Thursday, 23 June 2016
Riverside Center (Hyatt Regency)
In this work, the commercial titanium dioxide (TiO2) powder was used for anode material in lithium ion battery, and the traditional PVDF binder was replaced by sulfonated poly(etheretherketone) (SPEEK). The SPEEK acts as additional Li-ion conductor on the TiO2 anode, which increases the active area and enhances electrochemical performance. The traditional binder PVDF and ionic binder, SPEEK, were compared in morphology, crystal structure, and electrochemical properties. The scanning electron microscope (SEM), field emission scanning electron Microscopy (FE-SEM) and X-ray diffraction (XRD) were used to characterize the morphology and crystal structure of the anodes with different binders. Afterwards, the TiO2 anodes were packed into half cells (coin cell 2032) to understand the electrochemical properties of this composite material by cyclic voltammetry, charge-discharge, and A/C Impedance. In the initial stage of this experiment, direct coatings of TiO2 anode did not show ideal electrochemical properties. However, after the heat treatments, the performances of electrochemical properties for TiO2 anodes has optimized by applying series of temperatures (No treatment, 200oC, 300oC, and 400oC) for heat treatments. It is proved that the ionic binder, SPEEK, can replace the traditional PVDF binder. The result has shown that ionic-binder, SPEEK, can enhance the cycle life as well as the high rate performance of the TiO2 anodes. The A/C impedance test has confirms that the enhancement of electrochemical of properties is due to the reduction of charge transfer resistance by the ionic conducting SPEEK binders.