Effect of zwitterion on the lithium solid electrolyte interphase in ionic liquid electrolytes

Byrne, N. and Howlett, Patrick C. and Macfarlane, Douglas R. and Smith, Mark E. and Howes, Andrew P. and Hollenkamp, A. F. and Bastow, T. J. and Hale, P. and Forsyth, Maria (2008) Effect of zwitterion on the lithium solid electrolyte interphase in ionic liquid electrolytes. Journal of Power Sources, 184 (1). pp. 288-296.

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Abstract

An understanding of the solid electrolyte interphase (SEI) that forms on the lithium-metal surface is essential to the further development of rechargeable lithium-metal batteries. Currently, the formation of dendrites during cycling, which can lead to catastrophic failure of the cell, has mostly halted research on these power sources. The discovery of ionic liquids as electrolytes has rekindled the possibility of safe, rechargeable, lithium-metal batteries. The current limitation of ionic liquid electrolytes, however, is that when compared with conventional non-aqueous electrolytes the device rate capability is limited. Recently, we have shown that the addition of a zwitterion such as N-methyl-N-(butyl sulfonate) pyrrolidinium resulted in enhancement of the achievable current densities by 100%. It was also found that the resistance of the SEI layer in the presence of a zwitterion is 50% lower. In this study, a detailed chemical and electrochemical analysis of the SEI that forms in both the presence and absence of a zwitterion has been conducted. Clear differences in the chemical nature and also the thickness of the SEI are observed and these may account for the enhancement of operating current densities.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Power Sources
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2105
Subjects:
Departments:
ID Code:
65111
Deposited By:
Deposited On:
07 Jun 2013 13:11
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jan 2020 07:38