Air-Stable,
High-Performance, Flexible Microsupercapacitor
with Patterned Ionogel Electrolyte
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Abstract
We
describe the fabrication of air-stable, high-performance, planar
microsupercapacitors (MSCs) on a flexible poly(ethylene terephthalate)
substrate with patterned ionogel electrolyte, i.e., poly(ethylene
glycol) diacrylate/1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide,
and electrodes of spray-coated multiwalled carbon nanotubes. The flexible
MSC showed good cyclability, retaining ∼80% of initial capacitance
after 30 000 cycles, and good mechanical stability down to
a bending diameter of 3 mm under compressive stress; 95% of the initial
capacitance was retained after 1000 bending cycles. The MSC had high
electrochemical stability with retaining 90% of its initial capacitance
for 8 weeks in air. Furthermore, vertical stacking of MSCs with patterned
solid film of ionogel electrolyte could increase the areal capacitance
dramatically. This flexible MSC has potential applications as an energy-storage
device in micro/nanoelectronics, without encapsulation for air stability