Why Bis(fluorosulfonyl)imide Is a 鈥淢agic Anion鈥?for Electrochemistry
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- 作者：Ilya A. Shkrob ; Timothy W. Marin ; Ye Zhu ; Daniel P. Abraham
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：August 28, 2014
- 年：2014
- 卷：118
- 期：34
- 页码：19661-19671
- 全文大小：484K
- ISSN：1932-7455
文摘
Ionic liquids consisting of bis(fluorosulfonyl)imide (FSI鈥?/sup>) anion show promise as electrolytes for Li-ion-based electric storage devices, as they exhibit relatively low viscosity, high chemical stability, and form robust solid鈥揺lectrolyte interphase (SEI) protecting liquid electrolyte from further breakdown on the electrode. These ionic liquids have been reported to inhibit dendrite formation on lithium metal and lithiated graphite electrodes, which also relates to the unusual SEI properties. In this study, we examine the chemistry aspects that may account for this behavior. Radiolysis was used to induce redox reactions of FSI鈥?/sup> anions in model systems, and matrix isolation electron paramagnetic resonance was used to identify radical (ion) intermediates generated in these reactions. Our results suggest that qualitative differences between such ionic liquid electrolytes versus common carbonate electrolytes reflect ease of mineralization of the reduced anion without the concurrent generation of organic radicals and/or elimination of gaseous products in side reactions of the corresponding radical intermediates.
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