Stable zinc cycling in novel alkoxy-ammonium based ionic liquid electrolytes

Kar, Mega, Winther-Jensen, Bjørn, Armand, Michel, Simons, Tristan J., Winther-Jensen, Orawan, Forsyth, Maria and MacFarlane, Douglas R. 2016, Stable zinc cycling in novel alkoxy-ammonium based ionic liquid electrolytes, Electrochimica Acta, vol. 188, pp. 461-471, doi: 10.1016/j.electacta.2015.12.050.

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Title Stable zinc cycling in novel alkoxy-ammonium based ionic liquid electrolytes
Author(s) Kar, Mega
Winther-Jensen, Bjørn
Armand, Michel
Simons, Tristan J.
Winther-Jensen, Orawan
Forsyth, MariaORCID iD for Forsyth, Maria
MacFarlane, Douglas R.
Journal name Electrochimica Acta
Volume number 188
Start page 461
End page 471
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-01-10
ISSN 0013-4686
Keyword(s) batteries
ionic liquids
Summary High-energy density Zinc-air batteries are currently of interest since they could play a key role in emerging large-scale energy storage applications. However, achieving good rechargeability of such metal-air batteries requires significant further research and development effort. Room Temperature Ionic liquids (RTILs) offer a number of ideal thermal and physical properties as potential electrolytes for large-scale energy storage applications and thus, can help increase the practicality of such electrochemical devices. This paper reports the synthesis and application of three novel quaternary alkoxy ammonium bis(trifluoromethylsulfonyl)amide based RTILs, with two or more ether functional groups designed to interact and solubilize zinc ions, in order to aid in the electrochemical reversibility of the metal. The anion is successfully reduced from, and re-oxidized into, the three alkoxy ammonium RTILs suggesting that they are potential candidates as electrolytes for use in zinc-air batteries. Cyclic voltammetry reveals that the presence of water reduces the activation barrier required to deposit zinc and assists stable charge/discharge cycling in an electrolyte consisting of 0.1 M Zn(NTf2)2 in the tri-alkoxy ammonium chain RTIL, [N2(20201)(20201)(20201)] [NTf2], with 2.5 wt.% H2O. Further experiments demonstrate that with such electrolyte a Zn electrode can complete at least 750 cycles at a current density of 0.1 mA/cm2 at room temperature.
Language eng
DOI 10.1016/j.electacta.2015.12.050
Field of Research 091205 Functional Materials
030604 Electrochemistry
Socio Economic Objective 850602 Energy Storage (excl. Hydrogen)
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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