Double stacked interdigital polypyrrole-polyvinyl alcohol supercapacitor for compact packaging and improved capacitance performance

Research output: Contribution to journalArticle

Abstract

This paper discusses capacitance performance of flip chip double stacked micro supercapacitor structure with interwoven electrodes. The supercapacitor has stacked structure with alternating electrodes arranged vertically and laterally to one another to optimize its charging capacity. Capacitance improvements of the double stacked design are evaluated as opposed to the planar design and size reduction between the two designs are compared. The supercapacitor was fabricated by initially electroplating nickel interdigital structures onto SiO2 pre-deposited silicon substrate. The interdigital structures were then coated with polypyrrole (Ppy) before gaps between the fingers were filled with polyvinyl alcohol (PVA) as electrolyte, and a matching mirror-imaged supercapacitor structure were flipped on top of the initial structure, creating a fully encapsulated flip-chip supercapacitor. The double stacked supercapacitor design was simulated and analyzed for capacitance performance using CoventorWare ver.2008. A 20 finger pair double stacked supercapacitor cell has charging capacity of 15.5 pC, compared to 6.77 pC capacity of a planar supercapacitor of the same size. The improved capacitance performance is due to additional charging between top and bottom sets of electrodes. Thickness only slightly increases for the double stacked structure, with double stacked and planar structures are approximately 2 mm and 1 mm thick respectively. The improved capacitance performance and compact packaging of the double stacked design enables it to be utilized in more energy demanding biomedical applications.

Original languageEnglish
Pages (from-to)3151-3154
Number of pages4
JournalAdvanced Science Letters
Volume19
Issue number11
DOIs
Publication statusPublished - Nov 2013

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Polypyrrole
Polyvinyl Alcohol
Polyvinyl alcohols
Polypyrroles
Packaging
Product Packaging
Alcohol
Capacitance
alcohol
Electrodes
Fingers
electrode
Electroplating
performance
Silicon
Flip chip
Nickel
Electrode
Electrolytes
electrolyte

Keywords

  • Biomedical implants
  • Double stacked supercapacitor
  • MEMS

ASJC Scopus subject areas

  • Education
  • Health(social science)
  • Mathematics(all)
  • Energy(all)
  • Computer Science(all)
  • Environmental Science(all)
  • Engineering(all)

Cite this

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title = "Double stacked interdigital polypyrrole-polyvinyl alcohol supercapacitor for compact packaging and improved capacitance performance",
abstract = "This paper discusses capacitance performance of flip chip double stacked micro supercapacitor structure with interwoven electrodes. The supercapacitor has stacked structure with alternating electrodes arranged vertically and laterally to one another to optimize its charging capacity. Capacitance improvements of the double stacked design are evaluated as opposed to the planar design and size reduction between the two designs are compared. The supercapacitor was fabricated by initially electroplating nickel interdigital structures onto SiO2 pre-deposited silicon substrate. The interdigital structures were then coated with polypyrrole (Ppy) before gaps between the fingers were filled with polyvinyl alcohol (PVA) as electrolyte, and a matching mirror-imaged supercapacitor structure were flipped on top of the initial structure, creating a fully encapsulated flip-chip supercapacitor. The double stacked supercapacitor design was simulated and analyzed for capacitance performance using CoventorWare ver.2008. A 20 finger pair double stacked supercapacitor cell has charging capacity of 15.5 pC, compared to 6.77 pC capacity of a planar supercapacitor of the same size. The improved capacitance performance is due to additional charging between top and bottom sets of electrodes. Thickness only slightly increases for the double stacked structure, with double stacked and planar structures are approximately 2 mm and 1 mm thick respectively. The improved capacitance performance and compact packaging of the double stacked design enables it to be utilized in more energy demanding biomedical applications.",
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