Hz) inductance loop was observed. This inductance loop, as well as the high (>50 Hz) and low (<2 Hz) frequency EIS data, was able to be interpreted in terms of changes in both the manganese dioxide and electrode porosity, as well as mechanical degradation of the manganese dioxide itself. The key finding was that for compositions more reduced than ~MnO₁․₈₀, structural expansion has caused mechanical degradation of individual particles, as well as caused porosity changes within individual manganese dioxide particles and the electrode itself, essentially making them unavailable for discharge (proton insertion). A further implication of this is that the performance of the alkaline manganese dioxide cathode is then predominantly dependent on the geometric surface area and the bulk γ-MnO2 structure.
- Subject
- electrochemical impedance spectroscopy; manganese dioxide
- Identifier
- http://hdl.handle.net/1959.13/26859
- Identifier
- uon:1169
- Identifier
- ISSN:0013-4651
- Rights
- © The Electrochemical Society, Inc. 2010. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of the Electrochemical Society Vol. 153, Issue 7, p. A1332-A1340.
- Language
- eng
- Reviewed
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