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Architectural Modifications for Flexible Supercapacitor Performance Optimization
Jari Keskinen,Suvi Lehtimäki,Arman Dastpak,Sampo Tuukkanen,Timo Flyktman,Thomas Kraft,Anna Railanmaa,Donald Lupo 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
We have developed material and architectural alternatives for flexiblesupercapacitors and investigated their effect on practical performance. The substrate alternatives include paperboard as well as variouspolyethylene terephthalate (PET) films and laminates, with aqueousNaCl electrolyte used in all devices. In all the supercapacitors, activatedcarbon is used as the active layer and graphite ink as the currentcollector, with various aluminium or copper structures applied toenhance the current collectors’ conductivity. The capacitance of thesupercapacitors was between 0.05 F and 0.58 F and their equivalentseries resistance (ESR) was from <1 Ω to 14 Ω, depending mainly on thecurrent collector structure. Furthermore, leakage current and selfdischargerates were defined and compared for the various architectures. The barrier properties of the supercapacitor encapsulation have a clearcorrelation with leakage current, as was clearly shown by the lowerleakage in devices with an aluminium barrier layer. A cycle life testshowed that after 40000 charge-discharge cycles the capacitancedecreases by less than 10%.