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ChemComm
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COMMUNICATION
Journal Name
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221.
In sum, by reacting fluorinated alkyl pyrrolidine with CH3FSI,
the target ionic liquid 1-methyl-1-propyl-3-fluoropyrrolidinium
bis(fluorosulfonyl)imide
(PMpyrf-FSI)
and
1-methyl-1-
(2,2,3,3,3-pentafluoropropyl)pyrrolidinium
bis(fluorosulfonyl)imide (PfMpyr-FSI) were successfully
synthesized in a facile one-step reaction. The new reaction
completely eliminates the halide contamination existing in the
traditional anion metathesis method. The synthesized PMpyrf-
FSI shows high oxidation stability (> 5.5 V vs Li+/Li) as revealed
by the cyclic voltammetry and good high voltage cyclability up
to 4.7 V in NMC532/graphite full cells. Further formulation
with increased LiFSI salt concentration to 4 M has shown
increased deliverable capacity and cycling stability in both
NMC532/Li and NMCC532/graphite cells. This simplified
synthesis for functional ionic liquid opens up the opportunities
for large scale, extremely high purity, and low cost IL-based
electrolytes for safe electric vehicle application.
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Conflicts of interest
There are no conflicts to declare.
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Notes and references
‡
Corresponding author: Zhengcheng Zhang. Email:
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4 | J. Name., 2012, 00, 1-3
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