Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 20, Pages 7606-7614Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14943a
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Funding
- U.S. Department of Energy's Office of Basic Energy Science, Division of Materials Sciences and Engineering
- ORNL's Center for Nanophase Materials Sciences (CNMS)
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
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Propylene carbonate (PC) is a good solvent for lithium ion battery applications due to its low melting point and high dielectric constant. However, PC is easily intercalated into graphite causing it to exfoliate, killing its electrochemical performance. Here we report on the synthesis of a new ionic liquid electrolyte based on partially fluorinated borate anion, 1-butyl-1,2-dimethylimidazolium bis(fluoromalonato)borate (BDMIm center dot BFMB), which can be used as an additive in 1 M LiPF6/PC electrolyte to suppress graphite exfoliation and improve cycling performance. In addition, both PC and BDMIm center dot BFMB can be used synergistically as additive to 1.0 M LiPF6/methyl isopropyl sulfone (MIPS) to dramatically improve its cycling performance. It is also found that the chemistry nature of the ionic liquids has dramatic effect on their role as additive in PC based electrolyte.
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