Invited Presentation: Dynamic Behaviors of Phase Transition in Cathode Material

Yoshiharu Uchimoto is a professor in the Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan, a position he has since 2007.  Title of his talk is “Dynamic behaviors of phase transition in cathode material".  Time-resolved in situ analysis enables us to observe dynamic behavior occurring in an operating battery without touching its components and so actual processes associated with charging/discharging can be elucidated. The difficulty in in situ analysis has been low time resolutions, namely, it often takes long time to measure one spectrum/pattern and the status changes during the measurement has been unacceptably large. Recently the measuring probes have been much improved and observation at practical charging/discharging rate of 0.1C to 50C is now available. In his talk, application of in situ technique by using synchrotron X-ray to lithium battery analysis using their measurement characteristics are demonstrated.