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

Leskes, Michal; Kim, Gunwoo; Liu, Tao; Michan, Alison L.; Aussenac, Fabien; Dorffer, Patrick; Paul, Subhradip; Grey, Clare P.

Authors

Michal Leskes

Gunwoo Kim

TAO LIU Tao.Liu@nottingham.ac.uk
Assistant Professor

Alison L. Michan

Fabien Aussenac

Patrick Dorffer

Clare P. Grey



Abstract

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.

Journal Article Type Article
Publication Date Feb 14, 2017
Journal Journal of Physical Chemistry Letters
Electronic ISSN 1948-7185
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 8
Issue 5
APA6 Citation Leskes, M., Kim, G., Liu, T., Michan, A. L., Aussenac, F., Dorffer, P., …Grey, C. P. (2017). Surface-sensitive NMR detection of the solid electrolyte interphase layer on reduced graphene oxide. Journal of Physical Chemistry Letters, 8(5), https://doi.org/10.1021/acs.jpclett.6b02590
DOI https://doi.org/10.1021/acs.jpclett.6b02590
Publisher URL http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b02590
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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