A structural investigation of organic battery anode materials by NMR crystallography

Tommy Whewell, Valerie R. Seymour, Kieran Griffiths, Nathan R. Halcovitch, Aamod V. Desai, Russell E. Morris, A. Robert Armstrong, John M. Griffin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Conjugated alkali metal dicarboxylates have recently received attention for applications as organic anode materials in lithium and sodium-ion batteries. In order to understand and optimise these materials, it is important to be able to characterise both the long-range and local aspects of the crystal structure, which may change during battery cycling. Furthermore, some materials can display polymorphism or hydration behaviour. NMR crystallography, which combines long-range crystallographic information from diffraction with local information from solid-state NMR via interpretation aided by DFT calculations, is one such approach, but this has not yet been widely applied to conjugated dicarboxylates. In this work, we evaluate the application of NMR crystallography for a set of model lithium and sodium dicarboxylate salts. We investigate the effect of different DFT geometry optimisation strategies and find that the calculated NMR parameters are not systematically affected by the choice of optimisation method, although the inclusion of dispersion correction schemes is important to accurately reproduce the experimental unit cell parameters. We also observe hydration behaviour for two of the sodium salts, and provide insight into the structure of an as-yet uncharacterised structure of sodium naphthalenedicarboxylate. This highlights the importance of sample preparation and characterisation for organic sodium-ion battery anode materials in particular.
Original languageEnglish
Number of pages15
JournalMagnetic Resonance in Chemistry
VolumeEarly View
Early online date26 Jan 2022
DOIs
Publication statusE-pub ahead of print - 26 Jan 2022

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