Architectural Modifications for Flexible Supercapacitor Performance Optimization
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||9|
|Journal||Electronic Materials Letters|
|Early online date||2016|
|Publication status||Published - Nov 2016|
|Publication type||A1 Journal article-refereed|
We have developed material and architectural alternatives for flexible
supercapacitors and investigated their effect on practical performance.
The substrate alternatives include paperboard as well as various
polyethylene terephthalate (PET) films and laminates, with aqueous
NaCl electrolyte used in all devices. In all the supercapacitors, activated
carbon is used as the active layer and graphite ink as the current
collector, with various aluminium or copper structures applied to
enhance the current collectors’ conductivity. The capacitance of the
supercapacitors was between 0.05 F and 0.58 F and their equivalent
series resistance (ESR) was from <1 Ω to 14 Ω, depending mainly on the
current collector structure. Furthermore, leakage current and self-
discharge rates were defined and compared for the various architectures.
The barrier properties of the supercapacitor encapsulation have a clear
correlation with leakage current, as was clearly shown by the lower
leakage in devices with an aluminium barrier layer. A cycle life test
showed that after 40000 charge-discharge cycles the capacitance
decreases by less than 10%.