Investigation of electrochemical and physical properties of commercial Li-ion battery Electrolyte

Lithium-ion batteries in the marketplace employ an organic electrolyte composed of lithium-containing salts and organic solvents. Lithium salts, such as LiPF۶, are typically dissolved in a mixture of cyclic and linear carbonate. The appropriate performance of Li-ion batteries depends on this component because it facilitates movement of ions between the cathode and the anode, stabilizes the surface of the cathode and anode, and extends the life of the battery. Different methods are needed to evaluate the suitability of the electrolyte for industrial use. Ionic conductivity, viscosity, electrochemical impedance spectroscopy and electrochemical window methods are reported for the investigation of the liquid Li-ion electrolyte. Fitted data from electrochemical impedance measurements were used to obtain internal, solid electrolyte interface, and charge transfer resistances, yielding ۲.۰۵Ω, ۲.۶Ω, and ۱۲.۰۳۵Ω, respectively. Conductivity and dynamic viscosity were measured using a conductivity meter and a ubbelohde viscometer. The electrochemical window was determined by linear sweep voltammetry and, the current begins to increase exponentially after ۴.۸ V. These techniques can be applied to characterize the liquid electrolyte of lithium ion batteries and for use in quality assurance line of battery manufacturing company