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

Jari Keskinen, Suvi Lehtimaki, Anna Railanmaa, Thomas Kraft, Manu Kujala, Terho Kololuoma, Matti Mantysalo, Donald Lupo

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

3 Citations (Scopus)

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 Li2SO4 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.

Original languageEnglish
Title of host publication2018 7th Electronic System-Integration Technology Conference, ESTC 2018
PublisherIEEE Institute of Electrical and Electronic Engineers
ISBN (Electronic)978-1-5386-6813-9, 978-1-5386-6814-6
ISBN (Print)978-1-5386-6815-3
DOIs
Publication statusPublished - 26 Nov 2018
MoE publication typeNot Eligible
Event7th Electronic System-Integration Technology Conference, ESTC 2018 - Westin Bellevue Hotel and Conference Center Dresden, Dresden, Germany
Duration: 18 Sep 201821 Sep 2018
Conference number: 7

Conference

Conference7th Electronic System-Integration Technology Conference, ESTC 2018
Abbreviated titleESTC 2018
CountryGermany
CityDresden
Period18/09/1821/09/18

Keywords

  • aqueous electrolyte
  • bending
  • energy storage
  • reliability
  • supercapacitor
  • voltage floating

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    Keskinen, J., Lehtimaki, S., Railanmaa, A., Kraft, T., Kujala, M., Kololuoma, T., Mantysalo, M., & Lupo, D. (2018). Lifetime and reliability of flexible aqueous supercapacitors: constant voltage floating and bending experiments. In 2018 7th Electronic System-Integration Technology Conference, ESTC 2018 [8546412] IEEE Institute of Electrical and Electronic Engineers. https://doi.org/10.1109/ESTC.2018.8546412