Methylene ethylene carbonate: Novel additive to improve the high temperature performance of lithium ion batteries

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• 作者：Dinesh Chalasani^a ; Jing Li^b ; Nicole M. Jackson^b ; Martin Payne^b ; Brett L. Lucht^a ; ^{blucht@chm.uri.edu}
• 关键词：Lithium ion battery ; Electrolytes ; Additives ; Thermal stability
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：67-73
• 文件大小：784 K

摘要

The preparation of methylene ethylene carbonate (MEC) and the incorporation of MEC into lithium ion batteries as an electrolyte additive were investigated. MEC is prepared in good yield by mercury catalyzed cyclization. Addition of low concentrations of MEC (1-2%) to 1 M LiPF₆ in 3:7 ethylene carbonate/ethyl methyl carbonate improves the capacity retention of lithium ion batteries cycled at elevated temperature (60 掳C). Ex situ surface analysis (XPS and FTIR) of the electrodes supports the presence of poly(methylene ethylene carbonate) on the anode surface. Modification of the anode solid electrolyte interphase (SEI) correlates with significant improvements in the cycling performance at 60 掳C.