리튬 덴드라이트의 성장 반응에 미치는 공용매의 영향 (Effects of Co-solvent on Dendritic Lithium Growth Reaction)

서지정보

· 발행기관 : 한국수소및신에너지학회
· 수록지 정보 : 한국수소및신에너지학회논문집 / 24권 / 2호 / 172 ~ 178페이지
· 저자명 : 강지훈, 정순기

초록

This study examined the electrochemical deposition and dissolution of lithium on nickel electrodes in 1 mol dm-3(M) LiPF6 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 LiPF6 / 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.

영어초록

This study examined the electrochemical deposition and dissolution of lithium on nickel electrodes in 1 mol dm-3(M) LiPF6 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 LiPF6 / 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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