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http://dx.doi.org/10.7316/KHNES.2013.24.2.172

Effects of Co-solvent on Dendritic Lithium Growth Reaction  

Kang, Jihoon (Department of Chemical Engineering, Soonchunhyang University)
Jeong, Soonki (Department of Chemical Engineering, Soonchunhyang University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.24, no.2, 2013 , pp. 172-178 More about this Journal
Abstract
This study examined the electrochemical deposition and dissolution of lithium on nickel electrodes in 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 considerably by adding small amounts of DME. This results suggested that the dendritic lithium growth could be suppressed by using co-solvents. After hundredth cycling in the 1 M $LiPF_6$/PC:DME (67:33) solution, almost no dead lithium has been found from the disassembled cell, resulting from suppression of dendritic lithium growth. Scanning electron microscopy revealed that dendritic lithium formation was greatly affected by the ratio of DME. Raman spectroscopy results suggested that the structure of solvated lithium ions is a crucial important factor in suppressing dendritic lithium formation.
Keywords
Dendritic lithium; Co-solvent; Solvation structure; Solvation number; Interfacial reaction; Negative electrode;
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Times Cited By KSCI : 1  (Citation Analysis)
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