These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Li_DNP+SI_10.pdf (2.41 MB)

DNP-enhanced NMR of Lithium Dendrites: Selective Observation of the Solid–Electrolyte Interphase

revised on 25.11.2019, 13:04 and posted on 29.11.2019, 18:58 by Michael Hope, Bernadine L. D. Rinkel, Anna B. Gunnarsdottir, Katharina Marker, Svetlana Menkin, Subhradip Paul, Ivan Sergeyev, Clare P. Grey
Li metal anodes represent the ultimate energy density, but to address safety issues caused by dendrite formation, it is critical to understand the solid–electrolyte interphase (SEI) layer which forms on the metal surface. Dynamic nuclear polarisation (DNP) boosts sensitivity in NMR by harnessing the greater polarisation of unpaired electrons, however typical exogenous organic radicals are non-selective, could react with the SEI, and require cooling the sample to cryogenic temperatures. We instead exploit the inherent conduction electrons to hyperpolarise lithium metal at room temperature, utilising the Overhauser mechanism by which DNP was first discovered. This permits selective enhancement of the organic and inorganic SEI components, revealing their chemical nature and spatial distribution, via the 7Li, 1H and 19F NMR spectra.


Email Address of Submitting Author


University of Cambridge


United Kingdom

ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interest