Physicochemical properties of N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide for sodium metal battery applications

Hyungook Yoon*, Haijin Zhu, Aziliz Hervault, Michel Armand, Douglas R. MacFarlane, Maria Forsyth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

The physicochemical properties of a range of NaNTf2 (or NaTFSI) salt concentrations in N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (or C3mpyrFSI) ionic liquid were investigated by DSC, conductivity, cyclic voltammetry and diffusivity studies. Cyclic voltammetry indicated a stable sodium plating behavior with a current of 5 mA cm-2 at 25 °C to 20 mA cm-2 at 100 °C, along with high reversibility identifying this electrolyte as a possible candidate for sodium-ion or sodium metal battery applications. 23Na NMR chemical shifts and spectral linewidths (FWHM) indicate a complex coordination of the Na+ ion which is dependent on both temperature and salt concentration with an apparently stronger coordination to the NTf2 anion upon increasing the NaNTf2 concentration. Temperature dependent PFG-NMR diffusion measurements show that both FSI and NTf2 have a comparable behaviour although the smaller FSI anion is more diffusive.

Original languageEnglish
Pages (from-to)12350-12355
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number24
DOIs
StatePublished - 28 Jun 2014
Externally publishedYes

Fingerprint

Dive into the research topics of 'Physicochemical properties of N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide for sodium metal battery applications'. Together they form a unique fingerprint.

Cite this