Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effects of Co-solvent on Dendritic Lithium Growth Reaction

리튬 덴드라이트의 성장 반응에 미치는 공용매의 영향

  • Kang, Jihoon (Department of Chemical Engineering, Soonchunhyang University) ;
  • Jeong, Soonki (Department of Chemical Engineering, Soonchunhyang University)
  • 강지훈 (순천향대학교 나노화학공학과) ;
  • 정순기 (순천향대학교 나노화학공학과)
  • Received : 2013.04.01
  • Accepted : 2013.04.26
  • Published : 2013.04.30
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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.

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References

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  1. Electrochemical Redox Reactions of Lithium Ion on Nickel Electrode in Propylene Carbonate-Based Solutions vol.900, pp.1662-9752, 2017, https://doi.org/10.4028/www.scientific.net/MSF.900.93