Journal
JOURNAL OF MATERIALS RESEARCH
Volume 36, Issue 4, Pages 797-811Publisher
SPRINGER HEIDELBERG
DOI: 10.1557/s43578-020-00047-8
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Funding
- Center for Synthetic Control Across Length-scales for Advancing Rechargeables (SCALAR), an Energy Frontier Research Center - United States Department of Energy, Office of Science, Basic Energy Sciences [DESC0019381]
- University of Chinese Academy of Sciences
- National Science Foundation [ECCS-1542148, ACI-1548562, TG-CHE170060]
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The study examines a novel approach of using Li-Sn intermetallic as an interfacial coating to control lithium deposition, leading to improved morphology and suppression of lithium dendrite formation. Results demonstrate better charge transfer kinetics and higher Li exchange current with this method.
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.
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