Understanding the Selective Deposition of Li Metal on Nonuniform Electrode Surfaces Using Atomic Force Microscopy

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The use of lithium metal in secondary batteries has been impeded by its tendency to form dendrites: branching conductive structures of metal that can lead to capacity loss and, ultimately, internal shorts in the battery. Patterned electrodes, in addition to artificially increasing the current density of cells by increasing the surface area available for reaction, also generate a nonuniform electric field in the vicinity of the electrode surface. This nonuniform electric field, though rapidly screened by the electrolyte, can promote inhomogeneous deposition and Solid Electrolyte Interphase formation. As the consequence of these effects is not theoretically apparent since Solid Electrolyte Interphase volume and conductivity changes can, in principle, offset variations in local current density, we have performed experiments to examine the deposition of Li on nonuniform electrode surfaces using Atomic Force Microscopy. We measure the local variations in topography, SEI thickness, and composition, and discuss their implications for the formation of dendrites in Li metal.
Publisher
ELECTROCHEMICAL SOC INC
Issue Date
2021-02
Language
English
Article Type
Article
Citation

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.168, no.2

ISSN
0013-4651
DOI
10.1149/1945-7111/abe3f0
URI
http://hdl.handle.net/10203/281594
Appears in Collection
MS-Journal Papers(저널논문)
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