PROPERTIES AND SYNTHESIS OF LI1+XALXTI2-X(PO4)3 (LATP) AS SOLID ELECTROLYTE FOR LITHIUM ION BATTERY

• Main Author: Syahman Samhan, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/48996
• Institution: Institut Teknologi Bandung

Almost all batteries in our lives are lithium ion batteries with liquid electrolyte LiPF6 which is reactive with oxygen and water, hence they have safety issue in the form of flammability. Solid electrolyte emerges as a solution for that problem. One of solid electrolyte is Li1+xAlxTi2-x(PO4)3 (LATP) which is an inorganic solid electrolyte that has NASICON (Natrium Superionic Conductor) structure. LATP is stable against water and oxygen, also has ionic conductivity more than 10-4 S/cm. This thesis contains literature study about LATP from various aspect comprehensively. First, we discuss the lithium ion conduction mechanism in LATP and the influence of its crystal structure. Second, we compare various synthesis methods which are divided into solid based and liquid based method. Third is various aspects effecting ionic conductivity of LATP. LATP development in the future as solid electrolyte in all solid state battery. Some experimental data are also written in the result and discussion section. There are designing and making hydraulic press machine, Electrochemical Impedance Spectroscopy (EIS) characterization technique for ceramic solid electrolyte, and LATP pellet synthesis. The synthesized pellet is characterized using X-Ray Diffraction (XRD) and EIS. We have successfully synthesized LATP pellet with a good crystallinity, impurity, and bulk resistance. However, the ionic conductivity is not as high as expected because of the contribution from high grain boundary resistance. The high grain boundary resistance is mainly contributed from low density of sample, with only 54,82% relative density from the theoretical density