Analysis of LLZO (Li7La3Zr2O12) Characterisation with Alumina (Al2O3) Doping for Solid Electrolyte Application on Lithium-Ion Batteries

• Main Author: Dwi Juniawan, Wismoyo
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43822
• Institution: Institut Teknologi Bandung

Lithium-Ion Batteries is one of energy storage technology used for electronic device. The main parts of lithium-ion batteries are consist of cathode, anode, and electrolyte. And the main problem of lithium-ion batteries is when the batteries used over time, the temperature rises and make the liquid electrolyte from lithium-ion batteries will less effective and it can cause several problem such as batteries leakage. To overcome this problem, safer electrolyte is needed for example solid electrolyte technology. In this experiment, we made garnet type solid electrolyte LLZO (Li7La3Zr2O12). The composition of each type solid electrolyte LLZO we made are Li7- 3xLa3Zr2AlxO12 with x variations of 0; 0,1; 0,15; 0,2; and 0,25. And the second one is Li6,25La3Zr2Al0,25O12 with Li2CO3 addition of 10%, 20%, 30%, and 40%. Powder preparations is done by conventional method by mixing, compacting with a force of 6 MT, and then calcination for 4 hours at 8500C temperature. Next is powder mixed again and compacted with a force of 6 MT, after that sintering are done for 5 hours at 11000C temperature. Pellets dimension and mass in every process are measured to find the value of relative density, densification, and %mass loss on each samples. Electrochemical Impedance Spectroscopy (EIS) test are done by Impedance Analyzer with Agilent E4980A/AL brand at room temperature and the frequency range of 20 Hz to 2 MHz. The results of EIS test were analyzed to determine the electrical characteristics of each samples. And after that sample characterization was also carried out using X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). By fitting using equivalent electric circuit model we can get the value of the highest ionic conductivity for Al2O3 doping with x = 0,25 is 1,403 x 10-5 S/cm and for the 40% lithium increasing is 4,7261 x 10-5 S/cm. Overall, the ionic conductivity will increase by the increasing of Al2O3 and also the ionic conductivity will increase by the increasing of lithium content. The highest value of densification for Al2O3 doping and increasing of lithium content respectively is 39,72% at x = 0,25 and 47,02% at 40% lithium increase.