Imaging Sodium Dendrite Growth in All‐Solid‐State Sodium Batteries Using 23Na T2‐Weighted Magnetic Resonance Imaging. (24th November 2020)

• Record Type: Journal Article
• Authors: Rees, Gregory J.; Spencer Jolly, Dominic; Ning, Ziyang; Marrow, T. James; Pavlovskaya, Galina E.; Bruce, Peter G.
• Is Part Of: Angewandte Chemie. Volume 133:Number 4(2021)
• Page Start: 2138
• Page End: 2143
• Publication Date: 2020-11-24
• Subjects: all-solid-state electrolytes -- batteries -- magnetic resonance imaging -- NMR spectroscopy -- sodium; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202013066
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Two‐dimensional, Knight‐shifted, T 2 ‐contrasted 23 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 23 Na T 2 for the dendritic growth, compared with the bulk metal electrode, is attributed to increased sodium ion mobility in the dendrite. 23 Na T 2 ‐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. Abstract : Knight‐shift T 2 ‐weighted MRI measurements of dendrite formation in all‐solid‐state batteries show direct contrast between the bulk electrode and the dendrite formation. This significantly increased T 2 of the spalling dendrite formation is attributed to a local motion of the metallic Na ions.