Microscale Discrete Element Method Simulation of the Carbon Black Aggregate Fracture Behavior in a Simple Shear Flow,Energy Technology

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Microscale Discrete Element Method Simulation of the Carbon Black Aggregate Fracture Behavior in a Simple Shear Flow
Energy Technology ( IF 3.6 ) Pub Date : 2021-01-14 , DOI: 10.1002/ente.202000850
Ermek Asylbekov ₁ , Robin Trunk ₁ , Mathias J. Krause ₁ , Hermann Nirschl ₁

Affiliation

The shear stress induced breaking behavior of carbon black (CB) aggregates during the manufacturing process of Li-ion batteries is investigated via microscale discrete element method (DEM) simulations. The relevant range of shear stress is chosen according to a planetary mixer and cathode slurries with high solid content. Aggregates of different sizes and shapes are modeled using a self-written algorithm based on the tunable dimension method. Then, suitable models are chosen for representing the solid bridges between the primary particles of the CB aggregates and relevant fluid forces. The results show a correlation between aggregate size and critical shear stress which is required to initiate aggregate fracturing. Furthermore, a change in aggregate shape is linked to applied stress and initial aggregate size and shape. Hence, a recommendation for an efficient disintegration of CB aggregates during the mixing process is made.

中文翻译：

简单剪切流中炭黑骨料断裂行为的微尺度离散元方法模拟

通过微尺度离散元法 (DEM) 模拟研究了锂离子电池制造过程中炭黑 (CB) 聚集体的剪切应力诱导断裂行为。根据行星式混合器和具有高固体含量的阴极浆料来选择相关的剪切应力范围。使用基于可调维数方法的自编算法对不同大小和形状的聚集体进行建模。然后，选择合适的模型来表示 CB 聚集体的初级粒子与相关流体力之间的实体桥。结果显示了集料尺寸和临界剪切应力之间的相关性，这是引发集料压裂所需的。此外，骨料形状的变化与施加的应力和初始骨料尺寸和形状有关。因此，

更新日期：2021-01-14

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