Reducing Dendrite Growth in Lithium Metal Batteries by Creeping Poiseuille and Couette Flows
Reducing Dendrite Growth in Lithium Metal Batteries by Creeping Poiseuille and Couette Flows
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DOI：
10.1149/1945-7111/abcf55
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发表时间：
2020-12
影响因子：
3.9
通讯作者：
Mihir N. Parekh;C. Rahn
中科院分区：
文献类型：
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作者：
Mihir N. Parekh;C. Rahn
锂金属电池中的枝晶由于金属电沉积期间的不稳定性而生长。本文推导了平行于两电极的坡埃维尔流和库埃特流电沉积的解析模型。模型预测，平行于金属电极表面的蠕变电解液流动通过降低枝晶生长速率来增加锂电镀的稳定性。此外，平行流动减小了枝晶的曲率，导致更平坦的电沉积物，因此枝晶不太可能穿透分离器或使固体电解质界面（SEI）破裂。对于相同的平均流量，Poiffille流可以比Couette流稳定两倍。然而，平行流必须比正常流高许多数量级，才能类似地减少不稳定性。也不可能用蠕动平行流完全稳定金属电极。
Dendrites in lithium metal batteries grow due to instabilities during metal electrodeposition. This paper derives analytical models for electrodeposition with creeping Poiseuille and Couette flows parallel to the two electrodes. The models predict that creeping electrolyte flow parallel to the surface of metal electrode increases the stability of lithium plating by reducing the dendrite growth rate. Moreover, parallel flow reduces the curvature of dendrites leading to flatter electrodeposits, so the dendrites are less likely to penetrate the separator or fracture the Solid Electrolyte Interphase (SEI). For the same average flow rate, Poiseuille flow can be upto two times more stabilizing than Couette flow. However, parallel flows must be many orders of magnitude higher than normal flows for similar reduction in instability. It is also not possible to completely stabilize the metal electrode with creeping parallel flows.