Roles of additives in the trihexyl(tetradecyl) phosphonium chloride ionic liquid electrolyte for primary mg-air cells

Yan,Y, Khoo,T, Pozo-Gonzalo,C, Hollenkamp,AF, Howlett,PC, MacFarlane,DR and Forsyth,M 2014, Roles of additives in the trihexyl(tetradecyl) phosphonium chloride ionic liquid electrolyte for primary mg-air cells, Journal of the Electrochemical Society, vol. 161, no. 6, pp. A974-A980, doi: 10.1149/2.031406jes.

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Title Roles of additives in the trihexyl(tetradecyl) phosphonium chloride ionic liquid electrolyte for primary mg-air cells
Author(s) Yan,Y
Khoo,TORCID iD for Khoo,T
Pozo-Gonzalo,CORCID iD for Pozo-Gonzalo,C
Howlett,PCORCID iD for Howlett,PC
Forsyth,MORCID iD for Forsyth,M
Journal name Journal of the Electrochemical Society
Volume number 161
Issue number 6
Start page A974
End page A980
Total pages 7
Publisher Electrochemical Society Inc.
Place of publication NJ, United States
Publication date 2014-04-29
ISSN 0013-4651
Keyword(s) Science & Technology
Physical Sciences
Materials Science, Coatings & Films
Materials Science
Summary As reported previously, water saturated trihexyl(tetradecyl)phosphonium chloride ([P6,6,6,14][Cl]) ionic liquid (IL) is a promising electrolyte for magnesium-air batteries. The added water plays an important role in enabling high rate and high efficiency Mg dissolution while stabilizing the Mg interphase. In this work, the role of the water was investigated by replacement with other additives such as toluene and tetrahydrofuran to specifically target the assumed roles of water, namely: (i) enhancement of transport properties; (ii) complexation and stabilization of the Mg anode; (iii) provision of active protons for the cathodic reaction. Discharge tests show that ethylene glycol supports comparable performance to that provided by water. Examination of the viscosity and conductivity of different [P6,6,6,14][Cl]/additive mixtures indicates that a simple consideration of solution characteristics cannot explain the observed trends. Rather, other factors, such as the presence of active protons and/or oxygen-donor groups, are also key features for the development of IL electrolytes for practical magnesium-air cells. Finally, the presence of ethylene glycol in the electrolyte results in a complex gel on the Mg interface, similar to that found in the presence of water. This may also play a role in enabling stable discharge of the Mg anode. © 2014 The Electrochemical Society.
Language eng
DOI 10.1149/2.031406jes
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
Grant ID CE0561616
Copyright notice ©2014, Electrochemical Society, Inc.
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Document type: Journal Article
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