High Lithium Metal Cycling Efficiency in a Room-Temperature Ionic Liquid

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Abstract
A room-temperature ionic liquid (RTIL) solvent, N-methyl, N-alkyl pyrrolidinium bis(trifluoromethanesulfonyl)amide has been investigated for use in a lithium metal battery. An average cycling efficiency of >99% is achieved at on platinum. At deposition rates up to optical micrographs indicate that the deposit is uniform and nondendritic. Above the deposit becomes dendritic and efficiency decays. High cycling efficiency can also be obtained on copper, but at relatively low current density The deposition/cycling history also influences the cycling behavior of the deposit. © 2004 The Electrochemical Society. All rights reserved.