The Effect of Heating Rate on Li Losses from Al Stabilized Li7La3Zr2O12

Li-ion batteries are considered as the most promising candidate for energy storage systems of EV’s. However, if the range of vehicle is increased, widely used flammable and explosive electrolytes will decompose. To enhance safety for EV applications, nowadays, solid electrolytes come forward. Among them, Al stabilized cubic Li 7 La 3 Zr 2 O 12 (LLZO) shows superior electrochemical properties in terms of conductivity and stability window. During synthesis excess amount of Li must be supplied because of the volatile behavior of Li at high temperatures. The amount of excess Li is strongly dependent on heating rate during heat treatment. So, the optimization of heating rate is necessary to prevent excess Li losses. In this study, Al stabilized LLZO will be synthesized by solid state reaction method with a heating rate of 1, 2, 5 and 10 °C/min. Their thermal behavior will be evaluated with Thermal Analysis with a heating rate of up to 10 °C/min. Their crystal structures and impurity phases will be determined by X-Ray Diffraction Techniques. Scanning Electron Microscopy will be used in order to present microstructure of synthesized pellets. Their electronic conductivities will be assessed with Potentiostatic polarization method by applying 10 V.