Modified polyolefine separators for safe Li-batteries

Abstract

This diploma thesis is focused on the lithium-ion battery system, which is frequently used today, and the modification of separators, the effect of separators used in the battery system on battery safety and performance. The increasing use of lithium batteries along with the use of electrical devices also brings safety risks if not produced as a result of sufficient engineering. These safety risks are related to the risk of heat leakage, ignition or explosion. The study presents the types and effects of separators used to increase the performance and safety of LIBs with modification. The experimental part of the study focused on evaluating the effects of the prepared separators. The morphological and surface properties of the prepared separators were analyzed and compared with SEM. Crystal structure and phase changes were analyzed with XRD and information about the performance was obtained with ionic conductivity tests. The studies have shown that the selection of separator has a great effect on battery performance and reliability and the main factors affecting these changes were determined. The study contributes to a better understanding of the importance of separators to increase the safety and performance of LIBs.