Modeling Effective Ionic Conductivity and Binder Influence in Composite Cathodes for All-Solid-State Batteries
Modeling Effective Ionic Conductivity and Binder Influence in Composite Cathodes for All-Solid-State Batteries
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DOI：
10.1021/acsami.9b22788
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发表时间：
2020-03-18
影响因子：
9.5
通讯作者：
Janek, Juergen
中科院分区：
文献类型：
--
作者：
Bielefeld, Anja;Weber, Dominik A.;Janek, Juergen
在追求未来移动性的过程中，固态电池开辟了一个广泛的有前途的电池概念，具有各种优势，从能量密度到功率能力。然而，需要解决权衡问题，特别是对于大规模、成本有效的加工，这意味着在复合电极中使用聚合物粘合剂。在这里，研究活性材料、固体电解质和粘合剂的三维微观结构模型，以将阴极设计和粘合剂含量与电极性能联系起来。专注于锂离子传输，我们评估了有效的离子电导率和曲折度在基于通量的模拟。其中，我们解决了电极组成和活性材料颗粒尺寸以及空隙空间和粘合剂含量的工艺控制设计参数的影响。即使少量添加，后者对离子传输路径和活性表面积具有强烈的负面影响。四相复合材料内的离子输运的模拟补充的极限电流密度的估计，说明应用驱动的电池设计开始在微观结构水平。
In the pursuit for future mobility, solid-state batteries open a wide held of promising battery concepts with a variety of advantages, ranging from energy density to power capability. However, trade-offs need to be addressed, especially for large-scale, cost-effective processing, which implies, the use of a polymeric binder in the composite electrodes. Here, investigate three-dimensional microstructure models of the active material, solid electrolyte, and binder to link cathode design and binder content with electrode performance. Focusing on lithium-ion transport, we evaluate the effective ionic conductivity and tortuosity in a flux-based simulation. Therein, we address the influence of electrode composition and active material particle size as well as the process-controlled design parameters of the void space and binder content. Even though added in small amounts, the latter has a strong negative influence on the ion transport paths and the active surface area. The simulation of ion transport within four-phase composites is supplemented by an estimation of the limiting current densities, illustrating that application-driven cell design starts at the microstructure level.