Understanding Deviations between Spatially Resolved and Homogenized Cathode Models of Lithium-Ion Batteries,Energy Technology

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Understanding Deviations between Spatially Resolved and Homogenized Cathode Models of Lithium-Ion Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2020-12-09 , DOI: 10.1002/ente.202000881
Adrian Schmidt ₁ , Elvedin Ramani ₁ , Thomas Carraro ₂ , Jochen Joos ₁ , André Weber ₁ , Marc Kamlah ₃ , Ellen Ivers-Tiffée ₁

Affiliation

Porous electrode models are essential for inexpensively predicting the performance and lifetime of lithium-ion batteries. Physics-based models range from microscopic 3D models, which spatially resolve the microstructural characteristics of all phases in porous electrodes, to reduced and computationally effective models, which do not resolve the microstructure. The homogenized Newman model, also known as the pseudo-2D (P2D) model, is well established and widely used. However, the necessary simplification shows its weaknesses, especially for high charge and discharge rates, and these lead to significant differences in comparison with the microscopic 3D model. Herein, the validity of the homogenized Newman model is investigated with respect to variations of the microstructural characteristics of a porous cathode. The effects of 1) a homogenized conductive additive; 2) non-spherical particle geometries; and 3) overlapping particles on charge/discharge curves are analyzed. The result is a better understanding of the validity limits of P2D models. These new insights about the individual influences of the simplifications will be used to improve the homogenized model. The simulation of complex cathode structures, where several homogenization assumptions are violated, shows that the improved homogenized model reaches a very high accuracy, and, thus, overcomes the existing limitations of the P2D model approach.

中文翻译：

了解锂离子电池空间分辨和均质阴极模型之间的偏差

多孔电极模型对于廉价地预测锂离子电池的性能和寿命至关重要。基于物理的模型包括从空间解析多孔电极中所有相的微观结构特征的微观 3D 模型到不解析微观结构的简化和计算有效的模型。均质纽曼模型，也称为伪 2D (P2D) 模型，已被广泛使用。然而，必要的简化显示了它的弱点，特别是对于高充电和放电率，这些导致与微观 3D 模型相比存在显着差异。在此，针对多孔阴极微观结构特征的变化，研究了均质纽曼模型的有效性。1）均质导电助剂的作用；2) 非球形颗粒几何形状；3) 分析充电/放电曲线上的重叠粒子。结果是更好地理解 P2D 模型的有效性限制。这些关于简化的个体影响的新见解将用于改进同质化模型。复杂阴极结构的模拟，其中违反了几个均质化假设，表明改进的均质化模型达到了非常高的精度，因此克服了 P2D 模型方法的现有局限性。这些关于简化的个体影响的新见解将用于改进同质化模型。复杂阴极结构的模拟，其中违反了几个均质化假设，表明改进的均质化模型达到了非常高的精度，因此克服了 P2D 模型方法的现有局限性。这些关于简化的个体影响的新见解将用于改进同质化模型。复杂阴极结构的模拟，其中违反了几个均质化假设，表明改进的均质化模型达到了非常高的精度，因此克服了 P2D 模型方法的现有局限性。

更新日期：2020-12-09

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