Reza Shahbazian-Yassar

Abstract:

Among new anode materials, tin oxide, silicon, and titanate nanostructures are promising anode materials because of their energy capacity and safer performance for Li-ion batteries. The major obstacle for these new materials is the lack of scientific knowledge on the electrochemical reactions that happen inside a battery under charging and discharging conditions. This presentation focuses on the in-situ observation of lithiation and delithiation inside an aberration-corrected STEM. The electrochemical testing of these low dimensional structures was conducted inside a transmission electron microscope equipped with a novel in-situ electrical probing holder. The intercalation of Li-ions in Si and SnO2 nanorods was monitored during charging and the fracture of nanorods was quantified in terms of size. In addition, the intercalation of crystalline anatase and amorphous TiO2 was studied and their fracture events were monitored in real time.