Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 7, Pages 3999-4006Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta10929c
Keywords
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Funding
- Shell
- Welch Foundation [F-1131, F-1436]
- National Science Foundation [CBET-1603491]
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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.
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