题 目: Selenium impregnated monolithic carbons as free-standing cathodes for high volumetric energy lithium and sodium metal batteries
时 间: 2018年5月11日（周五），11点00分
地 点: 研究院大楼304A
主讲人: David Mitlin（Professor and General Electric Chair）
主持人: Mengqiang Wu（Professor）
David Mitlin is a Professor and General Electric Chair at Clarkson University, in the Department of Chemical & Biomolecular Engineering. Prior to that, Dr. Mitlin was an Assistant, Associate and full Professor at the University of Alberta, Canada. Dr. Mitlin has published over one hundred thirty peer-reviewed journal articles on various aspects of energy storage and conversion materials. He holds five granted patents three of which are licensed, and has presented over one hundred invited, keynote or plenary talks. Dr. Mitlin is an Associate Editor for Sustainable Energy and Fuels, a Royal Society of Chemistry Journal focused on renewables. Dave received a Doctorate in Materials Science from U.C. Berkeley in 2000, M.S. from Penn State in 1996, and B.S. from RPI in 1995.
Selenium–lithium (Se-Li) and selenium–sodium (Se-Na) metal systems are emerging as very attractive candidates for “next generation” batteries due to their low cost and high energy. In this work we devised a highly scalable and inexpensive method to effectively double the energy per volume of Se-Li and Se-Na cells by creating monolithic electrodes instead of the usual loosely packed nano or micro powders. Meanwhile the unique architecture based on filling the void space between carbonized cellulose allowed for excellent power and cycling characteristics, as favorable as in state-of-the-art nanostructured materials. In parallel, we performed a detailed electroanalytical study on the Se-Li vs. Se-Na systems and came to a remarkable conclusion that the two are nearly identical. This was a fully confirmed but certainly an unexpected finding, since Na diffuses much more sluggishly than Li in most other battery materials.