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20201022 Lithium Tin Coating Manuscript for ChemRxiv.pdf (1.43 MB)

Avoiding Dendrite Formation by Confining Lithium Deposition Underneath Li-Sn Coatings

preprint
submitted on 23.10.2020, 04:44 and posted on 23.10.2020, 09:45 by Grace Whang, Qizhang Yan, Da Li, Ziyang Wei, Danielle M. Butts, Philippe Sautet, Jian Luo, Bruce S. dunn

The use of interfacial layers to stabilize the lithium surface is a popular research direction for improving the morphology of deposited lithium and suppressing lithium dendrite formation. This work considers a different approach to controlling dendrite formation where lithium is plated underneath an interfacial coating. In the present research, a Li-Sn intermetallic was chosen as a model system due to its lithium-rich intermetallic phases and high Li diffusivity. These coatings also exhibit a significantly higher Li exchange current than bare Li thus leading to better charge transfer kinetics. The exchange current is instrumental in determining whether lithium deposition occurs above or below the Li-Sn coating. High-resolution transmission electron microscopy and cryogenic focused ion beam scanning electron microscopy were used to identify the features associated with Li deposition. Atomic scale simulations provide insight as to the adsorption energies determining the deposition of lithium below the Li-Sn coating.

Funding

EFRC Center for Synthetic Control Across Length-scales for Advancing Rechargeables (SCALAR)

Basic Energy Sciences

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NNCI: San Diego Nanotechnology Infrastructure (SDNI)

Directorate for Engineering

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History

Email Address of Submitting Author

gwhang@g.ucla.edu

Institution

University of California Los Angeles

Country

United States of America

ORCID For Submitting Author

0000-0003-4185-6043

Declaration of Conflict of Interest

No conflict of interest to declare

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