Journal
JOURNAL OF POWER SOURCES
Volume 194, Issue 2, Pages 1068-1074Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.05.048
Keywords
Lithium-ion battery; Room-temperature ionic liquids; Titanium oxide bronze; Thermal stability; Cathodic stability; Electrolyte decomposition
Funding
- Ministry of Education, Science and Technology [400-2008-0230]
- Research Center for Energy Conversion and Storage
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R31-2008-000-10013-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2002-0037334, 과C6A1903] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Four different electrolytes are prepared by dissolving a Li salt in three different room-temperature ionic liquids (RTILs) and also in a conventional organic solvent. The cathodic (electrochemical reduction) stability of these electrolytes is compared at both ambient and elevated temperature by potential cycling on a TiO2-B electrode. At room temperature, the stability of pyrrolidinium- and piperidinium-based RTILs is comparable with that of the carbonate-based organic solvent, which is in contrast to the severely decomposed imidazolium-based RTIL At elevated temperature (120 degrees C), the imidazolium-based RTIL undergoes even more significant cathodic decomposition that results in the deposition of a resistive surface film and leads to eventual cell degradation. By contrast, the cathodic decomposition and concomitant film deposition are not serious with pyrrolidinium- and piperidinium-based RTILs even at this high-temperature, so that the TiO2-B/Li cell operates with reasonably good cycle performance. The latter two RTILs appear to be promising solvents for lithium-ion batteries that are durable against occasional exposure to high-temperature. (C) 2009 Elsevier B.V. All rights reserved.
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