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A Reduced-Order Model of Lithium–Sulfur Battery Discharge

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Publicado en:Batteries vol. 11, no. 1 (2025), p. 15
Autor principal: Haddad, Noushin
Otros Autores: Fathy, Hosam K
Publicado:
MDPI AG
Materias:
Discharge
Simulation
Accuracy
Electrolytes
Physics
Reduced order models
Specific energy
Electrodes
Oxidation
State space models
State variable
Variables
Sulfur
Diffusion rate
Batteries
Electrochemistry
Optimal control
Dimensional analysis
Lithium sulfur batteries
Lithium
Composite materials
Energy levels
Acceso en línea:Citation/Abstract
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Resumen:This paper examines the problem of modeling lithium–sulfur (Li-S) battery discharge dynamics. The importance of this problem stems from the attractive specific energy levels achievable by Li-S batteries, which can be particularly appealing for applications such as aviation electrification. Previous research presents different Li-S battery models, including “zero-dimensional” models that neglect diffusion while using the laws of electrochemistry to represent reduction–oxidation (redox) rates. Zero-dimensional models typically succeed in capturing key features of Li-S battery discharge, including the high plateau, low plateau, and dip point visible in the discharge curves of certain Li-S battery chemistries. However, these models’ use of one state variable to represent the mass of each active species tends to furnish high-order models, with many state variables. This increases the computational complexity of model-based estimation and optimal control. The main contribution of this paper is to develop low-order state-space model of Li-S battery discharge. Specifically, the paper starts with a seventh-order zero-dimensional model of Li-S discharge dynamics, analyzes its discharge behavior, constructs phenomenological second- and third-order models capable of replicating this behavior, and parameterizes these models. The proposed models succeed in capturing battery discharge behavior accurately over a wide range of discharge rates. To the best of our knowledge, these are two of the simplest published models capable of doing so.
ISSN:2313-0105
DOI:10.3390/batteries11010015
Fuente:Advanced Technologies & Aerospace Database