File(s) under permanent embargo

Beneficial effect of added water on sodium metal cycling in super concentrated ionic liquid sodium electrolytes

journal contribution
posted on 01.03.2018, 00:00 authored by Andrew Basile, Shammi Akter Ferdousi, F Makhlooghiazad, Ruhamah Yunis, Matthias HilderMatthias Hilder, Maria ForsythMaria Forsyth, Patrick HowlettPatrick Howlett
The plating and stripping performance of sodium metal in an ionic liquid electrolyte is improved when including water as an additive. Herein we report for the first time the trend of improved cycling behavior of Na0/+in N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide with 500 ppm H2O. The addition of water to this ionic liquid electrolyte promotes the breakdown of the [FSI]-anion towards beneficial SEI formation. The benefits during plating and stripping of sodium is observed as lower total polarization during symmetrical cell cycling and decreased electrode/electrolyte interface impedance. Sodium metal surfaces after cycling with 500 ppm H2O are shown to be smooth in morphology in comparison to lower additive concentrations. The outcome of adventitious moisture benefiting Na0/+cycling in an ionic liquid, contrary to conventional electrolytes, allows flexibility in ionic liquid electrolyte design to the benefit of battery manufacturers.

History

Journal

Journal of power sources

Volume

379

Pagination

344 - 349

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0378-7753

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Elsevier