Electrolyte Including Additives for Lithium Secondary Battery and Lithium Secondary Battery Comprising Same
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United States of America Patent
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Nov 26, 2015
app pub date -
Jun 19, 2013
filing date -
Jun 19, 2012
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Provided is a non-aqueous electrolyte for a lithium secondary battery, which is prepared by adding predetermined additives to a non-aqueous electrolyte. The non-aqueous electrolyte includes: (a) lithium difluorophosphate, (b) an (oxalato)borate compound including one or more selected from lithium bis(oxalato)borate and lithium difluoro(oxalato)borate; and (c) fluoroethylene carbonate or a sultone based compound. The present invention provides a non-aqueous lithium secondary battery capable of having excellent low-temperature discharge efficiency and high-temperature storage efficiency while significantly decreasing a thickness increase rate of the battery at the time of being exposed to a high temperature for a long period of time.
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