Journal of Applied Electrochemistry

, Volume 9, Issue 5, pp 581–585 | Cite as

Impedance parameters and the state-of-charge. III. Zinc-manganese dioxide and magnesium-manganese dioxide dry batteries

  • M. L. Gopikanth
  • S. Sathyanarayana


The problem of non-destructive determination of the state-of-charge of zinc- and magnesium-manganese dioxide dry batteries is examined experimentally from the viewpoint of internal impedance and open-circuit voltage at equilibrium. It is shown that the impedance is mainly charge-transfer controlled at relatively high states-of-charge and progressively changes over to diffusion control as the state-of-charge decreases in the case of zinc-manganese dioxide dry batteries. On the other hand, the impedance is mainly diffusion controlled for undischarged batteries but becomes charge-transfer controlled as soon as there is some discharge in the case of magnesium-manganese dioxide batteries. It is concluded that the determination of state-of-charge is not possible for both types of batteries by the measurement of impedance parameters due to film-induced fluctuations of these parameters. The measurement of open-circuit voltage at equilibrium can be used as a state-of-charge indicator for Zn-MnO2 batteries but not for Mg-MnO2 batteries.


Zinc Physical Chemistry Dioxide Impedance Parameter Internal Impedance 
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  1. [1]
    S. Sathyanrayana, S. Venugopalan and M. L. Gopikanth,J. Appl. Electrochem. 9 (1979) 125.Google Scholar
  2. [2]
    M. L. Gopikanth and S. Sathyanarayana,ibid 9 (1979) 369.Google Scholar

Copyright information

© Chapman and Hall Ltd 1979

Authors and Affiliations

  • M. L. Gopikanth
    • 1
  • S. Sathyanarayana
    • 1
  1. 1.Department of Inorganic and Physical ChemistryIndian Institute of ScienceBangaloreIndia

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