Accession Number : ADA556756


Title :   Dendrite-Free Electrodeposition and Reoxidation of Lithium-Sodium Alloy for Metal-Anode Battery


Descriptive Note : Journal article preprint


Corporate Author : GEORGIA INST OF TECHNOLOGY ATLANTA GA SCHOOL OF CHEMICAL AND BIOMOLECULAR ENGINEERING


Personal Author(s) : Star, Johanna K ; Ding, Yi ; Kohl, Paul A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a556756.pdf


Report Date : 01 Nov 2011


Pagination or Media Count : 23


Abstract : Two ionic liquids, EMI-AlCl4 and N1114-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 N1114-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.


Descriptors :   *ELECTRIC BATTERIES , ELECTRODEPOSITION , ELECTROLYTES , LITHIUM , SODIUM


Subject Categories : Electrochemical Energy Storage


Distribution Statement : APPROVED FOR PUBLIC RELEASE