Analytical solution for electrolyte concentration distribution in lithium-ion batteries |
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| Authors: | Anupama Guduru Paul W. C. Northrop Shruti Jain Andrew C. Crothers T. R. Marchant Venkat R. Subramanian |
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| Affiliation: | (1) Department of Chemical Engineering, Tennessee Tech University, Cookeville, TN 38505, USA;(2) Present address: Bechtel Corporation, Houston, TX, USA;(3) Department of Energy, Environmental and Chemical Engineering, Washington University, St. Louis, MO 63130, USA;(4) Department of Chemical Engineering, Indian Institute of Technology, Gandhinagar, 380005, Gujarat, India;(5) Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695, USA;(6) School of Mathematics and Applied Statistics, University of Wollongong, Wollongong, NSW, 2522, Australia; |
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| Abstract: | In this article, the method of separation of variables (SOV), as illustrated by Subramanian and White (J Power Sources 96:385, 2001), is applied to determine the concentration variations at any point within a three region simplified lithium-ion cell sandwich, undergoing constant current discharge. The primary objective is to obtain an analytical solution that accounts for transient diffusion inside the cell sandwich. The present work involves the application of the SOV method to each region (cathode, separator, and anode) of the lithium-ion cell. This approach can be used as the basis for developing analytical solutions for battery models of greater complexity. This is illustrated here for a case in which non-linear diffusion is considered, but will be extended to full-order nonlinear pseudo-2D models in later work. The analytical expressions are derived in terms of the relevant system parameters. The system considered for this study has LiCoO2–LiC6 battery chemistry. |
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