Ether and siloxane functionalized ionic liquids and their mixtures as electrolyte for lithium-ion batteries
文献情報
Santosh N. Chavan, Aarti Tiwari, Tharamani C. Nagaiah, Debaprasad Mandal
The present study deals with an investigation of two novel imidazolium ionic liquids bearing ether–ether (1O2O2-Im-2O1) or ether–siloxane (1O2O2-Im-1SiOSi) functionalities with TFSI anion and their mixtures with propylene carbonate as electrolytes in lithium-ion batteries. The electrochemical stability and conductivity of these novel ILs were analyzed by electrochemical studies, such as cyclic voltammetry, linear sweep voltammetry and impedance measurements. The applicability of these ILs as electrolytes in Li-ion batteries was studied in the presence of a high concentration of LiTFSI (1 mol kg−1 electrolyte) and the ether–ether IL was shown to possess a high electrochemical stability window (ESW) of 5.9 V and good conductivity of 2.2 mS cm−1. The electrochemical stability and conductivity were further complimented by self-diffusion of different ions using pulsed gradient spin-echo (PGSE) NMR, viscosity and thermal properties like TGA and DSC analysis. More importantly, we explored the effect of temperature on the electrochemical stability and conductivity of these ILs by electrochemical impedance spectroscopy.
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