Abstract
Abstract : The open circuit impedance of 10-A h sealed NiCd cells has been measured from 0 to 100,00 Hz as a function of cell state of charge and temperature. The open-circuit impedance at frequencies below 0.01 Hz is modeled by two consecutive diffusion-controlled charge transfer processes in the NiCd cell. Data analysis indicates that both solid-state diffusion processes and electrolyte diffusion processes are consistent with the data. Because concentration polarization is known to occur in NiCd cells, the two observed processes are tentatively assigned to electrolyte diffusion in the positive and negative plates. The resolution of these processes in the impedance spectrum is sensitive to the relative pore structure and morphology of the electrode plates. (Author)
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