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Water as an effective additive for high-energy-density Na metal batteries? Studies in a superconcentrated ionic liquid electrolyte

journal contribution
posted on 23.04.2019, 00:00 authored by Shammi Akter Ferdousi, Matthias HilderMatthias Hilder, Andrew Basile, Haijin Zhu, Luke O'DellLuke O'Dell, D Saurel, T Rojo, M Armand, Maria ForsythMaria Forsyth, Patrick HowlettPatrick Howlett
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The effect of water on the properties of superconcentrated sodium salt solutions in ionic liquids (ILs) was investigated to design electrolytes for sodium battery applications with water as an additive. Water was added to a 50 mol % solution of NaFSI [FSI=bis(fluorosulfonyl)imide] in the ionic liquid N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI). Although the thermal properties (e.g., glass transition temperature) showed little dependence on the water content, the viscosity and, in particular, the ionic conductivity were strongly affected. The Na|Na symmetrical cell cycling performance was strongly dependent on the applied current density as well as on the water content. At higher current densities (1.0 mA cm−2) the polarization profiles showed a water dependence, suggesting that water was actively involved in the formation of an improved solid electrolyte interface layer (SEI) for high-water-content samples (1000–5000 ppm), resulting in improved long-term cycling stability. The initial impedance of cells cycled at 1.0 mA cm−2 (measured after 20 cycles) was elevated after water addition, and large polarizations occured for the “wet” samples. However, with further cycling the wet cells began to exhibit lower polarization and improved stability compared to the “dry” sample. The Na|NaFePO4 cell cycling performance was also demonstrated with minimal effect on the cell capacity, further highlighting the negligible activity of water in these electrolyte systems. In fact, reduced cell polarization and a more clearly defined charge profile were evident after water addition. The work shown here suggests that water may be used as a convenient and inexpensive additive for superconcentrated sodium IL electrolytes for improved device performance.

History

Journal

ChemSusChem

Volume

12

Issue

8

Pagination

1700 - 1711

Publisher

Wiley

Location

London, Eng.

ISSN

1864-5631

eISSN

1864-564X

Language

eng

Publication classification

C1 Refereed article in a scholarly journal