Impedance Spectroscopy as a Nondestructive Health Interrogation Tool for Lithium-BCX Cells

Branko N. Popov, University of South Carolina - Columbia
W. Zhang, University of South Carolina - Columbia
E. C. Darcy
Ralph E. White, University of South Carolina - Columbia

© The Electrochemical Society, Inc. 1993. 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 the Journal of the Electrochemical Society.

Publisher's link:

DOI: 10.1149/1.2220992


The objective of this investigation was to study the growth of thick passivating layers on the Li anode in Li/BCX (Li/SOCl2 + BrCl) cells which were stored for a period of 3 years. Impedance spectroscopy and equivalent circuit models were used to determine characterizing parameters for these cells. The equivalent circuit used for virgin cells includes a faradic contribution and diffusion of the electroactive species. The equivalent circuit for batteries stored 1 or 2 years includes the impedance of a metal/passive film interface, the resistance of the film, and the impedance of the passivating film/electrolyte interface. The equivalent circuit used for batteries stored for 3 years accounts for cathodic contributions in the overall impedance spectrum.