Understanding thermal and mechanical effects on lithium plating in lithium-ion batteries
Understanding thermal and mechanical effects on lithium plating in lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2022.231632
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发表时间：
2022-09
影响因子：
9.2
通讯作者：
Yitao Qiu;Xiaoxuan Zhang;Camille Usubelli;Daniel Mayer;C. Linder;Jake Christensen
中科院分区：
文献类型：
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作者：
Yitao Qiu;Xiaoxuan Zhang;Camille Usubelli;Daniel Mayer;C. Linder;Jake Christensen
锂电镀是电池耐久性的主要关注点之一，因为可循环锂和电池容量在该过程中降低。热负荷和机械负荷可以影响电池行为，包括锂电镀驱动力，如分别由Arkenius方程和Bruggeman关系所表明的。因此，一个1D和一个3D模型，研究在锂离子电池与高面积容量（4 mAh/cm 2）的锂电镀的热和机械效应。1D模型假设均匀的机械和温度分布，而3D模型能够捕获单元中应力和温度的不均匀性。研究了机械变形和不同温度对镀锂过程的影响。在一维充电模拟的帮助下，观察到较低的温度增加了锂电镀的风险，并且机械变形的存在可以加速其引发。此外，3D充电模拟表明，由于较高的应力集中和较低的温度，折叠和边界的双金属卷更容易受到锂电镀。
Lithium plating is one of the main concerns for cell durability, as cyclable lithium and cell capacity are decreased during the process. Thermal and mechanical loads can influence cell behavior, including lithium plating driving forces, as suggested by the Arrhenius equation and the Bruggeman relation, respectively. Hence, a 1D and a 3D model are employed to study the thermal and mechanical effects on lithium plating in a lithium-ion battery with a high areal capacity (4 mAh/cm 2). The 1D model assumes uniform mechanical and temperature profile, while the 3D model is capable of capturing the nonuniformity of stress and temperature in the cell. The effects of mechanical deformation and different temperatures on the process of lithium plating are investigated in this study. With the help of the 1D charging simulations, it is observed that lower temperatures increase the risk of lithium plating and the presence of mechanical deformations can accelerate its initiation. Furthermore, 3D charging simulations indicated that folds and boundaries of jellyrolls are more susceptible to lithium plating due to the higher stress concentration and lower temperature, respectively.