Safety and performance of lithium-ion batteries over a wide temperature window are of paramount importance, especially for electric vehicles. The safety concerns are predicated on the thermal behavior as the occurrence of local temperature excursions may lead to thermal runaway. In this work, the role of electrode microstructure and implications on the cell thermal behavior are examined. A microstructure-aware electrochemical-thermal coupled model has been proposed, which delineates the electrode-level thermal complexations due to the structure-transport-electrochemistry interactions. Detailed analysis of the spatio-temporal variation of the heat generation rates (ohmic, reaction and reversible contributions) for different electrode microstructural configurations is presented to explain the dominant factors causing temperature rise. The tradeoff between the cell performance and safety is discussed from an electrode-level, bottom-up view point. This study aims to provide valuable insights into potentially tuning electrode-level structural features as an internal safety switch toward limiting the Li-ion cell temperature rise during operation.

中文翻译：

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探究电极微结构在锂离子电池热行为中的作用

锂离子电池在宽温度范围内的安全性和性能至关重要，尤其是对于电动汽车而言。安全问题是基于热行为，因为局部温度偏移的发生可能导致热失控。在这项工作中，检查了电极微结构的作用以及对电池热行为的影响。提出了一种微结构感知的电化学-热耦合模型，该模型描述了由于结构-传输-电化学相互作用而产生的电极级热络合物。给出了针对不同电极微结构构型的生热速率（欧姆，反应和可逆贡献）的时空变化的详细分析，以解释引起温度升高的主要因素。从电极级别的，自下而上的角度讨论了电池性能和安全性之间的折衷。这项研究旨在为潜在的调节电极级结构特征提供有价值的见解，作为内部安全开关，以限制运行期间锂离子电池的温度升高。