Accession Number : ADA111687

Title :   Impedance of Aerospace NiCd Cells under Open Circuit Conditions.

Descriptive Note : Interim rept,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA

Personal Author(s) : Zimmerman,A H

PDF Url : ADA111687

Report Date : 25 Jan 1982

Pagination or Media Count : 29

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)

Descriptors :   *Nickel cadmium batteries, *Electrolytic cells, *Electrodes, *Battery separators, Alkaline batteries, Aerospace systems, Plates, Circuits, Diffusion, Solid state electronics, Data processing, Electrolytes, Impedance, Spectra

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE