Professor Patrice Simon, academician of the French Academy of Sciences, visited the "Nanqiang Academic Lecture" and visited the research group

   On April 12, 2024, at the invitation of the college, Patrice Simon, an academician of the French Academy of Sciences and an outstanding professor of materials science at the Third University of Toulouse in France, visited Xiamen University and gave a guest lecture on "Nanqiang Academic Lecture" at Xiamen University. He presented a wonderful lecture titled "unraveling charge storage mechanisms in materials for High Power Batteries using Advanced Electrical Techniques" to teachers and students in the lecture hall of the Lu Jiaxi Building 202. The lecture was hosted by Professor Yang Yong, and Professor Patrick Simon was awarded the honorary plaque of "Nanqiang Academic Lecture".

   In this report, Professor Patrick Simon demonstrated how advanced electrochemical characterization techniques can help better understand the charge storage mechanism of high-power battery materials. He first introduced the study of using electrochemical quartz crystal microbalance (EQCM) and electrochemical dilatometer to track the ion flux during cation insertion in titanium disulfide (TiS2) and reduced graphene oxide (rGO) electrodes. He found that the interface effect of nanopores (porous carbon) or interlayer spacing (two-dimensional materials) led to partial solvation behavior of solvated cations, which improved the electrochemical deintercalation performance of cations in porous and layered materials. Professor Patrick Simon also introduced the in-plane impedance spectroscopy method, a novel in-situ electrochemical testing method that can measure electrode impedance during battery charging and discharging cycles, providing a new perspective for improving the stability of battery formulations and research interfaces.