Interfacial Chemistry and Bulk Microstructure from in-Situ Small Angle Scattering

Tuesday, 3 October 2017: 10:50
National Harbor 1 (Gaylord National Resort and Convention Center)
C. A. Bridges, X. G. Sun, C. J. Jafta, W. Heller, L. He, B. Guo, M. P. Paranthaman, and S. Dai (Oak Ridge National Laboratory)
To achieve higher energy density batteries while maintaining battery safety, better understanding is needed of processes such as solid-electrolyte interphase (SEI) formation due to electrolyte decomposition at the electrode surface. Research has historically been hindered by a lack of methods to directly probe electrochemical processes during battery cycling; more recently, several approaches have been developed to address this. We have developed a small-angle neutron scattering (SANS) based approach to observe electrochemical processes utilizing an ordered mesoporous hard carbon electrode with a high surface area that is of interest for high capacity, high power applications. The talk will present work on several electrolytes and modified electrodes examined by SANS - what has been learned about how the SEI forms and the microstructure of hard carbon electrodes changes during cycling, and what the implications are for battery design.