Surface-sensitive NMR detection of the solid electrolyte interphase layer on reduced graphene oxide

Leskes, Michal and Kim, Gunwoo and Liu, Tao and Michan, Alison L. and Aussenac, Fabien and Dorffer, Patrick and Paul, Subhradip and Grey, Clare P. (2017) Surface-sensitive NMR detection of the solid electrolyte interphase layer on reduced graphene oxide. Journal of Physical Chemistry Letters, 8 (5). pp. 1078-1085. ISSN 1948-7185

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Forming a stable solid electrolyte interphase (SEI) is critical for rechargeable batteries’ performance and lifetime. Understanding its formation requires analytical techniques that provide molecular-level insight. Here, dynamic nuclear polarization (DNP) is utilized for the first time to enhance the sensitivity of solid-state NMR (ssNMR) spectroscopy to the SEI. The approach is demonstrated on reduced graphene oxide (rGO) cycled in Li-ion cells in natural abundance and 13C-enriched electrolyte solvents. Our results indicate that DNP enhances the signal of outer SEI layers, enabling detection of natural abundance 13C spectra from this component of the SEI on reasonable time frames. Furthermore, 13C-enriched electrolyte measurements at 100 K provide ample sensitivity without DNP due to the vast amount of SEI filling the rGO pores, thereby allowing differentiation of the inner and outer SEI layer composition. Developing this approach further will benefit the study of many electrode materials, equipping ssNMR with the necessary sensitivity to probe the SEI efficiently.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1021/acs.jpclett.6b02590
Depositing User: Paul, Subhradip
Date Deposited: 10 May 2017 07:57
Last Modified: 13 Oct 2017 01:04

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