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Lifetime and reliability of flexible aqueous supercapacitors: constant voltage floating and bending experiments

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Details

Original languageEnglish
Title of host publication2018 7th Electronic System-Integration Technology Conference (ESTC)
PublisherIEEE
Pages1-6
Number of pages6
ISBN (Electronic)978-1-5386-6814-6
DOIs
Publication statusPublished - 2018
Publication typeA4 Article in a conference publication
EventElectronic System-Integration Technology Conference - Dresden, Germany
Duration: 18 Sep 201821 Sep 2018

Conference

ConferenceElectronic System-Integration Technology Conference
CountryGermany
CityDresden
Period18/09/1821/09/18

Abstract

We have developed thin and flexible supercapacitors that can be combined with energy harvesting components. The substrate material is a laminate foil made of polyethylene terephthalate and aluminum. Activated carbon is used as the electrode, graphite ink as the current collector and aqueous NaCl or Li 2 SO 4 as electrolyte. Constant voltage floating experiments were done to estimate the practical voltage window of aqueous supercapacitors with respect to lifetime. We measured the capacitance, equivalent series resistance, efficiency and leakage current over time at constant voltage between 0.9 and 1.6 V. The results indicate that 1.5-1.6 V is feasible for a short time, i.e. about 1-100 hours depending on the materials. Lower voltages are substantially more stable: after 2000 hours at 1.2 V the capacitance decreased by about 10 % and at 0.9 V by only ca. 3 %. Potassium iodide was tested as an additive to the aqueous electrolyte, which clearly increased (up to 3-fold) capacitance but simultaneously shortened the lifetime. The potential for scalable manufacturing of supercapacitor components by printing was demonstrated in an upscaling trial. The supercapacitors were bent to less than 1 cm minimum radius without deterioration of their electrical properties.

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