Computer simulations of the impedance response of lithium rechargeable batteries
A mathematical model is developed to simulate the impedance response of a wide range of lithium rechargeable battery systems. The mathematical model is a macroscopic model of a full-cell sandwich utilizing porous electrode theory to treat the electrode region and concentrated solution theory for tra...
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Published in | Journal of the Electrochemical Society Vol. 147; no. 1; pp. 99 - 110 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Pennington, NJ
Electrochemical Society
2000
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Subjects | |
Online Access | Get full text |
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Summary: | A mathematical model is developed to simulate the impedance response of a wide range of lithium rechargeable battery systems. The mathematical model is a macroscopic model of a full-cell sandwich utilizing porous electrode theory to treat the electrode region and concentrated solution theory for transport processes in solution. Insertion processes are described with charge-transfer kinetic expressions and solid-phase diffusion of lithium into the active electrode material. The impedance model assumes steady-state conditions and a linear response with the perturbation applied about the open-circuit condition for the battery. The simulated impedance response of a specific system, the lithium-polymer cell Li{vert{underscore}bar}PEO{sub 18}LiCF{sub 3}So{sub 3}{vert{underscore}bar}LiTiS{sub 2}, is analyzed in more detail to illustrate several features of the impedance behavior. Particular attention is paid to the measurement of solid-phase lithium-ion diffusion coefficients in the insertion electrodes using impedance techniques. A number of complications that can lead to errors in diffusion-coefficient measurements based on impedance techniques are discussed. |
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Bibliography: | USDOE AC03-76SF00098 |
ISSN: | 0013-4651 1945-7111 |
DOI: | 10.1149/1.1393162 |