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Physicochemical and electrochemical characterisation of imidazolium based IL + GBL mixtures as electrolytes for lithium-ion batteries

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Abstract

Ionic liquid/organic solvent mixtures are investigated as potential optimal electrolytes for lithium-ion batteries (LIBs) that can combine low flammability, good thermal stability and high electrical conductivity. In this work the standard ionic association constants Image ID:c7cp04478j-t1.gif of different 1-alkyl-3-methylimidazolium ([Cnmim]+, n is the number of C in the alkyl side chain – 2, 4, 6 or 8) TFSI based ionic liquids (ILs) in γ-butyrolactone (GBL) are determined using the low concentration Chemical Model (lcCM). Based on the values of Image ID:c7cp04478j-t2.gif for ILs in GBL and earlier physicochemical systematic investigations in that solvent, the system with the lowest Image ID:c7cp04478j-t3.gif was selected for the preparation of the LiTFSI/C2mimTFSI/GBL electrolyte for testing TiO2 nanotube arrays as anode material for LIBs. In an attempt to realize LIBs with enhanced safety, we report herein a comparative study of the electrochemical properties of LiTFSI/C2mimTFSI/GBL and an electrolyte containing an IL without acidic C(2)H on the imidazolium cation, namely, LiTFSI/C2mmimTFSI/GBL. The presence of GBL can improve the reduction stability of imidazolium-based ILs and GBL in LiTFSI/IL/GBL-based electrolytes. It was shown that TiO2 nanotube structures display stable galvanostatic cycling in the LiTFSI/C2mimTFSI/GBL electrolyte after 350 full (dis-)charge cycles and after cell exposure to T = 328.15 K.

Graphical abstract: Physicochemical and electrochemical characterisation of imidazolium based IL + GBL mixtures as electrolytes for lithium-ion batteries

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Publication details

The article was received on 04 Jul 2017, accepted on 30 Sep 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP04478J
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Physicochemical and electrochemical characterisation of imidazolium based IL + GBL mixtures as electrolytes for lithium-ion batteries

    S. Papović, N. Cvjetićanin, S. Gadžurić, M. Bešter-Rogač and M. Vraneš, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP04478J

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