Journal
ELECTROCHIMICA ACTA
Volume 95, Issue -, Pages 301-307Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.02.032
Keywords
Li-ion batteries; Ionic liquid electrolyte; Resistance; Bis(trifluoromethanesulfonyl)imide; 1-Allyl-3-methylimidazolium
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Funding
- Ministry of Science and Technology of China [2009CB220100, 2011DFA70570-4, 2012DFG61480]
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Room temperature ionic liquid (RTIL) 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (AMIMTFSI) was obtained with high conductivity (7.8 mS/cm) and a wide electrochemical window (1-5.8 V). The AMIMTFSI based electrolytes with PC have been investigated by comparison with the ionic liquid 1-propyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (PMIMTFSI) based electrolytes. Raman observations revealed AMIMTFSI-based electrolytes achieved lower degree of [Li(TFSI)(2)](-)anionic clusters and more free Li+ charge carriers than PMIMTFSI-based electrolyte. LiFePO4 cathode with AMIMTFSI-PC (50 wt%)-1 M LiTFSI electrolyte showed the best performance in the rate charge-discharge among the binary and ternary ionic liquid based electrolytes. The first reversible capacity of 159 mAh g(-1) and coulombic efficiency of 97.2% at C/20 were obtained with AMIMTFSI-PC (50 wt%)-1 M LiTFSI electrolyte compared to 144.2 mAh g(-1) and 94.5% respectively with PMIMTFSI-PC (50 wt%)-1 M LiTFSI electrolyte. EIS results indicated that a stable protective layer was formed on the electrode surface in AMIMTFSI-based electrolyte. The layer helped to suppress the solvent decomposition and improve the cycling performance of Li-ion batteries. The Li/LiFePO4 cell showed interfacial stability and stable discharge capacities with a retention of 97.4% (151 mAh g(-1)) after 100 cycles at 0.1 C rate in AMIMTFSI-PC (50 wt%)-1 M LiTFSI electrolyte. Crown Copyright (c) 2013 Published by Elsevier Ltd. All rights reserved.
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