Mixtures of unsaturated imidazolium based ionic liquid and organic carbonate as electrolyte for Li-ion batteries

Room temperature ionic liquid (RTIL) 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (AMIMTFSI) was obtained with high conductivity (7.8mS/cm) and a wide electrochemical window (1–5.8V). The AMIMTFSI based electrolytes with PC have been investigated by comparison with the ionic liquid...

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Published in:Electrochimica acta 2013-04, Vol.95, p.301-307
Main Authors: Wang, Maofeng, Shan, Zhongqiang, Tian, Jianhua, Yang, Kai, Liu, Xuesheng, Liu, Haojie, Zhu, Kunlei
Format: Article
Language:English
Subjects:
1-Allyl-3-methylimidazolium
Bis(trifluoromethanesulfonyl)imide
Electrochemical impedance spectroscopy
Electrodes
Electrolytes
Electrolytic cells
Ionic liquid electrolyte
Ionic liquids
Li-ion batteries
Lithium-ion batteries
Protective
Resistance
Solvents
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cited_by cdi_FETCH-LOGICAL-c484t-946574eeb2f335125a3b34c5e3642a6d833dcc6f5b1a555e7d7a5bf80a81e80e3
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container_title Electrochimica acta
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creator Wang, Maofeng
Shan, Zhongqiang
Tian, Jianhua
Yang, Kai
Liu, Xuesheng
Liu, Haojie
Zhu, Kunlei
description Room temperature ionic liquid (RTIL) 1-allyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (AMIMTFSI) was obtained with high conductivity (7.8mS/cm) and a wide electrochemical window (1–5.8V). 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 (50wt%)–1M 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 159mAhg−1 and coulombic efficiency of 97.2% at C/20 were obtained with AMIMTFSI-PC (50wt%)–1M LiTFSI electrolyte compared to 144.2mAhg−1 and 94.5% respectively with PMIMTFSI-PC (50wt%)–1M 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% (151mAhg−1) after 100 cycles at 0.1C rate in AMIMTFSI-PC (50wt%)–1M LiTFSI electrolyte.
doi_str_mv 10.1016/j.electacta.2013.02.032
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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 (50wt%)–1M 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 159mAhg−1 and coulombic efficiency of 97.2% at C/20 were obtained with AMIMTFSI-PC (50wt%)–1M LiTFSI electrolyte compared to 144.2mAhg−1 and 94.5% respectively with PMIMTFSI-PC (50wt%)–1M LiTFSI electrolyte. EIS results indicated that a stable protective layer was formed on the electrode surface in AMIMTFSI-based electrolyte. 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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 (50wt%)–1M 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 159mAhg−1 and coulombic efficiency of 97.2% at C/20 were obtained with AMIMTFSI-PC (50wt%)–1M LiTFSI electrolyte compared to 144.2mAhg−1 and 94.5% respectively with PMIMTFSI-PC (50wt%)–1M LiTFSI electrolyte. EIS results indicated that a stable protective layer was formed on the electrode surface in AMIMTFSI-based electrolyte. 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subjects 1-Allyl-3-methylimidazolium
Bis(trifluoromethanesulfonyl)imide
Electrochemical impedance spectroscopy
Electrodes
Electrolytes
Electrolytic cells
Ionic liquid electrolyte
Ionic liquids
Li-ion batteries
Lithium-ion batteries
Protective
Resistance
Solvents
title Mixtures of unsaturated imidazolium based ionic liquid and organic carbonate as electrolyte for Li-ion batteries
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