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Separator-free and concentrated LiNO3 electrolyte cells enable uniform lithium electrodeposition

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Abstract

Imaging of lithium electrodepositions revealed that in the absence of a compressed porous separator, achieved via a plastic washer, dendrite-free lithium was deposited from glyme solutions of 1 M LiNO3. When the 1 M LiNO3 in glyme was coupled with a 1 M LiFSI salt, high coulombic efficiencies were also attainable in both Li|Cu and anode-free LFP|Cu cells. However, dendrite resurgence was observed in cycled lithium coin cell electrodes when a porous separator was utilized. This was attributed to the restriction of Li+ flux to the electrode surface induced by the porous and tortuous structure of the polymer separator. At these pores, localized current densities, which exceeded the applied current density, and a non-uniform Li+ flux resulted in dendritic lithium growth. Replacement of the separator by a washer normalized the current distribution and provided for non-dendritic lithium deposits in coin cells.

Graphical abstract: Separator-free and concentrated LiNO3 electrolyte cells enable uniform lithium electrodeposition

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Supplementary files

Article information


Submitted
03 Oct 2019
Accepted
27 Jan 2020
First published
28 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Separator-free and concentrated LiNO3 electrolyte cells enable uniform lithium electrodeposition

R. Rodriguez, R. A. Edison, R. M. Stephens, H. Sun, A. Heller and C. B. Mullins, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA10929C

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