期刊
JOURNAL OF POWER SOURCES
卷 234, 期 -, 页码 277-284出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.02.002
关键词
Nonaqueous electrolytes; Lithium batteries; Electrochemical stability; Cytotoxicity; Imidazolium; Pyrrolidinium
We have synthesized and determined the electrochemical and thermal stabilities of a series of 1-methyl-3-alkoxyalkyl and 1-methyl-3-fluoroalkyl imidazolium and the corresponding pyrrolidinium-based ionic liquids and estimated the cytotoxicities of representative ionic liquids. The pyrrolidinium-TFSI based ionic liquids have wide electrochemical stability (>5.7-6.2 V vs. Li/Li+) but show limited thermal stabilities and lithium cell discharge characteristics, as compared to those that are imidazolium-based (4.8-5.1 V vs. Li/Li+). The fluoroalkyl-derived ionic liquids typically have superior thermal stability (T-d > 350 degrees C) as compared to the alkoxyalkyl-substituted analogues. In all these cases, TFSI- anion-based ionic liquids are thermally and electrochemically more stable than the BF4- anion-based analogues. We have also shown that the imidazolium-based ionic liquids are relatively nontoxic and their EC50 values are comparable to their corresponding lithium salts. (c) 2013 Elsevier B.V. All rights reserved.
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