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Effect of Physical and Geometric Factors on the Impedance of Electrochemical Power Sources.
CASE WESTERN RESERVE UNIV CLEVELAND OHIO DEPT OF PHYSICS
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Short-time transient behavior in the chargedischarge of small electrochemical power sources does not scale up for large systems. calculations are presented which show that a number of commonly neglected physical and geometric factors, such as the skin effect and the distributed network impedance characteristics of the individual cells and cell assemblies, can severely limit performance. The impedance of individual cells has been calculated over a wide range of frequencies 100-10th to the 8th Hz using a modified semi-infinite strip-line model. The variables considered include the electrode and electrolyte conductivities, the electrolyte dielectric constant, the double-layer capacitance, and the distributed inductance and capacitance resulting from the cell geometry. Keywords Impedance, Electrochemical Power Sources, Computer Modeling, Electrochemical Cells, Pulsed High Power Batteries.
APPROVED FOR PUBLIC RELEASE