Two-dimensional, Knight-shifted, -contrasted Na magnetic resonance imaging (MRI) of an all-solid-state cell with a Na electrode and a ceramic electrolyte is employed to directly observe Na microstructural growth. A spalling dendritic morphology is observed and confirmed by more conventional post-mortem analysis; X-ray tomography and scanning electron microscopy. A significantly larger Na for the dendritic growth, compared with the bulk metal electrode, is attributed to increased sodium ion mobility in the dendrite. Na -contrast MRI of metallic sodium offers a clear, routine method for observing and isolating microstructural growths and can supplement the current suite of techniques utilised to analyse dendritic growth in all-solid-state cells.
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| http://dx.doi.org/10.1002/ange.202013066 | DOI Listing |
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