锂离子电池电化学模型中温度依赖的多尺度动力学

H. Arunachalam, S. Onori, I. Battiato
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引用次数: 10

摘要

在锂离子电池中,扩散、电迁移和非均相反应这三种微尺度输运过程之间的相对重要性可以用无因次电pmaclet (Pe)和Damköhler (Da)数来量化。通过均质化技术,我们将孔隙尺度的泊松-能斯特-普朗克方程提升到宏观尺度,并在(Da,Pe)空间中形成相图,确定了等温电化学宏观模型能够准确描述微观尺度动力学的适用条件[1]。在这项工作中,我们重点研究了温度对一些市售锂离子电池宏观尺度(纽曼型)模型精度的影响。我们发现宏观模型只能在特定的温度范围内准确地表示孔隙尺度动力学,其准确性受到电池工作温度条件的强烈控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature-dependent multiscale-dynamics in Lithium-ion battery electrochemical models
In a Lithium-ion battery, the relative importance between the three microscale transport processes, i.e. diffusion, electromigration and heterogeneous reaction, can be quantified using the dimensionless Electric Péclet (Pe) and Damköhler (Da) numbers. By means of homogenization technique, we upscale the pore-scale Poisson-Nernst-Planck equation to the macroscopic scale and formulate a phase diagram in the (Da,Pe)-space that identifies the applicability conditions under which isothermal electrochemical macroscopic models provide an accurate description of the micro-scale dynamics [1]. In this work, we focus on the effect of temperature on macroscale (Newman-type) models' accuracy for a number of commercially available lithium-ion batteries. We show that macroscopic models are able to accurately represent pore-scale dynamics only within specific temperature bounds and their veracity is strongly controlled by the battery operating temperature conditions.
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