Speaker: Inseok Seo, Associate Professor of Advanced Materials Engineering, Jeonbuk National University
Abstract: I will talk two types of batteries. One is Li-CO2 battery and the other is all solid-state battery using oxide solid state electrolytes. Li-CO2 batteries have received wide attention owing to their high energy density and the possibility of using carbon dioxide. In this work, a highly stable and conductive NASICON-type solid electrolyte, Li1.4 Al0.4Ti1.6(PO4)3 (LATP), is used to improve the safety aspect. Also, Ru catalyst is introduced to decrease polarization, which affects to improve the battery performance. The electrochemical performance is evaluated by galvanostatic tests at a current density of 50 mA/g with a cut-off capacity of 500 mAh/g for 50 cycles.
The current usage of flammable liquid electrolytes in conventional Li-ion batteries creates risks, necessitating the development of solid electrolytes that are secure and reliable. Herein, we report the synthesis of Li1.5Al0.3Si0.2Ti1.7P2.8O12 (LASTP) powder with improved ionic conductivity and evaluate its performance as a solid electrolyte in an all-solid-state battery (ASSB). A coin cell is assembled with Li/LASTP/Li(Ni0.65Co0.15Mn0.20)O2 all-solid-state configuration to evaluate the electrochemical performance. The ASSB has shown a stable and high performance with remarkable discharge capacity of 205.3 mAh g-1 @ 0.2C. Therefore, the present work suggests that the oxide solid-electrolytes could be used for next-generation batteries.
Bio: Dr. Inseok Seo is an Associate Professor of Advanced Materials Engineering, Jeonbuk National University. He earned his B.Sc in Metallugical Engineering in 2001 from Jeonbuk National University, his M.Sc. in Materials Science and Engineering in 2003 and his Ph.D. of Materials Science and Engineering in 2009.