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New Reduced-Order Lithium-Ion Battery Model to Account for the Local Fluctuations in the Porous Electrodes
Energy Technology ( IF 3.8 ) Pub Date : 2020-12-08 , DOI: 10.1002/ente.202000861
Igor Traskunov 1, 2, 3 , Arnulf Latz 1, 2, 3
Affiliation  

Numerical simulations of microscopic transport processes in porous electrodes of lithium-ion batteries demonstrate the presence of spatially localized fluctuations of physical quantities on the microstructure scale. They can influence the macroscopic battery characteristics (for example, the degradation rates). These fluctuations cannot be captured in a straightforward manner by the widely used porous electrode theory by Doyle, Fuller, and Newman (DFN model). The latter treats the porous electrodes as macroscopically homogeneous composite materials; it reduces the computational costs of numerical simulations. Herein, a modification of the DFN model that incorporates the local fluctuations but preserves the computational efficiency is proposed. Numerical simulation examples are presented that test the accuracy of the reproduction of the local fluctuations. The main new feature lies in the mathematical representation of the slow transport processes in the active material and their influence on the macroscopic reaction rates. The model is rooted in the rigorous mathematical analysis of the transition from a microscopic, microstructure-resolving transport and reaction description to a macroscopic, volume averaging-based one. The model construction methodology is open for further modifications for the applications in which some of the assumptions should be dropped, or description of new processes, reactions, phases, etc. should be incorporated.

中文翻译:

考虑多孔电极局部波动的新型降阶锂离子电池模型

锂离子电池多孔电极中微观传输过程的数值模拟表明,在微观结构尺度上存在物理量的空间局部波动。它们会影响宏观电池特性(例如,降解率)。Doyle、Fuller 和 Newman 广泛使用的多孔电极理论(DFN 模型)无法以直接的方式捕获这些波动。后者将多孔电极视为宏观均质的复合材料;它降低了数值模拟的计算成本。在此,提出了结合局部波动但保留计算效率的 DFN 模型的修改。给出了数值模拟实例来测试局部波动再现的准确性。主要的新特征在于活性材料中慢传输过程的数学表示及其对宏观反应速率的影响。该模型植根于对从微观、微观结构解析传输和反应描述到宏观、基于体积平均的传输和反应描述转变的严格数学分析。模型构建方法对应用程序的进一步修改开放,其中一些假设应该被删除,或者新过程、反应、阶段等的描述应该被合并。主要的新特征在于活性材料中慢传输过程的数学表示及其对宏观反应速率的影响。该模型植根于对从微观、微观结构解析传输和反应描述到宏观、基于体积平均的传输和反应描述转变的严格数学分析。模型构建方法对应用程序的进一步修改开放,其中一些假设应该被删除,或者新过程、反应、阶段等的描述应该被合并。主要的新特征在于活性材料中慢传输过程的数学表示及其对宏观反应速率的影响。该模型植根于对从微观、微观结构解析传输和反应描述到宏观、基于体积平均的传输和反应描述转变的严格数学分析。模型构建方法对应用程序的进一步修改开放,其中一些假设应该被删除,或者新过程、反应、阶段等的描述应该被合并。
更新日期:2020-12-08
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