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

Literature Information

Publication Date 2017-10-02
DOI 10.1039/C7CP04478J
Impact Factor 3.676
Authors

S. Papović, N. Cvjetićanin, Slobodan Gadžurić, M. Bešter-Rogač, M. Vraneš


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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 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 for ILs in GBL and earlier physicochemical systematic investigations in that solvent, the system with the lowest 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.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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