Public defence in Chemical Engineering, M.Sc. (Tech.) Qianyuan Qiu

Title of the thesis: Highly active catalytic cathode and selective separator for elevated temperature lithium oxygen batteries 

Doctoral student: M.Sc. (Tech.) Qianyuan Qiu
Opponent: Professor Chuan Wang, Nanjing Technology University, China
Custos: Professor Yongdan Li, Aalto University School of Chemical Engineering, Department of Chemical and Metallurgical Engineering

Highly active catalytic cathode and selective separator for elevated temperature lithium oxygen batteries

The thesis focuses on design, fabrication and characterization of highly active cathode and effective separator for the lithium oxygen batteries operating elevated temperature. The main purpose of this study is to design bifunctional catalytic cathode and effective separator for lithium oxygen batteries, develop fabrication process and prove battery performance with various characterization techniques. The study includes synthesis of perovskite LaNi0.5Co0.5O3 (LNCO) cathode, metal organic frameworks (MOF) based separator, and lithium oxygen batteries operating at elevated temperature. Different synthesis methods were applied to obtain the highly active catalyst LNCO. Batteries with LNCO cathode delivered high catalytic activities toward oxygen reduction reaction and oxygen evolution reaction during battery operation. The batteries exhibited ultra-low overall overpotential and long-term stability during cycling. The MOF based separator is proven too be feasible for lithium oxygen batteries operating at elevated temperature.

This work studies the LNCO synthesized by different method, the MOF based separator, the assembling method of lithium oxygen batteries operating elevated temperature and develop method to characterize materials and batteries. The knowledge from this work can be further used to customize catalytic cathode and effective separator for specific applications. 

Thesis available for public display 10 days prior to the defence

Contact information: 
M.Sc. (Tech.) Qianyuan Qiu
[email protected] 

Doctoral theses in the School of Chemical Engineering
Zoom Quick Guide