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Highly Homogeneous Sodium Superoxide Growth in Na–O2 Batteries Enabled by a Hybrid Electrolyte
journal contribution
posted on 2020-02-24, 20:07 authored by Nagore Ortiz-Vitoriano, Iciar Monterrubio, Laura Garcia-Quintana, Juan Miguel López del Amo, Fangfang Chen, Teófilo Rojo, Patrick C. Howlett, Maria Forsyth, Cristina Pozo-GonzaloEnergy
storage is a major challenge for modern society, with batteries
being the prevalent technology of choice. Within this area, sodium
oxygen (Na–O2) batteries have the capability to
make a step change, thanks to their high theoretical energy density.
In order to facilitate their use, the development of electrolytes
is critical to overcome certain limitations that arise because of
the technology’s unique chemistry, particularly relating to
the stability of superoxide species. In this study, we have demonstrated
the importance of selecting a suitable electrolyte to facilitate both
a highly homogeneous distribution of the discharge products and to
minimize the formation of undesirable reaction products. The combination
of pyrrolidinium-based ionic liquid and diglyme can dramatically change
the cell performance. The effect of sodium salt concentration as well
as the amount of diglyme and N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide,
[C4mpyr][TFSI], in Na–O2 batteries has
also been comprehensively studied by combination of experimental and
simulation techniques.