Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 158, Issue 10, Pages A1100-A1105Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3622348
Keywords
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Funding
- US Army [US001-0000245070]
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Two ionic liquids, EMI-AlCl4 and N-1114-TFSI, that support both lithium and sodium deposition/dissolution were studied as potential electrolytes for lithium metal batteries. In both cases, lithium's dendritic growth was suppressed by adding a small amount of sodium to a lithium electrolyte. This results in a co-deposition or alloying process that hinders dendrite growth. SEM images show a significant difference in morphology obtained by the addition of sodium. A smooth deposit was not enough for stable cycling of the lithium anode because of lithium's reactivity with the electrolyte. Vinylene carbonate (VC) was added to the N-1114-TFSI to form a stable SEI layer. Cyclic voltammetry and chronopotentiometry was carried out on tungsten and stainless steel electrodes to obtain efficiency measurements. The combination of a small amount of sodium in the electrolyte, along with VC as an SEI former, lead to significant improvements in cycling performance and efficiency. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3622348] All rights reserved.
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