Synthesis of Sodium Poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide]-co-ethylacrylate] Solid Polymer Electrolytes

Jiaye Li, Haijin Zhu, Xiaoen Wang, Michel Armand, Douglas R. Macfarlane, Maria Forsyth

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Sodium-based batteries are being considered to replace Li-based batteries for the fabrication of large-scale energy storage devices. One of the main obstacles is the lack of safe and conductive solid Na-ion electrolytes. A Na-ion polymer based on the (4-styrenesulfonyl(trifluromethylsulfonyl) imide anion, Na[STFSI], has been prepared by a radical polymerization process and its conductive properties determined. In addition, a number of multi-component polymers were synthetized by co-reaction of two monomers: Na[STFSI] and ethyl acrylate (EA) at different ratios. The structural and phase characterizations of the polymers were probed by various techniques (DSC, TGA, NMR, GPC, Raman, FTIR and Impedance spectroscopy). Comparative studies with blends of the homopolymers Na[PSTFSI] and poly(ethylacrylate) (PEA) have also been performed. The polymers are all thermally stable up to 300°C and the ionic conductivity of EA copolymers and EA blends are about 1-3 orders of magnitude higher than that of Na[PSTFSI]. The highest conductivity measured at 100°C was found for Na[PSTFSI-blend-5EA] at 7.9 × 10-9 S cm-1, despite being well below its Tg. Vibrational spectroscopy indicates interaction between Na+ and the EA carbonyl groups, with a concomitant decrease in the sulfonyl interaction, facilitating Na+ motion, as well as lowering Tg.

Original languageEnglish
Pages (from-to)232-239
Number of pages8
JournalElectrochimica Acta
StatePublished - 22 Aug 2015
Externally publishedYes


  • Electrolyte
  • Polymer
  • Sodium Battery


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