PhD Oral Exam - Atiyeh Nekahi, Chemical Engineering

When studying for a doctoral degree (PhD), candidates submit a thesis that provides a critical review of the current state of knowledge of the thesis subject as well as the student’s own contributions to the subject. The distinguishing criterion of doctoral graduate research is a significant and original contribution to knowledge.

Once accepted, the candidate presents the thesis orally. This oral exam is open to the public.

Abstract

In this project, a comprehensive study was conducted on LFP- and LMFP-based LIBs. Specific attention was paid to the pioneering hydrothermal and solid-state synthesis processes in the production line for olivine CAM. The synthesis parameters were investigated to achieve the best electrochemical performance, including the highest current density, energy density, and a longer cycle life. Attention was also directed toward improving the energy efficiency of LFP using LMFP. The synergistic effect of LFP/C for high electronic conductivity and LMFP/C composites was investigated for high energy density. Doping with other elements, such as Mg and Ca, was also investigated to assess their effects on the capacity and cyclability of the LFP/LMFP cathodes. Additionally, exploring zero-waste approaches was undertaken to meet the demand for battery passports and certificates. In this regard, environmental data (carbon emissions, energy use, and waste management) were collected to quantify and trace the synthesized material’s footprint on the environment. The microstructures and phases of synthesized materials, their electrochemical properties, and emissions were compared with those of commercial materials. In summary, this work encompassed the entire process, from optimizing LFP/LMFP synthesis and their electrochemical properties to addressing major application issues to advance LIB technology.