Journal article
SEI Formation on Sodium Metal Electrodes in Superconcentrated Ionic Liquid Electrolytes and the Effect of Additive Water
SA Ferdousi, LA O'Dell, M Hilder, AJ Barlow, M Armand, M Forsyth, PC Howlett
ACS Applied Materials and Interfaces | AMER CHEMICAL SOC | Published : 2021
Abstract
We have previously reported that water addition (∼1000 ppm) to an N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI) superconcentrated ionic liquid electrolyte (50 mol % NaFSI) promoted the formation of a favorable solid electrolyte interphase (SEI) and resulted in enhanced cycling stability. This study reports the characterization of Na-metal anode surfaces cycled with these electrolytes containing different water concentrations (up to 5000 ppm). Morphological and spectroscopic characterization showed that water addition greatly influences the formation of the SEI and that ∼1000 ppm of water promoted the formation of an active and more uniform deposit, with larger quantitie..
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Awarded by Australian Research Council
Funding Acknowledgements
The authors acknowledge the ARC (Australian Research Council) for its financial support through the Discovery Projects funding Scheme (DP160101178). This work was performed in part at the Australian National Fabrication Facility (ANFF), a company established under the National Collaborative Research Infrastructure Strategy, through the La Trobe University Centre for Materials and Surface Science. The authors also thank Mr. John Ward for assistance with the microscopic analysis at Deakin University, Burwood.