Abstract

Micro-scale energy storage devices are of great importance to the advancement of low maintenance, high power electronics. They can easily be used in applications that extract energy from mechanical, solar, thermal and thermoelectric sources. Several of these devices have achieved mean areal capacitance of 1.5 mF cm-2 and maximal energy and power densities of 6.6 mJ cm-2 and 44.9 mW cm-2, respectively. It has been demonstrated that a smaller interspace enhances the performance. Currently, these types of devices are only made possible by using several micro-fabrication steps and techniques that are cost prohibitive and limit the larger scale manufacturability. We present a simple but highly scalable and cost effective method in fabricating high power interdigitated micro energy storage devices using binder-free carbon nanotubes membranes and laser irradiation to obtain interspaces on the order of 75 μm. The binder-free electrode devices show higher power density and an improved frequency response, compared to what has been reported in the literature. Additionally, we observed significant reduction in cell resistance leading to enhancement in cell capacitance, and consequently, an increase in energy density.

Original languageEnglish (US)
Pages (from-to)413-418
Number of pages6
JournalMRS Advances
Volume2
Issue number7
DOIs
StatePublished - Jan 1 2017

Fingerprint

Carbon Nanotubes
Energy storage
Binders
Carbon nanotubes
capacitors
Capacitors
Capacitance
carbon nanotubes
energy storage
radiant flux density
Microfabrication
Laser beam effects
flux density
capacitance
Power electronics
Frequency response
costs
Costs
cells
Membranes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "High Power Interdigitated Carbon Nanotube Based Micro-Capacitors",
abstract = "Micro-scale energy storage devices are of great importance to the advancement of low maintenance, high power electronics. They can easily be used in applications that extract energy from mechanical, solar, thermal and thermoelectric sources. Several of these devices have achieved mean areal capacitance of 1.5 mF cm-2 and maximal energy and power densities of 6.6 mJ cm-2 and 44.9 mW cm-2, respectively. It has been demonstrated that a smaller interspace enhances the performance. Currently, these types of devices are only made possible by using several micro-fabrication steps and techniques that are cost prohibitive and limit the larger scale manufacturability. We present a simple but highly scalable and cost effective method in fabricating high power interdigitated micro energy storage devices using binder-free carbon nanotubes membranes and laser irradiation to obtain interspaces on the order of 75 μm. The binder-free electrode devices show higher power density and an improved frequency response, compared to what has been reported in the literature. Additionally, we observed significant reduction in cell resistance leading to enhancement in cell capacitance, and consequently, an increase in energy density.",
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High Power Interdigitated Carbon Nanotube Based Micro-Capacitors. / Spencer, Michael; Adu, Kofi W.; Rajagopalan, Ramakrishnan; Randall, Clive A.

In: MRS Advances, Vol. 2, No. 7, 01.01.2017, p. 413-418.

Research output: Contribution to journalArticle

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