期刊
NANO LETTERS
卷 22, 期 20, 页码 8224-8232出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02792
关键词
lithium metal battery; fast charging; charge transfer; dendrite prevention; plating mechanism
类别
资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the US Department of Energy under the Battery Materials Research (BMR) Program and Battery 500 Consortium
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-AC02-76SF00515]
- National Science Foundation Graduate Research Fellowship Program
- National Science Foundation [CBET-2143677, ECCS-1542152]
The poor fast-charge capabilities of rechargeable Li metal anodes are limited by the current-dependent regimes of Li plating mechanisms and morphology. Understanding how high currents lead to detrimental morphology and poor cyclability can help prevent SEI-breakdown and slow ion transport, informing further electrolyte engineering and customization of fast-charging protocols for Li metal batteries.
Poor fast-charge capabilities limit the usage of rechargeable Li metal anodes. Understanding the connection between charging rate, electroplating mechanism, and Li morphology could enable fast-charging solutions. Here, we develop a combined electroanalytical and nanoscale characterization approach to resolve the current-dependent regimes of Li plating mechanisms and morphology. Measurement of Li+ transport through the solid electrolyte interphase (SEI) shows that low currents induce plating at buried Li parallel to SEI interfaces, but high currents initiate SEI-breakdown and plating at fresh Li parallel to electrolyte interfaces. The latter pathway can induce uniform growth of {110}-faceted Li at extremely high currents, suggesting ion-transport limitations alone are insufficient to predict Li morphology. At battery relevant fast-charging rates, SEI-breakdown above a critical current density produces detrimental morphology and poor cyclability. Thus, prevention of both SEI-breakdown and slow ion-transport in the electrolyte is essential. This mechanistic insight can inform further electrolyte engineering and customization of fast-charging protocols for Li metal batteries.
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