Raphaële Clément1
University of California, Santa Barbara1
Raphaële Clément1
University of California, Santa Barbara1
Nuclear magnetic resonance (NMR) spectroscopy provides detailed insights into the working principles of ionic and mixed conductors used in rechargeable battery applications. Notably, NMR is sensitive to crystalline, disordered or even amorphous phases that arise during electrochemical cycling, and can provide atomic-level structural information, as well as insights into the dynamics of ion motion. In this talk, I will present our recent work on Li-ion and Na-ion conducting rocksalt halides [1, 2] and Li-conducting polymeric ionic liquids [2]. Using a combination of synchrotron X-ray diffraction/scattering, electrochemical impedance spectroscopy (EIS), solid-state NMR, pulsed field gradient NMR (PFG-NMR), NMR relaxometry, and first principles calculations, we provide a multiscale understanding of ion diffusion processes and link these findings to local structure features, crystallinity, and materials synthesis/processing conditions.<br/><br/>[1] <b>Sebti, E.</b>, Evans, H., Chen, H., <b>Richardson, P.</b>, <b>White, K.</b>, <b>Giovine, R.</b>, Koirala, K. P., Xu, Y., <b>Gonzalez-Correa, E.</b>, Wang, C., Brown, C., Cheetham, A., Canepa, P., <b>Clément, R.*</b>, "Stacking Faults Assist Lithium-Ion Conduction in a Halide-Based Superionic Conductor",<i> J. Am. Chem. Soc</i>., 144(13), 5795-5811 (2022). DOI:<b> </b>10.1021/jacs.1c11335.<br/>[2] <b>Sebti, E.</b>, Qi, J., <b>Richardson, P.</b>, Ridley, P., Wu, E., Banerjee, S., <b>Giovine, R.</b>, Cronk, A., Ham, S.-Y., Meng, Y. S.*, Ong, S. P.*, <b>Clément, R</b>.*, "Synthetic control of structure and conduction properties in Na-Y-Zr-Cl solid electrolytes", <i>J. Mater. Chem. A,</i> <b>10</b>, 21565-21578 (2022). DOI: 10.1039/D2TA05823E.<br/>[3] Jones, S., <b>Nguyen, H.</b>, <b>Richardson, P.</b>, Chen, Y.-Q., Wyckoff, K., Hawker, C., <b>Clément, R.</b>, Fredrickson, G., Segalman, R., "Design of Polymeric Zwitterionic Solid Electrolytes with Superionic Lithium Transport", <i>ACS Cent. Sci</i>., 8(2), 169-175 (2021). DOI: 10.1021/acscentsci.1c01260.