An analytical expression for the impedance response of an insertion cathode/separator/foil anode cell sandwich is presented. The analytical expression includes the impedance contributions from interfacial kinetics, double-layer adsorption, and solution-phase and solid-phase diffusion processes. The validity of the analytical solution is ascertained by comparison with the numerical solution obtained for a LiCoO2 /polypropylene/lithium metal cell. The flexibility of the analytical solution is utilized to analyze various limiting conditions. An expression to estimate solid-phase diffusion coefficient of insertion species in a porous electrode influenced by the solution-phase diffusion process is also derived
Published in Journal of the Electrochemical Society, Volume 154, Issue 1, 2007, pages A43-A54.
© The Electrochemical Society, Inc. 2007. 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
Sikha, G. & White, R.E. (2007). Analytical Expression for the Impedance Response of an Insertion Electrode Cell. Journal of the Electrochemical Society, 154(1): A43-A54.
Publisher’s Version: http://dx.doi.org/10.1149/1.2372695