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>> This study examined the electrochemical deposition and dissolution of lithium on nickel electrodesin 1 mol dm -3 (M) LiPF 6 dissolved in propylene carbonate (PC) containing different 1,2-dimethoxyethane (DME)concentrations as a co-solvent. The DME concentration was found to have a significant effect on the reactions occurring at the electrode. The poor cycleability of the electrodes in the pure PC solution was improved considerablyby adding small amounts of DME. This results suggested that the dendritic lithium growth could be suppressedby using co-solvents. After hundredth cycling in the 1 M LiPF 6 / PC:DME (67:33) solution, almost no dead lithiumhas been found from the disassembled cell, resulting from suppression of dendritic lithium growth. Scanning electronmicroscopy revealed that dendritic lithium formation was greatly affected by the ratio of DME. Raman spectroscopyresults suggested that the structure of solvated lithium ions is a crucial important factor in suppressing dendriticlithium formation.Key words : Dendritic lithium( ), Co-solvent(), Solvation structure( ), Solvationnumber( ), Interfacial reaction( ), Negative electrode()

Effects of Co-solvent on Dendritic Lithium Growth Reaction