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2013 ; 4
(17
): 2970-2974
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Ether-Bond-Containing Ionic Liquids as Supercapacitor Electrolytes
#MMPMID24920995
Rennie AJ
; Sanchez-Ramirez N
; Torresi RM
; Hall PJ
J Phys Chem Lett
2013[Sep]; 4
(17
): 2970-2974
PMID24920995
show ga
Electrochemical capacitors (ECs) are electrical energy storage devices that have
the potential to be very useful in a wide range of applications, especially where
there is a large disparity between peak and average power demands. The use of
ionic liquids (ILs) as electrolytes in ECs can increase the energy density of
devices; however, the viscosity and conductivity of ILs adversely influence the
power density of the device. We present experimental results where several ILs
containing different cations have been employed as the electrolyte in cells
containing mesoporous carbon electrodes. Specifically, the behavior of ILs
containing an ether bond in an alkyl side chain are compared with those of a
similar structure and size but containing purely alkyl side chains. Using
electrochemical impedance spectroscopy and constant current cycling, we show that
the presence of the ether bond can dramatically increase the specific capacitance
and reduce device resistance. These results have the important implication that
such ILs can be used to tailor the physical properties and electrochemical
performance of IL-based electrolytes.