Heterogeneities Affect Solid-State Battery Cathode Dynamics
Heterogeneities Affect Solid-State Battery Cathode Dynamics
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DOI：
10.1016/j.ensm.2022.11.055
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发表时间：
2022-12
影响因子：
20.4
通讯作者：
K. Naik;B. Vishnugopi;P. Mukherjee
中科院分区：
文献类型：
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作者：
K. Naik;B. Vishnugopi;P. Mukherjee
与传统锂离子电池相比，固态电池有望提高能量和功率密度。在固态电池面临的无数界面和机械挑战中，由于潜在的微观结构异质性而导致的复合阴极结构构成了关键瓶颈。固-固点接触和离子/电子渗流路径的空间变异性支配着潜在的反应-输运二分法，并最终影响时空动力学。在这项工作中，我们假设中尺度相互作用的内在作用，并描绘如何深刻地影响异质性的时空演变的热电化学动力学受到物理和操作的极端。本研究批判性地研究了固-固点接触在热电化学热点形成、插层级联和反应电流局部化中表现为奇异性的重要性，并将其作为未来开发改进的固态电池阴极架构时考虑的机械痛点。
Solid-state batteries hold the promise to improve energy and power densities compared to conventional lithium-ion batteries. Among myriad interface and mechanistic challenges plaguing the solid-state batteries, the composite cathode architecture owing to the underlying microstructural heterogeneity poses a critical bottleneck. The spatial variability of solid-solid point contacts and ionic/electronic percolation pathways govern the underlying reaction-transport dichotomy, and ultimately affect the spatio-temporal dynamics. In this work, we postulate the inherent role of mesoscale interactions and delineate how heterogeneities profoundly affect the spatio-temporal evolution of thermo-electrochemical dynamics subject to physical and operational extremes. This study critically examines the importance of solid-solid point contacts manifesting as singularities in thermo-electrochemical hotspot formation, intercalation cascade, and reaction current localization and establishes these as mechanistic pain points for consideration in the future development of improved solid-state battery cathode architectures.