Ionic liquid electrolytes as a platform for rechargeable metal–air batteries: a perspective

Kar, Mega, Simons, Tristan J., Forsyth, Maria and MacFarlane, Douglas R. 2014, Ionic liquid electrolytes as a platform for rechargeable metal–air batteries: a perspective, Physical chemistry chemical physics, vol. 16, no. 35, pp. 18658-18674, doi: 10.1039/c4cp02533d.

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Title Ionic liquid electrolytes as a platform for rechargeable metal–air batteries: a perspective
Author(s) Kar, Mega
Simons, Tristan J.
Forsyth, MariaORCID iD for Forsyth, Maria
MacFarlane, Douglas R.
Journal name Physical chemistry chemical physics
Volume number 16
Issue number 35
Start page 18658
End page 18674
Total pages 17
Publisher Royal Society of Chemistry
Place of publication Cambridge, Eng.
Publication date 2014-09-21
ISSN 1463-9076
Keyword(s) Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Summary Metal-air batteries are a well-established technology that can offer high energy densities, low cost and environmental responsibility. Despite these favourable characteristics and utilisation of oxygen as the cathode reactant, these devices have been limited to primary applications, due to a number of problems that occur when the cell is recharged, including electrolyte loss and poor efficiency. Overcoming these obstacles is essential to creating a rechargeable metal-air battery that can be utilised for efficiently capturing renewable energy. Despite the first metal-air battery being created over 100 years ago, the emergence of reactive metals such as lithium has reinvigorated interest in this field. However the reactivity of some of these metals has generated a number of different philosophies regarding the electrolyte of the metal-air battery. Whilst much is already known about the anode and cathode processes in aqueous and organic electrolytes, the shortcomings of these electrolytes (i.e. volatility, instability, flammability etc.) have led some of the metal-air battery community to study room temperature ionic liquids (RTILs) as non-volatile, highly stable electrolytes that have the potential to support rechargeable metal-air battery processes. In this perspective, we discuss how some of these initial studies have demonstrated the capabilities of RTILs as metal-air battery electrolytes. We will also show that much of the long-held mechanistic knowledge of the oxygen electrode processes might not be applicable in RTIL based electrolytes, allowing for creative new solutions to the traditional irreversibility of the oxygen reduction reaction. Our understanding of key factors such as the effect of catalyst chemistry and surface structure, proton activity and interfacial reactions is still in its infancy in these novel electrolytes. In this perspective we highlight the key areas that need the attention of electrochemists and battery engineers, in order to progress the understanding of the physical and electrochemical processes in RTILs as electrolytes for the various forms of rechargeable metal-air batteries.
Language eng
DOI 10.1039/c4cp02533d
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, Royal Society of Chemistry
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