气候变化领域集成服务门户(CCPortal): Concentration polarization and metal dendrite initiation in isolated electrolyte microchannels

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DOI	10.1039/d0ee01874k
	Concentration polarization and metal dendrite initiation in isolated electrolyte microchannels
	Lee Y.; Ma B.; Bai P.
发表日期	2020
ISSN	1754-5692
起始页码	3504
结束页码	3513
卷号	13 期号:10
英文摘要	Lithium metal penetrations through the liquid-electrolyte-wetted porous separator and solid electrolytes are a major safety concern of next-generation rechargeable metal batteries. Penetrations were frequently discovered to occur through only a few isolated channels, as revealed by "black spots"on both sides of the separator or electrolyte, which manifest a highly localized ionic flux or current density. Predictions of the penetration time have been difficult due to the hidden and unclear dynamics in these penetration channels. Here, using glass capillary cells, we investigate for the first time the unexpectedly sensitive influence of channel geometry on the concentration polarization and dendrite initiation processes. The characteristic time for the complete depletion of salt concentration at the surface of the advancing electrode, i.e. Sand's time, exhibits a nonlinear dependence on the curvature of the channel walls along the axial direction. While a positively deviated Sand's time scaling exponent can be used to infer a converging penetration area through the electrolyte, a negatively deviated scaling exponent suggests that diffusion limitations can be avoided in expanding channels, such that the fast-advancing tip-growing dendrites will not be initiated. The safety design of rechargeable metal batteries will benefit from considering the true local current densities and the conduction structures. © The Royal Society of Chemistry.
语种	英语
scopus关键词	Dendrites (metallography); Lithium batteries; Polarization; Separators; Solid electrolytes; Solid-State Batteries; Characteristic time; Concentration polarization; Diffusion limitations; Initiation process; Liquid electrolytes; Local current density; Nonlinear dependence; Salt concentration; Metals
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162590
作者单位	Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, 1 Brookings Drive, St. Louis, MO 63130, United States; Institute of Materials Science and Engineering, Washington University in St. Louis, 1 Brookings Drive, St. Louis, MO 63130, United States
推荐引用方式 GB/T 7714	Lee Y.,Ma B.,Bai P.. Concentration polarization and metal dendrite initiation in isolated electrolyte microchannels[J],2020,13(10).
APA	Lee Y.,Ma B.,&Bai P..(2020).Concentration polarization and metal dendrite initiation in isolated electrolyte microchannels.Energy and Environmental Science,13(10).
MLA	Lee Y.,et al."Concentration polarization and metal dendrite initiation in isolated electrolyte microchannels".Energy and Environmental Science 13.10(2020).