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. 2017 Jan 18;139(2):595-598.
doi: 10.1021/jacs.6b11333. Epub 2017 Jan 3.

Detection of Electrochemical Reaction Products from the Sodium-Oxygen Cell with Solid-State 23Na NMR Spectroscopy

Zoë E M Reeve  1 , Christopher J Franko  1 , Kristopher J Harris  1 , Hossein Yadegari  2 , Xueliang Sun  2 , Gillian R Goward  1
Affiliations

Detection of Electrochemical Reaction Products from the Sodium-Oxygen Cell with Solid-State 23Na NMR Spectroscopy

Zoë E M Reeve et al. J Am Chem Soc. .

Abstract

23Na MAS NMR spectra of sodium-oxygen (Na-O2) cathodes reveals a combination of degradation species: newly observed sodium fluoride (NaF) and the expected sodium carbonate (Na2CO3), as well as the desired reaction product sodium peroxide (Na2O2). The initial reaction product, sodium superoxide (NaO2), is not present in a measurable quantity in the 23Na NMR spectra of the cycled electrodes. The reactivity of solid NaO2 is probed further, and NaF is found to be formed through a reaction between the electrochemically generated NaO2 and the electrode binder, polyvinylidene fluoride (PVDF). The instability of cell components in the presence of desired electrochemical reaction products is clearly problematic and bears further investigation.

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