The incorporation of ceramics into polymers, forming solid composite electrolytes (SCEs) leads to enhanced electrical performance of all-solid-state lithium metal batteries. This is because the dispersed ceramics particles increase the ionic conductivity, while the polymer matrix leads to better contact performance between the electrolyte and the electrode. In this study, we present a model, based on Hybrid Elements Methods, for the time-dependent Li metal and SCE rough interface mechanics, taking into account for the oxide (ceramics) inclusions (using the Equivalent Inclusion method), and the viscoelasticity of the matrix. We study the effect of LLTO particle size, weight concentration, and spatial distribution on the interface mechanical and electrical response. Moreover, considering the viscoelastic spectrum of a real PEO matrix, under a given stack pressure, we investigate the evolution over time of the mechanical and electrical performance of the interface. The presented theoretical/numerical model might be pivotal in tailoring the development of advanced solid state batteries with superior performance; indeed, we found that conditions in the SCE mixture which optimize both the contact resistivity and the interface stability in time.

中文翻译：

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固态锂金属电池中陶瓷聚合物复合电解质的界面性能演变


将陶瓷融入聚合物中，形成固体复合电解质（SCE），可以增强全固态锂金属电池的电气性能。这是因为分散的陶瓷颗粒增加了离子电导率，而聚合物基体导致电解质和电极之间更好的接触性能。在这项研究中，我们提出了一个基于混合元素方法的模型，用于时间相关的锂金属和 SCE 粗糙界面力学，考虑了氧化物（陶瓷）夹杂物（使用等效夹杂物方法）和粘弹性。矩阵。我们研究了 LLTO 颗粒尺寸、重量浓度和空间分布对界面机械和电响应的影响。此外，考虑到真实 PEO 基质的粘弹性谱，在给定的堆压力下，我们研究了界面的机械和电气性能随时间的演变。所提出的理论/数值模型可能对于开发具有卓越性能的先进固态电池至关重要；事实上，我们发现 SCE 混合物中的条件可以及时优化接触电阻率和界面稳定性。